in memory daniel d. joseph

In Memory

Daniel D. Joseph

Daniel D. JosephJoseph, Daniel D. 82, of Mpls, died Tuesday, May 24 at the U of M Hospital. He was preceded in death by his son, Michael Joseph. He is survived by wife, Kathleen Jaglo Joseph; son, Charles (Alyssa), grandchildren, Shina, Dover, Levi, and Musya; daughter, Shifra Chana (David) Hendrie, grandchildren, Zalman, Chaya, Brocha, and Rina; daughter-in-law, Karen Joseph, grandchildren Samuel, Rebecca, Jacob, and Jennifer; and their mother, Ellen Hawley; son, Samuel Guillope-Weissler. Also survived by Kathleen’s sons, Michael Fogelberg (Lizbeth), grandchildren Mia and Erick; Brian Fogelberg (Jacqueline), grandchildren Adair and Jack. Dan was born in Chicago, IL March 1929. He attended Sullivan High School and earned an M.A. at the University of Chicago. He attended the Illinois Institute of Technology where he received a B.S., M.A,. and in 1963 completed a Ph.D. in Mechanical Engineering. He began his academic career in 1962 as an As-sistant Professor in ME at IIT. In 1963, he joined the faculty at the University of Minnesota in Aerospace Engineering and Mechanics Department as an Assistant Professor where he remained until his retirement in 2009. He became a full professor in 1968. He was the Russel J. Penrose Professor from 1991 through 2001 and was a Regents Professor at the University from 1994-2005. During his illustrious carer, Dan received many awards including membership in all 3 national academies: Arts & Science, Engineering, and the National Academy of Science. He was awarded the GI Taylor Medal, the Guggenheim Award, the Timosh-enko Medal plus others. He was a sought after speaker at conferences around the globe. Dan was a visiting professor in countries in Europe and Asia and an adjunct professor at the University of California Irvine. He wrote and edited books on his technical subjects and had over 300 articles published in professional journals. Dan had several patents and consulted with many companies including Pillsbury, Gilette, Her-shey’s Chocolate, and many oil companies around the world. Dan was lover of classical music, opera and the Rolling Stones. In mid life he became a marathon runner. Beside his family, a great joy was his students who are now working in North and South America, Europe and Asia. After retirement as an America’s Professor, he continued to work on his topic with a former student. The funeral and burial were held in Philadelphia, PA on Thursday, May 26. A memorial is planned for later this fall. Memorials preferred to the scholarship fund at the Institute of Technology at the University of Minnesota.

Obituary by Joseph family

Dan mistakenly picking up my raincoat and leaving his at our home just as he was returning to the USA; he remained oblivi-ous of the change-over until I was next in the USA. He was one of my earliest hosts at Minneapolis almost 50 years ago and I valued his company thereafter.

J R Anthony Pearson FRSSchlumberger Cambridge Research

Letter of Acceptance into the National Academy of Sciences

Professor Joseph signs the Academy Register of the National Academy of Sciences

Prof. Daniel Joseph – Passionate Forever

Once during a party, we discussed happiness. Prof. Joseph said that the happiest day of his life was in 1943 when Nazi Germany was defeated in Stalingrad, marking a turning point of World War II. Someone like me can only imagine the type of ecstasy that people experienced when real hope arose in one of the darkest times of human kind. Fortunately, I had the privilege to witness Prof. Joseph’s passion for academics, art, culture, and in general, life.

Prof. Joseph had an unusual path to the peak of the world of fluid mechanics. He earned his mas-ter degree in sociology at the University of Chicago in 1950. Driven by the notion that engineering would serve America better at the time, he switched to the field of mechanical engineering. Among his numerous awards and honors, he was very proud of the Distin-guished Service Award by US Army in 1992, and kept a photo of him receiving the award in uniform in the office for years.

Prof. Joseph’s competitiveness and passion for fluid mechanics never diminished. At the age of 80, he was as eager and excited to publish as ever. Once he painted his blue-print for publishing new results for me, and smiled “Why don’t we go out with fireworks?”

Opera attracted Prof. Joseph dearly. One year the DFD conference was in New York. Prof. Joseph and his wife went to the performance of Marriage of Figaro at the Metropolitan Opera, and I went to a later performance of the same opera. Before I went there, he insisted that I took his binoculars because it was not only great music but also visually beautiful. Another time I went to a movie theater to watch the live transmission of Barber of Seville by the Metropolitan Opera. During the intermission I was sitting there savoring the previous scene. Suddenly Prof. Joseph appeared in front of me and said “Jimmy, you are the youngest person in this room!”

Acquaintances of me sometimes asked why Prof. Joseph was in the Academy of Arts and Sciences. I had no answer. However I see Prof. Joseph as a man forever passionate. Isn’t that a common trait of all the great artists and scientists?

Jing WangSwiss Federal Institute of Technology Zurich

I had the occasion to meet Dan in France as well as in California. What struck me about Dan was, in addition to his theoretical side, his genuine interest in physical phenomena, for example his understanding of the be-havior of a fluid on the free surface of a porous medium. Another notable example were his remarks about what he called “lazy” liquids in two-fluid mixtures, where the more viscous one lets the other do all the work. These incontestably physical observations showed how Dan was capable of subtle reasoning, while thinking simply.

Etienne GuyonEcole supérieure de Physique et de chimie industrielles (ESPCI), Paris

Story from the Minnesota Daily, 1986

Photos from a boat tour of Antwerp during the 11th International Congress of Rheology in Belgium, August 17-21, 1992

Left to right: Joe Goddard, Dan Joseph, Kay Joseph

Left to right: Shirley Goddard (Joe’s wife), Joe Goddard, Dan Joseph, Kay Joseph

To the right are a couple of photos taken on a boat tour of Antwerp during the 11th Interna-tionalCongress of Rheology in Belgium, August 17-21, 1992 (when I was serving as President of the U.S. Society of Rheology).

We subsequently attended the International Congress on Theoretical and Applied Mechanics in Haifa, Israel, 22-28 August, 1992, and therein lies an amusing tale:

As everyone knows Dan was an avid runner but often tired himself out. Early one morning I looked out the window of my hotel room down onto the port area, and there was Dan joggingdoggedly up a very steep road from the port. Later that day, I happened to attend a technical session on the mechanics of sports, where Dan was in attendance. However, he slept soundly though several talks including, notably, a paper on the mechanics of running.

I had the great pleasure and privilege of introducing Dan on the occasion of his receiving the 1990 Taylor Medal of the Society of Engineering Science, and of conferring on him the 1993 Bingham Medal of the Society of Rheology. Those who knew Dan know that he could not suppress humorous remarks on such occasions. True to form, in his acceptance speech for the Bingham Award, he began by thanking his mother for always favoring his sister.

Another anecdote: I participated in one of the IMA workshops at the U of Minnesota orga-nized by Dan Joseph and others. I recall one day finding Dan and Prof. George (“Bud”) Homsy in one of the computer workstation labs where Bud was showing Dan the power of the Maple software for doing symbolic algebra. Bud entered a very large determinant in symbolic form, whereupon the computer promptly spewed forth a long algebraic expression for the deter-minant. Dan sat quietly for a few seconds and then murmured sadly “I want my time back”. (Anyone who has calculated determinants by hand will appreciate this.)

We will sorely miss his continuing contributions to mechanics and rheology, and especially all the fun he brought to to our labors.

Joe GoddardUniversity of California, San Diego

Clipping about Bingham Metal from Physics Today, 1994

Bingham Medal Announcement

Memorial Article by Runyuan Bai

Continued on next page

Continued from previous page


Forward: I fondly remember Professor Joseph, a Regents and Russell J. Penrose Professor of Aero-space Engineering and Mechanics at the University of Minnesota. He was also a member of the United States National Academy of Engineering, United States National Academy of Sciences, and United States National Academy of Arts and Sciences. We knew him as the “Chinese emperor” because he mentored so many Chinese students in his laboratory. We were thankful of Professor Joseph’s mentor-ing, funding, and support until graduation, and continued recommendations and support after gradu-ation. Our present success is tightly connected to Professor Joseph. After Professor Joseph’s passing on May 24, 2011, as a former student I’ve written this memorial article.

• – • – • – • – • My mentor Professor Joseph left us suddenly, without an opportunity to see him one last time. He was buried in Philadelphia, PA, near his son Mike, who preceded him in death. Professor Joseph was 82 years old.

During his lifetime, Professor Joseph often called me to discuss research on a number of experimental topics. I still subconsciously expect to receive phone calls from him. Just a few days before his death, my phone showed a missed call from him. I called him back, but no one answered. This was the last time we missed each other by phone.

In fact, Professor Joseph passed out of our lives calmly, and met death brilliantly and handsomely. He left few words behind for us, but published a huge quantity of top-quality papers that reached the peak of the international field of mechanics. He trained dozens of doctoral students who are now sci-ence and technology leaders around the world. He had no regrets, had perfect virtue, and in his own words, he was “unafraid of death.”

While we can’t resist the laws of nature, we hoped this day would come later than it did. But Profes-sor Joseph seemed to have prepared for it.

Professor Joseph is still a force in the academic world. His research engaged topics such as stability and bifurcation flow, multiphase flow, and viscoelastic and rheological aspects of fluidity. Today, research-ers in mechanics know Professor Joseph as “American citizens know Washington, French citizens know Napoleon, and Chinese citizens know the Emperor.” In addition to his membership in the Na-tional Academy of Engineering, the National Academy of Sciences, and the National Academy of Arts and Sciences, he has numerous titles and awards. He is the only professor at the University of Min-nesota to have such an honor; finding other members of the academic community of the United States with similar honors is rare. He was a Regents Professor at the University of Minnesota, was a visiting professor at the California Irvine campus, was a visiting professor at the Xi’an Jiaotong University and so on. But his honors are not so important to me. It was most important that he was my mentor, my doctoral teacher, my elder, and was one of the people to most profoundly influence my life.

I remember 20 years ago, I had gone through much effort to contact Professor Joseph about my stud-ies and my arrival at the University of Minnesota. I found out what day I would be arriving in the United States, but would first spend a night in San Francicso, the next day arrive in Minnesota, and the day after that be able to arrive at the department offices of the Department of Aerospace Engi-

Memorial Article by Runyuan Bai, translated from Chinese


Runyuan Bai and Professor Joseph in the Syncrude oil field in 1996

neering and Mechanics. Professor Joseph had a meeting out of town to during this time, and told me – with a little disappointment – that he would not be able to meet with me until the next week when he returned from his meeting. I returned to the department after he came back from his meeting, and was very excited to meet with him. However, at that time my English was not good, and I didn’t have the English vocabulary required of my research specialty, and Joseph asked me a few questions I could not answer. He was somewhat unsatisfied with this. He seemed to have very high expecta-tions for me, which became clear the first time be brought me to one of his labs and introduced me to Hu Haochuan. Hu Haochuan had completed his undergraduate degree in Zhejiang University and his master’s at Xi’an Jiaotong University, was planning to get his doctorate at Jiaotong University, but ended up traveling to the United States. Haochuan Hu was an intelligent, young, diligent student who was already familiar with Professor Joseph’s research before his arrival. He took to the lab right away and within a few days Joseph was praising his talent and gave him an English name: Howard. In the laboratory there were many students from different countries, and Joseph was busy discussing differ-ent issues with them, not paying any attention to me.

In fact, Professor Joseph was giving me an opportunity and observing me. In many cases I missed the opportunity, but I seized the opportunity several times, and this time I used the opportunity given to me my Professor Joseph. At that time there was a U.S. Department of Energy laboratory project about intermiscibility and the use of water as lubrication during transportation of crude oil, in order to achieve transmission drag reduction. The principle acts according to Joseph’s smallest energy method inference: when two immiscible fluids reach a certain shear rate, the fluid with the smaller viscosity will occupy a high-shear layer. As water has a lower viscosity than oil, its natural occupation is at the pipeline wall, where the shear rate is higher. Joseph called this phenomenon “nature’s gift.”

Joseph and his students demonstrated this theory in the situation of a stable direction of gravity. I gathered my courage and said to Joseph that, as crude oil is in the ground, only delivery from bottom to top has practical significance. From the bottom to the top levels of stability and instability should be tested, and in the establishment of an experimental device, upstream and downstream levels should also be considered.

Joseph said to me: “As long as you think it’s feasible, you own it, don’t worry about funding.” He gave me several relevant pieces of literature. I read the literature, and build a hands-on tester. I designed trial sketches, designed the spray nozzle, a pressure gauge, and recovery equipment. The pipeline was very easy to obtain, and the department also had a mechanics shop with two very knowledgeable workers. The tester was built and tested with water and, as if a miracle, the downstream direction not only proved the stability theory, the upstream “unstable” areas actually appeared as a wavy flow of bamboo surface waves, which were very regular and very beautiful. Professor Joseph was suddenly overjoyed, and was so excited he kissed my face. I photographed the experiment, wrote a report in broken English, and called this kind of wave “the bamboo wave,” in honor of the Chinese culture. Joseph re-drafted the paper and it was published in the prestigious “Nature” magazine. This was an opportunity to change my destiny. After that, Joseph began funding my graduate career. After that, he began telling everyone around him that the Chinese government gave him the two best gifts.

The next summer, Professor Joseph gave a bike each to Hu Haochuan and me. Before too long, the

bikes were stolen. Hu Haochuan, the other Chinese students in the lab, and I privately referred to Joseph as “the old man,” referring to him both as an elder and our boss.

Joseph often said to us: have fun, tell the truth, and do good research. Most of the students in the Joseph’s laboratory went through three processes: first, he ignored you, didn’t even talk to you, and it felt very unfair. After this stage, when discussing your research topic, he put much pressure on you and demanded very high levels of research. When you finally have your paper published, you sud-denly feel the benefit of it all, and he seemed very fair and amiable. Professor Joseph thought the key to mentoring students was to teach them to think independently, ask questions that had scientific significance, and develop the ability to design a good research plan to explore the issue. Although he was a mentor, he said, he was in essence a manager and organizer. When you got through these three processes and achievements, you knew he had the right to sincere gratitude.

Joseph had a liberal policy on scientific research studied in his lab, but was also very strict and didn’t tolerate errors. If a paper was published and errors were found, he repeatedly asked us to verify the mistake, and would then immediately write a special correction and an apology to the readers.

I was involved in the study of water-lubricated transportation of crude oil, only one of Joseph’s nu-merous topics. But this topic aroused the interest of the American news channel CNN as part of their coverage of science and technology. I remember the day they were recording video, and we were all very busy. Joseph had just had a tooth pulled, and his face was slightly swollen. While he was record-ing, he also made jokes with reporters, commenting on how he had to stop to adjust his facial expres-sions. Later this research was implemented in the Syncrude Canada oil field with huge success. In 1996 I visited the site with my mentor, and together we took photos with the huge oil equipment in the background.

Although Professor Joseph was a member of the three national academies and held numerous titles and awards, the only regret is that he did not receive a Nobel Prize. I remember in the early 1990s when he received an academic title and a reporter visited him to talk about his award-winning experi-ences. He told the reporter, “it’s some mistake, the judges must have gotten the name of the academi-cian wrong, my name had mistakenly been written instead of someone else’s. But I know the judges will not admit that they’ve made an error, so I’ll pick up a bargain.” The reporter looked a little appre-hensive until Joseph cracked a smile to let him in on the joke.

In the laboratory, there were often visiting scholars and professors, and we would show them our experiments. I was responsible for demonstrating the water-lubricating crude oil project. Joseph also introduced me to the visitors. The French Nobel laureate, Pierre-Gilles de Gennes, came to visit the Joseph laboratory, and I demonstrated the experiment. The Nobel Prize-winner said to me: You made a very serious mistake, you should not have called it the “bamboo wave.” He and I joked about it, as researchers in Europe and America like to name academic discoveries after themselves.

Professor Joseph and I not only had many years as a teacher and a student, but also as friends. After graduation and receiving my doctoral degree, I worked for two years doing postdoctoral research and then worked at a local scientific research company, while concurrently doing work managing Joseph’s



laboratory, often meeting with him during the weekends.

Professor Joseph was generally very happy and content, but 2002, when he was 73, was his most difficult year of life. Joseph was a workaholic, and divorced long ago because his top priority was his work. He hadn’t been a very active part of his children’s lives. In his old age, he began to regret this, and tried vigorously to compensate for it.

In 2002, his eldest son, who was the same age as me, suddenly got stomach cancer and died within a few months of his diagnosis. Joseph requested that the department send out a message to all depart-ment members to remind them not to ask him how his son was and to leave him in peace for a while to deal with the death.

I saw him in his office that day and Joseph, with tears in his eyes, said to me: Mike (his son) passed peacefully. I really regret not showing him enough love.

At that time, I saw not a professor and scholar, but a sad elderly man. It hurt my heart, and I tried to comfort him: Death is final. The Chinese have a saying called “a day as a teacher, life as a father.” Although you lost a son, you have taught so many students through the years, and they are also your sons.

He said to me, “You’re right, thank you for your comforting words. I must get back to work.” Since that year, although he continued to be a workaholic, his body was deteriorating. Later, when the laboratory updated to a newer computer, Joseph named the computer “Mike,” in honor of his son.

He and I talked about dying of old age, and I said there was a Chinese sayings about the two age ridges of the senior citizen: “73-84, Yama (Buddhist judge of the dead) has something to discuss with you.” After he heard this he laughed, and led me to his office, where on the wall there was a world age statistical charge. He pointed to a descriptive note: “If the Chinese are right, in the 73-84 age sections, the demographic data should show a dip. But the course of the chart is smooth, and the statistical data can’t lie, so what you say can’t be right.” He then said to me: “I am not afraid of death, I’m always waiting for God’s summoning. You are still young, so you must do three things: first, you must take good care of your body; second, you must take care of your reputation; third, you must take good care of your money.” After this, Professor Joseph most valued the area of scientific exploration and discov-ery. He made brilliant academic achievements, and is an honorary professor at many universities. This first began in Europe, but at the end of the century China’s reforms had opened a door for him, and Xi’an Jiaotong University and Beijing University also invited him to be an honorary professor. Ear-lier in his career he traveled frequently between the United States and Europe, and later he traveled frequently between the United States and China. He enjoyed working as a professor in China, because of the Chinese cultural tradition of respecting elders.

Professor Joseph had very careful powers of observation and extremely keen insight. On a day that he saw photos of a dust storm, he thought that if the wind blew sand and dust from far away, it must consume a great amount of energy. He wondered if there was a possibility of changing the flow field from turbulent to laminar flow, thereby reducing energy losses. He thought that China was the hard-est hit by sandstorms, and immediately contacted Peking University, Xi’an Jiaotong University, Lan-zhao University, and other research institutions about the establishment of research projects focused

on dust prevention and control. In 2007 and 2008, Xi’an Jiaotong University and Lanzhao University held relevant academic conferences on the topic. I participated in the conference at Xi’an Jiaotong Uni-versity.

Joseph’s lab had many international students, but it was self-evident that Joseph was China’s emperor, because Chinese students made up the majority. There were Chenkang Ping, Hu Haochuan (Howard), Zhang Jia Li, Bai Yuan, Liu Kangning, Ya-Dong Huang (Adam ), Ping Jingtao (Jimmy), Li Yuan Liu, Da-vid Ma, Liao Yiren (Terrence), Liu Yao Qi (JoeLiu), Huang Yijian (Peter), Wang Yi-Bing (Walter), Jiang Ling, and Wang Jing (Jimmy). He seemed particularly concerned about his Chinese students and their early studies in America, these penniless Chinese students who reached success thanks to the support of Professor Joseph, thanks to the teachings of Professor Joseph, and after graduation thanks to Professor Joseph’s recommendations and support. Today, these students are the backbone of schools and com-panies and Joseph’s name cannot be separated from their achievements and success. They are the rich fruits on Professor Joseph’s tree. Even as we left school, he was still the strong tree that we depended on. We could seek help from him if we faced difficulties, and he cared about each of his students as if we were his children.

Professor Joseph died on May 24. On the evening of May 23, Mrs. Kay Joseph was listening to music and watched the professor working, writing a letter of recommendation for a young professor, but he was obviously very tired. Kay said to Joseph: You’re old, you have poor health, in the future you must learn to say “no”. Joseph said: When I’ve finished writing this letter, then I’ll say “no”.

Halfway through the letter, he suddenly had breathing difficulties, and then fainted. Kay was shocked, and called an ambulance. On the way to the hospital, Joseph woke up, and realized this may be the end of his life. He told Kay, if this was a serious condition, don’t resuscitate him.

At the hospital they found he had a pulmonary hemorrhage, which was the reason for his difficulty in breathing, but it was not that serious as the hospital equipment could help him breath sufficiently. At the hospital, he suddenly went into heart failure. Kay told the doctors to take rescue measures, but Joseph waved them away to stop treatment.

He left as a very clear thinking human. He had no worries about money and gave what was left to his grandchildren. He was a respected scholar. He chose to let go of his life rather than become a burden to his family and live with a reduced quality of life. He said goodbye to life in a dignified manner.

Professor Joseph was a very generous gift from God. He taught at the University of Minnesota for 46 years, he published nearly 400 papers, five books, dozens of patents, and trained nearly 50 doctoral students. It can be said that he has students everywhere. His achievements helped make the aerospace engineering and mechanics department one of the best in the nation.

The greatest love of his life was his work. Before his death he said to me: I will not retire, unless God will let me retire.

Now God has given him the opportunity to rest.

Teacher Joseph, rest in peace!


Daniel D. Joseph

Daniel D. Joseph, a world-renowned expert of fluid mechanics for more than four decades, passed away on 24 May 2011 at the University of Minnesota Hospital in Minneapolis. He was Professor Emeritus and Rus-sell J. Penrose Professor Emeritus of Aerospace Engineering and Mechanics at the University of Minnesota.Dan was born on 26 March 1929 in Chicago, Illinois. He earned an M.A. Degree in Sociology from the University of Chicago in 1950, and during the next several years he worked as a semi-skilled machinist in different factories. Regarding this early experience he once jokingly said: “In those days, I was a flaming radical motivated by some mix of idealism and stupidity. I suppose the gradual realization that there was more stupidity than idealism involved led me to conclude that sociology was not my strong suit. Besides, sociology, unlike engineering, is a subject about which ordinary people think they have expert opinions, leading to a certain lack of respect”. Therefore, he went back to school at the Illinois Institute of Technol-ogy (IIT), earning his bachelor’s degree in mechanical engineering, a master’s degree in mechanics, and his Ph.D. degree in mechanical engineering in 1963.

He began his academic career during 1962 as an Assistant Professor of mechanical engineering at the Il-linois Institute of Technology (IIT). In 1963, he joined the faculty of the University of Minnesota in the Aerospace Engineering and Mechanics Department as an Assistant Professor where he remained until his retirement in 2009. He became a Full Professor in 1968 and was the Russel J. Penrose Professor from 1991 through 2001, and Regents Professor during 1994-2005. In addition, he was a Distinguished Adjunct Pro-fessor of Aerospace and Mechanical Engineering at the University of California, Irvine, and an Honorary Professor at Xi’an Jiaotong University of China.

During his illustrious career, he held 10 US patents, was author or coauthor of more than 400 journal ar-ticles and 7 books, edited 6 more books, and consulted with various companies including Pillsbury, Gillette, M&M Mars, and many petroleum companies around the world. He was a sought-after speaker at confer-ences.

At the beginning of his research career, Dan studied various fluid flows in geometries with permeable bounding surfaces. Together with Gordon Beavers, he proposed and experimentally verified a “slip” bound-ary condition at the interface of a porous medium and a clear fluid, analogous to that in a rarefied gas flow, which is referred to as the Beavers-Joseph boundary condition.

During the late sixties and early seventies, Dan’s work was more mathematically oriented. He did research on the stability of fluid motions which led to a pair of well-known monographs, and on the theory of bifur-cation which was summarized in a popular textbook on this subject written with G. Ioose. Dan is especially known for these ground-breaking works on the energy theory of stability.

In the late seventies Dan developed an interest in rheology. He advocated an approach for analyzing slow and slowly varying flows in which the flow and constitutive equations for the viscoelastic fluids are per-turbed together, independent of viscoelastic models. Together with his co-workers and using his method of domain perturbations for free-surface problems, Dan developed a theory for the Weissenberg effect governing the rise of the free surface in the neighborhood of a rod rotating in a viscoelastic fluid. He also showed how to develop a rheometer based on this phenomenon. During this period of time, Dan, work-ing with his colleagues, classified the equations of viscoelastic fluids and found that the unsteady vortic-ity equation is hyperbolic, giving rise to waves of vorticity. His research group subsequently solved many problems in which the governing equations involve a “change of type” from region of elliptic to that of hyperbolic, as in transonic flow. He also invented a device to measure the speed of a shear wave in the flu-ids, and showed that the measured speed correlated with the delayed die swell data, as well as with the tilt angle of sedimenting long particles.

In the eighties, Dan did ground-breaking experimental and theoretical work developing an understanding of the underlying physics of flow-induced particle microstructures in particulate flows. He devised simple experiments to understand the particle-scale mechanisms for these flows and came up with very-simple explanations. For example, he and co-workers noticed that in fluidized suspensions the inertial effects as-sociated with wakes are very important. They noted that particles continuously rearrange, and that in this process “Two local mechanisms are involved: drafting and kissing and tumbling into stable cross-stream ar-rays. Drafting, kissing and tumbling are rearrangement mechanisms in which one sphere is captured in the wake of the other. The kissing spheres are aligned with the stream. The streamwise alignment is massively unstable and the kissing spheres tumble into more stable cross-stream pairs of doublets which can aggregate into larger relatively-stable horizontal arrays.” Because of Dan, drafting-kissing-tumbling phenomenon has now become one of the standard test cases in the validation of direct numerical simulation techniques for particulate flows. Dan also identified that the particles falling in viscoelastic fluids draft and kiss, but instead of tumbling, they form chains along the streamwise direction.

Another project that Dan liked greatly was the water-lubricated transport of heavy viscous crude oil, in which the oil travels within a sheath of water along the pipeline, thus reducing the power required for pumping. He explained this technology in anthropomorphic terms “High viscosity liquids are lazy. Low vis-cosity liquids are the victims of the laziness of high viscosity liquids because they are easy to push around.”Dan realized that experimental tools alone were not sufficient to understand the complex physics under-lying particulate flows. He devoted the 1990s to the development of new computational approaches that could provide the details of the particle-level physics of suspension flows. In this effort he led a multi-insti-tution team to develop efficient direct numerical simulation methods that could simulate the time-depen-

Obituary from Rheology Bulletin


dent motion of large number of solid particles for sufficiently long-time durations from which the complex physics of these systems could be analyzed. He used these techniques to develop novel models for the lift force on a particle in dense suspensions, which was a hitherto difficult problem.

In the past decade, Dan worked on what he sometimes called one of his “legacy work”. While the viscous effects in an irrotational flow have been assumed to be small, Dan realized that this may not be actually so. Consequently he set out to show that this is not the case for a range of problems, and computed the er-ror that occurs because of this approximation. Many of these results are published in a book which he and his co-authors have recently published. In recent years Dan was intrigued by the problem of dispersion of small particles which disperse violently when they first come in contact with a liquid surface, and was working on the modeling of the coal gasification processes.

The hallmark of Dan’s body of work has been to pursue fundamental enquiry (he would say “pick low ly-ing fruit”) and to extract practically relevant models that can be useful in engineering practice. This led to broad impact of his work in multiple fields. He was a rare blend of a gifted mathematician and a brilliant engineer. The spectrum of prestigious awards that Dan received is a testimony to this fact. Dan received many awards including membership in three national academies: the National Academy of Engineering, the National Academy of Sciences and the American Academy of Arts and Sciences. He was a Guggenheim Fellow, and was awarded the G.I. Taylor Medal of the Society of Engineering Science, the Timoshenko Medal of the American Society of Mechanical Engineers, the Schlumberger Foundation Award, the Bing-ham Medal of the Society of Rheology, the Fluid Dynamics Prize of the American Physical Society, Profes-sional Achievement Awards from Illinois Institute of Technology and University of Illinois, and the Distin-guished Service Award from the U.S. Army.

Dan was lover of classical music, opera, and the Rolling Stones. In mid life he became a marathon run-ner. Beside his family, he took pride in the 48 students whom he directed toward a PhD and who are now working throughout the world. The principles of his laboratory were “have some fun, tell the truth, and do good research.” After retirement as a Professor, he continued to do research with his students and colleagues. The funeral and burial were held in Philadelphia, PA on 26 May 2011. Dan was preceded in death by his son, Michael Joseph. He is survived by wife Kathleen Jaglo Joseph, his sons Charles Joseph and Samuel Guillopé Weissler, his daughter Shifra Chana Hendrie, and 13 grandchildren. A memorial is planned for later this fall in Minneapolis. Memorials are preferred to the scholarship fund at the Institute of Technology at the University of Minnesota.

Written by Pushpendra Singh, Neelesh Patankar, and Howard Hu


We at UC Irvine were extremely fortunate to count Dan among our colleagues over the past five or six years. I guess he was trying to get away from the cold Minnesota winter and find refuge in balmy Southern California. I believe he found a little home away from home here. We were lucky enough to take him out to celebrate his 80th birthday and I believe he truly enjoyed it. He made a tremendous impact on several of us (faculty members and students alike). Not only did he attract us to the study of viscoelastic fluids but beyond that, he sincerely cared about our well being, not only professionally but also at a very sincere personal level. Faculty and students attended his sometimes formal and some-times informal lectures. He was willing to chat with any of us at almost any time, except of course, when was going to the gym for his regular exercise. His door was always open and he truly enjoyed passing all of his knowledge on to our students. He is very sorely missed.

Roger RangelUniversity of California, Irvine

Dan was a runner. As everyone knows he was running early mornings or at lunch time. I remember one time we were run-ning Duluth marathon. I think Oliver was there too. We were already finished and after some time, we wondered where Dan was. 5h30 later he was still not there. So we were a bit upset and started to ask at the help stations, but no news from him. Finally he arrived and said, “I was so damned slow! Some people were walking next to me and were faster than me ...!”

I think this was his last marathon; this must have been 1987. But he still kept on running of course!

Claude VerdierLaboratoire Interdisciplinaire de Physique

Professor Joseph and the attendees of his 80th birthday Symposium

80th Birthday Conference Flyer

I will always remember Prof. Joseph for many, many things. He was an incredible person in all regards.

Joe Liu3M APAC & China Region

Daniel Joseph’s election to the National Academy of Sciences occurred at the right time – while he’s still around to savor it.

“Sometimes people, when they give you congratula-tions, say, ‘This is an honor that has long been over-due.’ And that makes me a little bit angry, because I’m just glad it happened before I died,” said Joseph, a professor of aerospace engineering and mechanics at the University.

Joseph’s pre-posthumous selection by the academy comes 28 years after joining the University faculty. He has since earned a reputation worldwide as one of United States’ leading researchers in the areas of fluid mechanics and the theory of stability.

The National Academy of Sciences acknowledged Joseph’s work by electing him a member May 1. The academy honors excellence in all areas of science, and members advise Congress on various scientific and technological developments.

The academy also elected Ronald Phillips, a profes-sor of agronomy and plant genetics, as a member, bringing the total number of University faculty in the academy to 16.

Joseph, 62, said he was “really, really pleased” by the academy’s selection.

“I just know it to be a great honor,” he said. “I have many colleagues – that this University even, cer-tainly in the country – who I regard as good as or better than me that aren’t members.”

William Garrard, associate head of the aerospace en-gineering and mechanics department, said election to the academy “is a very great honor. It’s national recognition among your peers that you’ve done out-standing work.”

Joseph’s ideas and ardor make him an effective

teacher and researcher, Garrard said.

“He’s a very creative individual. That’s one thing that sets him apart…He’s got a lot of insights, a lot of enthusiasm,” Garrard said.

Joseph called his success “historically accidental.”

Born and raised in Chicago, Joseph garnered a soci-ology degree at the University of Chicago in 1950. He planned to stop his education there. But the in-creased efforts of the United States to catch up with the Soviets in the space race of the 1960s changed his mind.

Fellowships and teaching positions opened at schools across the country as the United States began emphasizing space technology in response to the Soviet’s launching of satellites in the early 1960s. Joseph, already intrigued by engineering, decided becoming a professor would jibe with his affinity for research.

“I certainly didn’t go into teaching because I had some kind of noble desire to do a good job with the youth – that I did not have,” Joseph said.

“(Teaching) seemed like a good job, the pay was good enough, the prestige was good enough and I liked ideas and I liked to study. So…”

So, he renewed his education at the Illinois Insti-tute of Technology, earning three science-related degrees, culminated by a doctorate in mechanical engineering in 1963.

Later that year, Joseph came to the University of Minnesota to teach and research aerospace engi-neering and mechanics. His writings about fluid mechanics and the theory of stability in the ensuing years have, for one, improved methods for transfer-ring oil in pipelines.

“Say you have crude oil, a very viscous substance, and you pump it out of the ground and you have to get it to a ship or refinery,” Joseph said.

“You can’t really pump (crude oil) in a pipeline be-cause it’s too viscous. Well, it turns out if you inject water into the pipeline, the water will automatically migrate to the outside of the line and lubricate the flow, so that the oil just slides right by in a sleeve of water.”

Aside from deciphering the intricacies of lubrication and fluid flow, Joseph has learned to enjoy teaching.

“I have the attitude that the best thing that I can contribute is not so much the glory of my research discoveries but that I’ve had a fair number of very good students. If you educate a young person that has a lot of talent to do things in the future, you’ve really added something to the world,” he said.

John Nelson, a graduate student in aerospace engi-neering and mechanics, said Joseph allows students “a little independence.”

“He has a good way of handling students,” Nelson said. “He points them in the right direction, but he hangs back enough to make them feel like they’re doing the work. He lets you be creative on your own.”

Colleagues also admire Joseph’s relationship with students.

“One thing that makes him unique,” said Ted Wil-son, an aerospace engineering and mechanics pro-fessor, “is his ability to bring graduate students into the research of fluid mechanics. He’s got a very enthusiastic, close-knit group.”

Joseph said he stresses to students the need for na-iveté when researching a project.

“I teach my students to be naïve and to try to look freshly at things without prejudice and to let their curiosity and wonderment take hold of them,” he said.

Joseph said he hopes to work for a few more years. His fifth book is due out in late 1991, and yet he downplays his academic accomplishments.

“Maybe what I could say is that what we’ve wit-nessed is the successful outcome of a historical ac-cident. I really feel that,” he said.

The National Academy of Sciences will induct Jo-seph and Phillips at its annual meeting next spring.

By Martin KuzStaff Reporter

Story from the Minnesota Daily, 1991U prof find as much reward in teaching as in research

We began the collaboration with Prof. Joseph since 2004. He was invited to become a Honorary Professor here in our University by Prof. Liejin Guo and visited our Lab quite often. We really feel very sad for his death.

Bin ChenXi’an Jaiotong University

65th Birthday Conference Program

Q&A from the University of Minnesota Research Review, 1991


Memories of Dan Joseph

It is an honor to share some special thoughts and memories of Dan. We first met in the late1980s when I was working on polymeric filament flows. My research until then was in nonlinear waves and integrable equations. However, my first attempts to pub-lish what were perceived as “mathematical” approaches to thin filament equations were greeted by hostile referees. I happened to have a conversation with Dan about how an-ti-intellectual these reviews were, simply because we were using different approaches to derive, solve and interpret new model equations. I had plenty of cool problems to keep myself entertained and that were viewed as acceptable in the mathematics and applied mathematics culture. Dan sensed that I was about to walk away from viscoelastic fluid mechanics, and he went out of his way to encourage me to continue to work in this area, and to emphasize his view that the field needed more mathematical approaches and insights. Almost 25 years later, I remain heavily invested in all things viscoelastic and non-Newtonian. Without Dan’s encouragement and nurturing of my work with Steve Bechtel, neither we nor the graduate students and postdocs I have mentored would be involved in these research areas that Dan was so passionate about. He not only paved the way for rigorous insights into viscoelastic fluid mechanics with his analysis and experiments, Dan was a tireless advocate for interdisciplinarity before it was a household word. It was my good fortune to have known Dan and to benefit from his generosity and enthusiasm, and from the many encounters which were always highlighted by an infectious smile.

Greg ForestUNC Chapel Hill

Congratulation Letter from University President Hasselmo

Regents’ Professorship Plaque

The Regents Professor position was established in 1965 by the Board of Regents to recognize the national and international prominence of faculty members. It serves as the highest recognition for faculty who have made unique contributions to the quality of the University of Minnesota through exceptional accomplishments in teaching, research and scholarship or cre-ative work, and contributions to the public good.

From the inception of the Regents Professorship program, the University of Minnesota Foundation has underwritten a stipend for each Regents Profes-sor. The stipend is currently $50,000 annually, with $20,000 dedicated to a salary augmentation and $30,000 dedicated to a discretionary research fund. This is an indication of the importance the University of MinnesotaFoundation attaches to the program.

Nominees must show evidence of scholarly achievement, excellence in teaching and advising, and professionally related service inside and outside the University.

- from the University of Minnesota Awards & Honors web page

Regents’ Professorship Overview

Professor Joseph after receiving a metal in recognition of academic distinction from the Regents of the University of Minnesota.

Workshop on Multicomponent and Multiphase Fluid Dynamics (In Honor of Professor D.D. Joseph on his 70th Birthday)Alumni Hall, Towne Building, University of Pennsylvania

Friday, March 12, 1999

8:00-9:00 Registration9:00-9:20 Welcoming (Dean E. Glandt, Provost R. Barchi, Chairman J. Bassani)

Session Chair: Howard Hu, University of Pennsylvania9:20-10:10 Daniel D. Joseph, University of Minnesota “Drop breakup in a shock tube at ultra high Weber numbers”10:10-11:00 Grigory I. Barenblatt, University of California, Berkeley “Thin film extension along a solid surface – three phase flow with challenging contact line boundary conditions”11:00-11:20 Break

Session Chair: John Bassani, University of Pennsylvania11:20-11:40 Jerry P. Gollub, Haverford College “Phase coexistence in granular fluids”11:40-12:00 Sidney Leibovich, Cornell University “Transport of oil spilled in the ocean”12:00-12:20 James P. Brill, University of Tulsa “Paraffin deposition in multiphase pipelines”12:20-2:00 Lunch at Weightman Hall, Donaldson Room (2nd Floor), 235 S. 33rd St.

Session Chair: Pedro Ponte Castañeda, University of Pennsylvania2-2:50 G. Paolo Galdi, University of Pittsburgh “Sedimentation of slow particles in Newtonian and second-order fluids”2:50-3:40 L.S. Fan, Ohio State University “Dynamics of high pressure gas-liquid-solid fluidization”3:40-4:10 Break

Session Chair: Haim Bau, University of Pennsylvania4:10-4:30 Andras Z. Szeri, University of Delaware “Coolant flow in grinding”4:30-4:50 Geraldo S. Ribeiro, PETROBRAS/CENPES, Brazil “Displacement of a heavy oil frozen inside a duct by light oil”4:50-5:10 Vivek Sarin, Purdue University “A preconditioned linear system solver for a 2-D particle mover”5:10-5:30 Arjan Kamp, PDVSA Intevep, Venezuela “Two-phase flow of foamy heavy crude oil in porous media”5:30-5:50 Martin Maxey, Brown University “Approximate dynamic-coupling models for particle-laden flows”

7:00-8:30 Reception (Sheraton University City Hotel at 36th & Chestnut Streets)Organizing Committee: John Bassani, University of Pennsylvania Jimmy Feng, CCNY, New York G. Paolo Galdi, University of Pittsburgh Howard H. Hu, University of PennsylvaniaLocal Contacts: Howard Hu: 215-898-8504, [email protected] Delores Magobet: 215-898-2770, [email protected]

Saturday, March 13, 1999

Session Chair: Sergio Turteltaub, University of Pennsylvania9:00-9:50 Roland Glowinski, University of Houston “A wave-like equation method for the treatment of the advection in incompressible viscous flow models–application to particulate flow”9:50-10:40 John F. Brady, California Institute of Technology “Simulation of colloidal dispersions”10:40-11:00 Break

Session Chair: Ira M. Cohen, University of Pennsylvania11:00-11:20 Howard Brenner, Massachusetts Institute of Technology “Enhanced heat- and mass-transport rates induced by laminar chaos in convective-diffusive systems”11:20-11:40 Jimmy Feng, City College of CUNY “The fluid dynamics of nematic polymers: a fusion of continuum mechanics and molecular modeling”11:40-12:00 Claude Verdier, C.N.R.S., France “Coalescence in polymer emulsions”12:00-12:20 David Rumschitzki, City College of CUNY “Convective and absolute instability of a two-fluid jet ”12:20-2:00 Lunch Break

Session Chair: Stuart W. Churchill, University of Pennsylvania2-2:20 Andreas Acrivos, City College of CUNY “Shear-induced particle diffusion in concentrated suspensions. Some recent and partially unexplained results”2:20-2:40 M. Gregory Forest, University of North Carolina at Chapel Hill “A framework for defects and textures in flows of liquid crystal polymers”2:40-3:10 K.R. Sreenivasan, Yale University “Polymer action in turbulent flows”3:10-3:30 Michel Cloitre, CNRS, France, “Flow structuration in concentrated colloidal pastes”3:30-4:00 Break

Session Chair: Jimmy Feng, City College of CUNY4:00-4:20 Yuriko Renardy, Virginia Polytechnic Institute and State University “Numerical simulation of two-layer Couette flow and core-annular flow”4:20-4:40 Amitabh Narain, Michigan Technological University “Computational simulation and flow physics for annular/stratified condensing flows”4:40-5:00 Cyrus Aidun, Georgia Institute of Technology “Dynamical behavior of suspended particles in shear and confined sedimentation”5:00-5:20 Gustavo Núñez & Clara Mata, PDVSA Intevep, Venezuela “Sedimentation of highly concentrated oil in water emulsions”5:20-5:40 Anne Robertson, University of Pittsburgh “Flows of second order fluids in curved pipes: effects of second normal stress coefficient”5:40-6:00 Pushpendra Singh, New Jersey Institute of Technology “Direct numerical simulation of multiphase flows”

7:00-10:00 Reception and Dinner (University of Pennsylvania Museum, 33rd and Spruce St.)

Sponsored by: The National Science Foundation, The Air Products Foundation, School of Engineering and Applied Science and Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania.

70th Birthday Workshop Schedule

Daniel D. Joseph was invited for the first time to the Université of Paris 11 (Orsay) by Roger Temam, director of the Laboratoire d’Analyse Numérique, in the year 1980-81. During the subse-quent 10 to 15 years, he was regularly invited to France or elsewhere in Europe, so that he visited Paris very often. His favorite place to stay in Paris was the Parisiana Hotel, run by two elderly women, and located near rue Mouffetard in the 5th arrondissement of Paris, right in the heart of the Latin quarter.

It was this visit in 1981 in France which started the research in Orsay in the mathematics of viscoelastic fluid flows. His very first paper with Jean-Claude Saut on “fading memory” appeared in the Arch. Rat. Mech. Anal. in 1983. For the next 15 years or so, there were regular workshops on viscoelastic fluids organized in Orsay and elsewhere in France. A group of doctoral students in this area was established in Orsay and as these students became professionals, the area of research became more important in France and around the French speaking countries in the world.

On May 17-18 1989, we organized an international meeting in Orsay in the honor of Daniel D. Joseph’s 60th birthday. There were speakers in mathematics as well as in physics. Among the speakers, there were the mathematicians Jean-Michel Coron, Edward Fraenkel, Paolo Galdi, Gé-rard Iooss, Kurt Kirchgässner, Roger Temam, and among the physicists, Friedrich H. Busse, Pierre Coullet, Etienne Guyon, Roland Ribotta and Eduardo Wesfreid.

Etienne Guyon, then director of the Palais de la Découverte in Paris, said “J’accepte volontiers de participer à une manifestation en l’honneur de Daniel D. Joseph que j’aime beaucoup”. ( “I gladly accept to participate in an event in honor of Daniel D. Joseph , whom I like a great deal”). When Daniel D. Joseph came to Paris, he would also visit the group of de Gennes - Guyon at the ESPCI (Ecole supérieure de physique-chimie Paris), where he would enjoy looking at fluid flow experi-ments and discussing them.

- Colette Guillopé Formerly of the Université Paris 11, now at the Université Paris-Est Créteil &Jean-Claude SautUniversité Paris 11, Orsay

Attendees of conference in Orsay in honor of Dan Joseph’s 60th birthday. From left: Oscar Manley (deceased), Roger Temam, Ciprian Foias, Jean-Michel Coron, Daniel D. Joseph, Jean-Claude Saut, Genviève Raugel, Eduardo Weisfred, unknown, Colette Guillopé, Gérard Iooss, unknown, Danièle Le Meur (secretary), Edward Fraenkel.

Press Release about Timoshenko Medal

In my instructions about the correct behavior of recipi-ents of the Timoshenko Medal at this dinner, Tom Cruse wrote to me that “While I ask that you consider the hour and the length of the evening in selecting the length of your remarks, the time is yours and we are honored to hear from you at that time.” This suggests to me that as a Timoshenko Medalist, I can be indulged but that if I re-ally want to be appreciated, I should keep it short.

I understand that when Jerry Ericksen got this award, he said “thank you” and sat down. I would like to follow this courageous path, but I lack the courage and so I will embellish “thank you” just a little.

Of course, I am pleased and honored to get the Timosh-enko Medal and I am especially pleased to be introduced by my teacher and dear friend, Phil Hodge. I got my Ph.D. in 1963 at the Illinois Institute of Technology in Chicago. My advisor was L.N. Tao, but I took a graduate course in continuum mechanics with Phil when I was anundergraduate. It was a very demanding and quite un-usual course with an emphasis on mathematical rigor at a level at which beginning students in engineering could understand. The course had a very important and perma-nent influence on my understanding of the mathematics of mechanics which influences me still.

At the University of Minnesota, Phil and I were running buddies. We even ran some marathons together; that is, we started together, then I saw his backside for a few minutes and three or four hours later, I could find him well rested at the finish. I ran 22 marathons; my best time for all of them was 3:42. In that marathon, Phil did it in 3:16 and was No. 1 in his old age group. My mara-thon running is like my career; not much talent, but very persistent. It is good for me that the Timoshenko Medal is also given to tortoises.

Applied mechanics was very strong at IIT in the early 1960’s. The late Peter Chiarulli and Max Frocht were there then, and Eli Sternberg had been there not so much earlier. Another applied mechanician, Walter Jaunzemis, taught us a very thoughtful course on analytical dynam-ics which I appreciated greatly. He died as a young man. It is so sad to think of these ghosts of my past. My friend, Ronald Rivlin, who thank God is still alive and feisty,

told me on the occasion of my 60th birthday that I was too old to die young. This is actually some comfort. It might interest you that Barenblatt and I are editing a col-lected works of Rivlin which ought to appear next year.

My relations with the people of applied mechanics de-veloped more strongly at IIT than later. Peter Chiarulli arranged for me to present some work I did about Stokes flow over a porous sphere at an ASME meeting in a ses-sion chaired by George Carrier. He introduced me as Dr. Joseph. I wasn’t a Dr., but George didn’t know it. Later, he told me that he always played it safe. A little later, he saved me from later embarrassment by rejecting that paper. Too many mediocre papers were published in the 1960’s and 1970’s.

Jim Rice noted already in his acceptance speech of last year that the early 1960’s was possi¬bly the best time to get a Ph.D. in mechanics ever. Due to Sputnik, there was lots of money for fel¬lowships, new faculty positions and research. I certainly benefited from this; I got a good job eas¬ily at the University of Minnesota in 1963 and my career advanced very fast. One consequence of the atmosphere of the time was to put a bigger than usual emphasis on foundations at the expense of applications. Many engineers in those days had an exaggerated idea of the power of abstract approaches. Mathematicians, and physicists too, have a good sense of the history of their subject. They know their heroes and who to emulate. We have not this sense of history in engineering and it leaves us rudderless and prey to foreign influences like those which, in the 1960’s and 70’s, led to the unnatural attempt to axiomatize mechanics.

It is probable that in recent times the pendulum has swung too far against abstract approaches based in math-ematics in a kind of overreaction which generally accom-panies the correction of abuses.

My career can also be understood in two phases, the first emphasizing mathematics and the second, engineering. Actually, I could point to a third phase—the sociology phase, which came first. Some of you may know that I got a master’s degree in sociology from the University of Chicago in 1950. Even though I have a master’s degree in this field, I don’t get much respect. The problem is that

no matter how well educated you may be in sociology, the man on the street has his own opinion. Engineers are much better off because they get the benefit of the doubt.

Probably only a few of you know why I got this medal. Some years ago, when I had no honors and awards but Jerry Ericksen had many, I noticed that to get them, you needed to be certified. I told Jerry that the best kind of certification is that you have already got some honors and awards from elsewhere. Jerry then noted that “every dog knows where other dogs pee.”

Joking aside, I owe so much to the string of superb students who have worked with me in these past years: Luigi Preziosi, KangPing Chen, Howard Hu, Pushpen-dra Singh, Adam Huang, Runyuan Bai, Jimmy Feng, Todd Hesla, Mike Arney, Joe Liu, Geraldo Ribeiro, Chris Christodoulou, Oliver Riccius, Joe Than, P. Huang and many others. These students worked with me on many projects; here, I will mention two: Hyperbolicity and change of type in the flow of viscoelastic fluids and the water-lubricated pipelining of heavy crudes.

In the 1980’s, together with Michael Renardy and Jean Claude Saut, I found that the unsteady vorticity equation for many models of viscoelastic fluid is hyperbolic, giving rise to waves of vorticity. In steady flows, the vorticity field can be of one type here and another there, as in transonic flow. The other variables, stresses and veloci-ties, are neither strictly hyperbolic and/or strictly elliptic. To me, it is surprising that with so much mathematical work coming from rational mechanics in the 1960’s, 70’s and 80’s, that the problem of the mathematical classifica-tion of type of the governing PDE’s was not joined.

The key quantity in the discussion of hyperbolic waves of vorticity is the speed of shear waves. We invented a device in 1986 to measure the speed of these waves. We must have measured these speeds in 200 different fluids by now. There are over 100 values published in my 1990 book on the Fluid Dynamics of Viscoelastic Liquids. You can compute a relaxation time for these speeds, and usu-ally it is an order of magnitude smaller than what other people get by the devices they use. I think that conven-tional rheometers have a too slow response, most of the signal has decayed by the time those instruments kick in.

Using speeds measured on my device, I have correlated data from our experiments on delayed die swell, the orientational change of falling bodies, the change in the drag law of air bubbles rising in viscoelastic fluids and other anomalous effects that were reported in experi-ments, which I interpret as a change of type. If you use the speed we measure, you get a good agreement, but not otherwise.

I must confess that the rheology community, though not hostile, seems largely indifferent to these results which I consider to be so important.

Another topic on which we have worked, which I like greatly, is water-lubricated pipelining of heavy oils. It is a gift of nature that if you put water and oil into a pipeline, and the oil is viscous enough, say, greater than 5 poise, the water will go to the walls of the pipe where it lubricates the flow. You can get drag reductions this way of the order of the viscosity ratio. Crude oils with a viscosity of 1,000 poise are not uncommon. They can’t be pushed through pipes at that viscosity, but with water there, they go through easily. You’ve got drag reductions of the order of thousands. This is a technology which has been used and it will be used more and more.

CNN found out about our work on this and did a short video segment on it which I am going to show you. That week, I had a tooth pulled and my face was swollen. Just my luck to have a swollen face on the road to stardom.

I have been asked many times if the lubrication of one fluid by another can be described by a variational prin-ciple. Strictly speaking, it cannot; however there is something in the idea of minimum dissipation which is best expressed in anthropomorphic terms. “High viscos-ity liquids are lazy. Low viscosity liquids are the victims of the laziness of high viscosity liquids because they are easy to push around.”

1995 Timoshenko Medal Lecture by Daniel D. Joseph

D.D.Joseph visited Nice Sophia-Antipolis University and Ecole des Mines de Paris several times during the preceding de-cades and I appreciated all the nice discus-sions we had at that time.

Jean-François AgassantMines-Paristech in Sophia-Antipolis

Professor Joseph and his research group.

Obituary from the Minneapolis Star Tribune

Daniel Joseph, 82, distinguished U professorHe was elected to three prestigious academic societies, but it was his students that he

cherished, his wife said.

Daniel Joseph was one of the University of Minnesota’s most decorated professors. He was globally recog-nized as a master of fluid mechanics, a complex field that uses mathematics to analyze how fluids interact. He devised better ways to move oil through a pipeline and ink through a ballpoint pen.

But he was proudest of the scores of graduate students he mentored who now work around the world. He kept their pictures pinned to his office wall. His medals and awards were tossed in the drawer.

“He used to say, ‘Without [the students] I’d be nothing,’” said his wife, Kathleen, of Minneapolis. “He was always devoted to his students. And his students were devoted to him.”

Joseph, 82, died May 24 of cardiac arrest at the University of Minnesota Medical Center in Minneapolis. He had been retired for only a couple years, after concluding a brilliant 46-year career at Minnesota.

Joseph was a big reason why the school’s aerospace engineering program and research rank among the best in the world, said Gary Balas, head of the aerospace engineering and mechanics department.

“Dan was always 10 years ahead of the field, looking at areas and thinking about things that were going to change before they started to change,” Balas said.

In the early 1990s, Joseph had the rare honor of election to three prestigious academic societies: the Na-tional Academy of Engineering, the American Academy of Arts and Sciences and the National Academy of Sciences.

The news of his election to the latter came on his answering machine, and he asked a colleague to listen to make sure he heard it right. “I thought I might be dreaming,” he said.

A Chicago native, Joseph got a sociology degree from the University of Chicago before deciding that me-chanical engineering would be a better fit. He returned to school at the Illinois Institute of Technology and received his Ph.D in 1963.

He soon was hired by the U and quickly rose through the ranks, becoming a full professor in 1968. In 1994, he was named regents’ professor.

Joseph was a visiting professor in several countries, including England, Italy, France, Australia and Israel.

He wrote five books and more than 300 articles for professional journals. In addition, he held at least 10 patents and consulted for governments and private companies.

In 1991, Joseph worked with the Venezuelan government on the problem of moving heavy crude oil through a pipeline. His answer: Use water to form a tube within the pipe, through which oil could flow.

A lover of classical music and opera, he often worked out to the Rolling Stones. When he quit smoking in midlife, Joseph became a dedicated marathoner and ran a half-marathon as recently as eight years ago.

One dark winter morning in 1990, Balas came out of his university office to find Joseph, wearing ear-phones, charging down the hall at him. He was training for a marathon.

“It’s my favorite memory of Dan,” he said.

Besides his wife, Joseph is survived by sons Charles of Clifton, N.J., and Samuel Guillope-Weissler, of Paris; daughter Shifra Chana Hendrie, of Morristown, N.J.; and 13 grandchildren. Services were held May 26 in Philadelphia. A memorial is being planned this fall at the University of Minnesota.

Kevin Duchschere • 612-673-4455

I knew of Dan’s death very late and by chance. It was certainly my fault since I have not been remained too much in contact with him after 1993 when I was visiting him in Minneapolis for his 65th birthday. That one was a wonderful meeting and a great occasion to spend some moments with one of the best scientists I ever met.

Most of all I know about fluid dynamics comes from his books, lessons and private communications. He was a great teacher and researcher and I’ll miss him enormously. There are many moments of my friendship with him during my stay in Minneapolis more that 30 years ago that I remember well. Many were serious, others funny, oth-ers potentially dangerous, like when we made a trip to Madison for a meeting. He was driving his car with me on the side seat. We were talking about a research topic and Dan was so concentrated in the modeling problems that he did not put too much attention towards the speed limit. So he didn’t realize he was driving at almost 100 miles/h on the highway to Madison when fortunately I addressed his attention toa highway panel saying “The state of Wisconsin do arrest drunk drivers and speeders”!Fortunately we were not drunk and we started to laugh commenting how lucky we were to be there free and not in jail.

Fabio RossoUniversita di Firenze

The beginning and the end - A short summer story

I’d like to share with you all a story about an event that happened to me this summer. This is represented in the accompanying photo.

In the morning of August 29 of this year 2011, the gentle-man on the right knocked at my door here in the office of 311 Akerman Hall and introduced himself as Dr. Tsun Fu. He asked about Prof. Daniel Joseph. I told him about Prof. Joseph’s recent passing and, of course, he became saddened by the news. He obviously didn’t know about it. He told me that he was traveling from California to visit old friends living in the Twin Cities, and the University of Minnesota, where he obtained a PhD in our Department. He graduated in 1967 and his advisor was, who else, Professor Daniel Joseph. He told me that he was one of the first PhD graduates of Professor Joseph. I was astonished be-cause of the unexpected encounter. So, here we were, the last PhD graduate of Professor Joseph (me) standing next to one of the very first. He received his degree in 1967 and I in 2010. Quite rapidly, and after introducing myself, I picked my camera and asked the friend of Dr. Tsu, who was accompanying him during his visit, to capture the moment in a photo.

Several days later, his friend told me in a short message that after graduation, Dr. Tsu worked at company based in Los Angeles until his retirement. I found his Dissertation in the library. Its title is “Viscous instability of asymmetrical parallel flows in channels”. There, he also acknowl-edges the help of Professors William Meecham and Thomas Lundgren.

I think this is a perfect opportunity to share this photo with you. Hopefully, you will find the moment represented in it as interesting as I do. To me, this photo is a testimony of the endur-ance of Prof. Joseph’s fingerprint as a mentor and teacher on various generations of scientists and engineers. With these memories, we recognize and honor this legacy.

Juan C. Padrino Minneapolis, MNNovember 4, 2011

Photos from Memorial Symposium

Attendees of the symposiumRow 1 (from left): Ellen Longmire, Kang Ping Chen, Geraldo Ribeiro, Colette Guillope, Perry Leo, Runyuan Bai, Mike ArneyRow 2: Krishnan Mahesh, Katepalli Sreenivasan, Hans Weinberger, Tom Lundgren, Clara Mata, Barbara Lundgren, Kay Joseph, Ling Jiang, Louise Pope, Toshio Funada, Valjean D’Amour, Ephraim SparrowRow 3: Howard Hu, Gustavo Nunez, Dave Hultman, Karen Hesla, Todd Hesla, Pushpendra Singh, Bill D’Amour, Jurgen Sanders

Mike Arney speaks during the symposium

Kay Joseph and Toshio Funada during symposium break

Attendees at symposium -Howard Hu (left) and Pushpendra Singh (right) standing

Congratulation Letter from Provost Infante

In this difficult time, I take great comfort in the many fond memories that I have of my long friendship with Dan Joseph. He was an exceptionally accomplished fluid me-chanics researcher who embodied the ideal of a scholar at the highest level. His work was extraordinarily theoretical and yet impressively also practical and pragmatic, with substantial benefits for industry. His intellectual curiosity and creativity that led to his many groundbreaking publications made him the most admirable researcher world-wide in the field. However, I was always stuck by, and will always, remember Dan’s warmth and generosity as both a scholar and a friend. In spite of his many accom-plishments and recognitions he always remained very humble and was ready to be of assistance to anyone, particularly young people, through support, encouragement, and his willingness to share his ample knowledge and experience.

Dan was a giant as an educator, mentor and researcher and he will continue to be an enormous inspiration to me.

L.-S. Fan, Ph.D.The Ohio State University

Newspaper clipping about National Academy of Science Election

I was very sad to learn of the death of Dan Joseph. I worked with Dan and ran mara-thons with him during visits to UM of six months each in 1975 and 1981. One of the jokes that we shared was that “Daniel D” also spells “D. A. Nield”.

Don NieldUniversity of Auckland

Dan Joseph: a Good Friend

Dan was a first-class friend and a first-class professional colleague throughout my career at the Univer-sity. We joined the Department of Aeronautics and Engineering Mechanics (as it was named then) on the same day in 1963 and worked together on-and-off for the first twenty years. I then spent about a decade in administration, (of which Dan often expressed his disapproval!), and on my returning to academic pur-suits worked very closely with Dan for about ten years on a program on aerodynamic breakup that we both found to be lots of fun.

Dan was a brilliant ideas-man in our collaborations. He always had a good feeling for what could be done in a laboratory experiment, and then left me alone to do it. He was always much more excited about the outcome of an experiment than me – I was more relieved that the experiment had eventually worked out O.K. A perfect example of this enthusiasm of Dan’s occurred a few months after we had first set up a lab for work on non-Newtonian fluids, when some simple experiments produced exciting results, which led Dan one day to name the place “The Lab of Lucky Breaks”, and he had a sign with that name posted in the lab.

Dan was often overly-generous in assigning me credit on many of our joint papers – I always thought that he did the hard parts! Our first paper together was the “Beavers-Joseph Boundary Condition” – the names should have been reversed but he wouldn’t hear of it. He always seemed to find it amusing the number of times that little paper was cited; one of the last brief conversations I had with him was when he called me to tell me the latest number! When working on a paper he was always totally dedicated to getting it fin-ished so I would get occasional telephone calls at all hours of the day or night.

We were always good friends outside the lab. In our very early years we lived close by, and occasionally Dan would bring his family over for a picnic at my house. I admired him for his dedication to running in marathon races, particularly after witnessing his first attempt at running. When we joined the University he was an over-weight pipe smoker. One day he decided to go with me to run around the old football sta-dium. The most he could do was a couple of laps of walking/jogging. It wasn’t so long before he was a seri-ous runner and then a marathon runner. That was typical Dan – he never did anything in half measures.

Running was an essential part of his every-day life. I remember once going to a meeting with Dan at a military lab, where they wanted to start the meetings at the crack of dawn. Dan refused to do anything un-til he had had his morning run! We were at a meeting in Capri for a week in the 1980’s and every morning he would drag me out to run with him on a very hilly course. He almost wrecked my knees!

Dan and Charles Michael, Charles, Karen, Ellen, Dan

In his marathon-running days he was so enthusiastic about running that he even designed a T-shirt for run-ners in the Aero Department.

In later years we often ate lunch with Tom Lundgren in my office, where Dan quickly turned the conversa-tion to politics and the performance of the stock market. He was never slow in expressing his opinions on literature and world events.

Dan had a big impact on the careers of many people, including mine, for which I am greatly indebted. I feel it an honor to have my name linked in a small way with his.

Gordon BeaversOctober 25, 2011

Mark AhrensNicholas Richa BaumannRobert Ma EberDengfeng JiangLing JiangU LeiChihhsiung LiuP. MohrAmitabh NarainJohn Jay NelsonDouglas OcandoEdmond Joseph Odonovan

Raimundo Pardo VazquezGilberto Antonio PenaArmando Pereira HormaecheaDavid John RiebeDanut SimaConstantinos SioutasTravis Allan SmiejaCarolyn Dewald StelterFlavia VianaYibing WangBilly WilliamsJiali Zhang

Arezoo ArdekaniMichael Scott ArneyRunyuan BaiYilmaz BayazitShlomo CarmiKangping ChenT. S. ChenChristodoulos ChristodoulouSadegh DabiriPrakash M. DixitJingtao FengAntonio Francisco FortesTsun Sen FuJose Lopez GuitianVed P. GuptaSkjalg HaalandTimothy J. HallTodd Inman HeslaLinda Kay HeuerHoward H. HuIng-Tzong HuangYa Dong HuangYi Jian HuangLiang Ying HungTaehwan KoYijen Liao

Yaoqi J LiuClara Eugenia MataJulian E. MottBruce R. MunsonAmitabh NarainKy Thanh NguyenJuan Carlos Padrino InciarteLuigi PreziosiRam Mohan RaoGeraldo Afonso Spinel RibeiroOliver RicciusJurgen SandersChing-Cheng ShirAydeniz SiginerPushpendra SinghLeroy D. SturgesWann-Joe SunJohn Frederick Swigart Phuong Trong ThanAnh Hao TieuSteven Arman TrogdonClaude VerdierHarry Maia VinagreJing WangHaoping YangJung Yul Yoo

Professor Joseph’s students

Master’s Students

PhD Students

Professor Joseph impacted many lives, especially through his work as an adviser and mentor to graduate students. He worked with students both in Aerospace Engineering and Mechanics and in other depart-ments in the College of Science and Engineering. Professor Joseph took great pride in his students and his legacy will live on through their accomplishments. Among them include:

Professor Joseph with some of his researchers and graduate students.

in memory daniel d. joseph

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