2010 Nastran Users ConferenceTorino, Italy

Lance ProctorSr. Product Manager, Nastran

MSC Software

AGENDA

• Nastran Evolution

• Nastran Today

• Nastran Tomorrow

10/8/2010 2

Nastran Evolution

Evolving Nastran

MultiMulti--Discipline / MultiDiscipline / Multi--Scale Optimization (SOL400)Scale Optimization (SOL400)

FE Optimization (SOL 200)

Structures /Mechanical

Thermal Dynamics/Aero, …

Adv NLAdv NL(Marc, (Marc, Dytran)Dytran)

MBSMBSServiceService

ClassicNastran

1980 thru

19901990 thru

20002000 thru

20052005 thru

20092009+

Basic Basic NLNL

PointSolutions

ExchangeExcitations

ExchangeEnvironment

ExchangeAttributes

Full EventSimulation

Chaining Level I Chaining Level II Coupled

MD Framework (solver integration, 3MD Framework (solver integration, 3rdrd party integration, scripting)party integration, scripting)

MDIntegration

Pattern

Micro-failure integration tMG PAA integration NAI Sinda integration nCode integration

Implicit NL IntegrationImplicit NL IntegrationExplicitExplicit--Implicit NL IntegrationImplicit NL Integration

NL Post-Buckling Optimization

Nastran Today

MD Nastran 2010

SimXpert Renewed Patran

OpenFSI

Coupled Thermal-Mechanical Optimization

Chained Thermal-MechanicalMulti Model Optimization

Robust ContactStructural, Thermal, Segment

BOLT modeling

Nonlinear Completeness (SOL 400)

10/8/2010

Contact Improvements• Thermal Contact• Segment to Segment Contact for

Solids & Shells

CFD, Thermal and FSI• OpenFSI with User Defined

Services• RC Network Integration

Elements and Materials• Nonlinear Element Offsets• Incompressible 2D Triangular and

3D Tetrahedral Elements• Through the thickness heat

variation in Shell Elements• Axisymmetric Shell Elements• Automated Bolt Modeling

Optimization, Durability and NVH

10/8/2010

Optimization• Multi-Model Optimization (MultiOpt)• Monitor Point Support• Parts Optimization• NL Optimization (ESL) Extensions.• Parallel Sensitivities• DTABLE/DTABLE2 enhancements• Topology and Topometry

Enhancements

Durability and NVH• Connector Enhancements• Frequency Dependant Rigid

Absorber• Test-Based FRF for Frequency

Based Assembly (FBA)• Single FRF Component in FBA• EFEA / EBEA (pre release)

Implicit and Explicit Nonlinear

10/8/2010

Implicit Nonlinear (SOL 600)

• Multi-axis brake squeal• Contact friction vs time• Conversion of CHEXA and CEPNTA to solid

shell• RSSCON, RSPLINE• Contact and Materials user subroutines• Stiffness Matrices in Output4 and Boeing

Hartwell formats• NLELAST types 2-6• Arbitrary Cross Section and Numerically

Integrated Beams• Option to choose between secant and

instantaneous CTE’s• Segment to segment contact (Phase 1)• MUMPS and Pardiso solvers

Explicit Nonlinear (SOL 700)

• SOL700 DMP FSI with Multi-Material Euler – ROE Solver– Graded Mesh– Failed elements in coupling surface– Biased meshing– Coupling surface output and markers– Geometric boundary conditions– Viscosity

• Advanced Composites based on AlphaStar –GENOA technology

• New shrink tight fit contact feature• New material models • Variable Plasticity Damage Model (MSU)• Upgraded LS-Dyna Libraries to v4.2.1 • Upgraded MPICH 1 to MPICH 2 for Windows• De-activation of Eulerian elements during

simulation • Optimization in load balancing and

performance

MD Nastran 2010 – Other Enhancements

• Parts and Loads Management– PAA Integration (TMG Technology – Demonstrator)

– Loads Management Scripting (Pre Release)

• Aeroelasticity– Apply pressures to Aero Mesh

– Output results in CSV format– Output trimmed Loads

Coupled Thermal-Mechanical Analysis

• Description– Coupled Thermal-Mechanical Analysis

in MD Nastran SOL400• Thermal strains• Structural properties are temperature

dependent• Thermal Loads due to plastic work• Thermal loads due to friction• Thermal Contact

• How did you do it before?– Not available in MD Nastran

• Why is it better?– More Accurate– Mechanical contribution to thermal problem is

included– Thermal Problem utilizes change in geometry– Easier to use.

12

Coupled Thermal-Mechanical• SimXpert Support

Directional heat load 30 Watt/in^2Radiation to space

dirheat-simx1.dat

Thermal Contact

• Description– Contact capabilities are extended to support thermal

contact in SOL400• Steady-State Heat Transfer• Transient Heat Transfer• Coupled Thermal-Mechanical

– Ability to model true contact and close behavior– Supports Nodal Based Friction with Heat Generation

• How did you do it before?– Heat Transfer across boundaries required a

congruent mesh

• Why is it better?– Dramatically increases efficiency in modeling time– Can more easily build assembly models and swap

‘parts’ for what if studies

14

Thermal Contact• SimXpert Support

Coupled Thermal-Mechanical with Frictional Heating

• Description– Combines coupled thermal-

mechanical with thermal and mechanical contact

– Frictional heating

• How did you do it before?– Available through Marc

• Why is it better?– Ability to simulate complex systems

with frictional heating

17

Contact Enhancements

• Segment–to–segment contact– 2-D & 3-D for linear and quadratic elements– Improved accuracy providing a better stress

continuity in the contact region.

• How did you do it before?– Node to Segment

• Why is it better?– Improved Accuracy– Full shell thickness “footprint”– Shell can connect on both sides– Fewer contact parameters compared to the

node-to-segment algorithm

Node to Segment

Segment to Segment

Full Bending Continuity –glued contact

Contact Enhancements - SimXpert support

Contact Enhancements

• Description– Rigid Body Growth

• How Did you do it before– Available only in Marc

• Applications– Simulating stent growth through expansion of

stent internal surface by growing the rigid body with time increment

– Manufacturing simulations

Flat Pattern

Stent Analysis – SimXpert Support

Stent Roll-up Template

GROW Contact

Body

OpenFSITM Example

• Aerospace Flutter• ha145e adapted to OpenFSI

ha145_OpenFSI.dat Animations Courtesy Acusim

Data Sent:• Welted Surface Mesh

• Displacements

Data Received :• Nodal Forces

STRUCTURES SERVICE

Data Received :• Displacements/Velocities

on Structural Mesh

Data Sent :• Forces on Structural Mesh

CFDSERVICE

(Mapping performed by CFD Code in 2010)

Simulation Component Architecture

OpenFSITM – SimXpert Support

Analysis Chaining and Perturbation

• Description– Extension of SOL400 Chaining and Perturbation

Solutions for comprehensive set of analyses• Nonlinear static analysis• Nonlinear transient analysis• Linear static analysis• Normal modes analysis• Direct complex eigenvalue analysis• Model complex eigenvalue analysis• Brake squeal analysis• Steady state heat transfer analysis• Transient heat transfer analysis• Direct Frequency Response• Modal Frequency Response• Modal Transient Response

• How did you do it before?– Manual restart and multiple runs

• Why is it better?– Easy to use, automated job run– Single MD platform (SOL400)

23

Nonlinear Static Deflection with 3D ContactNew

Element Offsets for Beams and Shells

• Description– Shell and beam offsets for linear and nonlinear

analysis– Offset incorporated at the element level

• How did you do it before?– Rigid bars at each GRID

• Why is it better?– Enhances all linear solutions (103, 105, etc.)

• Address differential stiffness limitation– Sol 400 enhanced for Nonlinear Element Offset– Better CAD integration and Optimization

support

24

Automated Bolt Modeling

• Description– Automatic calculation of preload

• How did you do it before?– Split mesh– MPC’s– Remove MPC Grids from Contact region

• Why is it better?– “BOLT” entry - Automatic MPCs– Continuous contact on bolt shaft– General method for pre-stressing, available for

all element types (solids, shells, beams)

25

Automated Bolt Modeling - SimXpert support

Nonlinear Incompressible Elements

• Description– Addition of Lower order for incompressible

material modeling.– 4-Node Tetrahedral, 3 Node Plane Strain,

3 Node Axisymmetric – Enables the ability to model Rubber and

Plasticity

• How did you do it before?– Required Quadrilateral or Hex meshing

or higher order elements

• Why is it better?– Improved Accuracy– Reduced Lock-Up and convergence

issues– Extends material and element library

27

Connector EnhancementAuxiliary Grid Output, CSEAM stress

• Project Summary– Extend CFAST/CWELD DISP(CONN) to Freq Response, Transient– Add CSEAM DISP(CONN) for auxiliary GRIDs

• Statics, Modes, Frequency, Transient– Stress Recovery for CSEAM– CWELD coordinate system

• How did you do it before?– Not available

• Why is it better?– User can display displacement pattern of CWELD, CFAST, CSEAM– CSEAM stress data recovery– Familiar interface

• DISP=ALL, VEL=ALL• DISP(CONNECTOR=m)=n

28

Monitor Points in Dynamic Solutions

• Description– Extend Monitor Points to Dynamic Solutions

• SOL 108, 109, 111, 112

• How did you do it before?– Previously available in SOL 101, 103, 144 & 145

– DMAP alter for transient, or not available

• Why is it better?– Monitor point output is now available in dynamic solutions

• Load Summations• Element Results• V, M, T at a section• Averaged displacements

29

Available in SOL 200Static and SAERO

Equivalent Radiated Power (ERP) MDR3.1

• Project Summary– Surface Radiated Sound Power

• How did you do it before?– Spreadsheet, external program

• Why is it better?– No need to maintain external program– Convenient CSV output– Approximates panel participation factors in

structure-only model• No need to compute acoustic responses

30

GRID~350KSHELL~350K

Test-Based FRF

• Description– Capability to include Test-based FRF parts

to the FRF and FBA functionality has been added

• How did you do it before?– This level of integration with test data was

not available.

• Why is it better?– Structures difficult to characterize analytically

can be characterized with test data.

31MD Nastran only

Energy Finite Element Analysis

• Description– High Frequency Acoustic Analysis using

Energy Methods

• How did you do it before?– SEA methods

• Why is it better?– No frequency limit

– Excellent correlation to test

Conventional FEA

EFEA - Structures

EFEA - Acoustics

Transmission Loss

10

20

30

40

50

60

70

80

90

100 1000 10000

Frequency (Hz)

TL

(dB

)

Test (Case 1)Test (Case 2)Test (Case 3)Test (Case 4)Test (Case 5)EFEA (Case 1)EFEA (Case 2)EFEA (Case 3)EFEA (Case 4)EFEA (Case 5)

MD Nastran only

Pre Release

MD Nastran MultiOpt

Multi-Model OptimizationMultiOpt (MD 2010)• Description

– Disparate models capture appropriate physics for each discipline

– Merge design variables and sensitivities into coherent numeric design model

– Optimize and return info to each model

• How did you do it before?– Combine individual Optimization runs

• Why is it better?– No longer need to iterate between

design groups

– Model re-use for optimization

– Better design when considering all disciplines rather than merging separate optimization runs.

Automated synthesis of complete design space using appropriate models for each

physics discipline

Common Data = Design Variables

33

Full Vehicle NVH: – 5.0M dof / 50 design var– Analysis = MFREQ (w ACMS)

Example: Multi-Model NVH + Stress + Structure

Trim Body Stress: – 4.6M dof / 47 design var– Analysis = STATICS (Inertia Relief)

Gauge Thickness Discrete Optimization

BIW Stiffness:– 2.8M dof / 31 design var– Analysis = MODES (w Modtrak)

Objective (Min Wt)

-60

-40

-20

0

0 1 2 3 3D

Cycle #

Del

ta W

t (lb

)

53.5 lb wt reduction (full vehicle model)

34

(representative models)

Nonlinear Response Optimization (Pre-Release)

• Description– Extend Equivalent Static Loads – Nonlinear Response

Optimization: ESLNRO

• Add SPCF response• Add Topology

• Add Contact

• How did you do it before?– Previously only Large Displacement and Material

Nonlinearity– Previously only Displacement or Stress responses

• Why is it better?– More nonlinearities considered

– Leverages the existing SOL400 and SOL200 capabilities

– Efficient alternative to RSM Methods

35

Topology Optimization with Contact

Proposed Shape – Linear Analysis

Proposed Shape - ESLNRO

Courtesy Saab

↑Stiffness 18.6%

Adaptive Load-Stepping: NLSTEP

• Description– New and robust adaptive load step

algorithm NLSTEP– Provides a new adaptive load stepping

procedure

• How you did it before?– NLPARM, TSTEPNL, NLADAPT– Trial and error settings

• Why is it better?– More robust and efficient algorithm– Automatic time stepping

36

Improved Performance of Contact Models

• Description– Improved SOL 400 performance with CASI solver

– Over 50% improvement observed in runtime and number of cycles

• How did you do it before?– Direct Solver

• Why is it better?– Better performance through increased efficiency

• No matrix assembly required• Contact support

• Lower Memory Footprint

37

s1

Slide 37

s1 Addded this sentencestahi; 17/05/2010

DMP for SOL 400; improved SMP

• Description– Implement Nastran DMP solvers in SOL 400 (and SOL 101 Linear Contact)– Enable model partitioning methods– Enable existing sparse direct and iterative DMP solvers

• Why is it better?– Increased throughput – Parallel scalability

• Application– Large Nonlinear Shell Element Models– CASI serial is still recommended for solid models

38

Parallel Processing“SMP Parallel greatly reduced the turn-around time by about 2x on a range of large problems”- Julien Rodes, Study Engineer, Sogeti

SOL 700 Parallel Fluid Structure Interaction (FSI)

• Description– Distributed Memory Parallel for FSI

applications includes the support for Multi-Material Euler

• How did you do it before?– Previously, only Single Material Euler. FSI

applications had to be run on single processors

• Why is it better?– The FSI applications are extremely CPU

intensive. By using the DMP FSI, the performance is dramatically improved by using multiple processors

39

1cpu-FSIDMP 2cpu-FSIDMP 4cpu-FSIDMP 8cpu-FSIDMP

Total time [sec] 1407 961 616 369

Speedup wrt 1 cpu-FSIDMP 100.00% 146.41% 228.41% 381.30%

0

200

400

600

800

1000

1200

1400

1600

What are Customers Saying about MD 2010?

Explicit SOL700“Using MD-Nastran SOL700 for simulation of buried mine blasts under armored vehicles. We have verified the ability to run a large model including complex fully coupled fluid-structure interaction on multiple CPUs. The parallel processing capability has dramatically reduced solution time .”- Gary Bailey, Nevada Automotive Test Center (NATC)

1cpu 2cpu 4cpu 8cpu 16cpu 32 cpu

Total time (seconds) 45624 27689 17175 10787 6261 5079

Speed up wrt 1cpu 100.00% 164.77% 265.64% 422.95% 728.70% 898.29%

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

SOL 700 Composite Progressive Failure Analysis with AlphaSTAR• Description

– MD Nastran calls AlphaSTAR PFA Module for each layer for each element– Analysis set up and run in MD Nastran environment– Damage reflected as modified stiffness and element removal– Takes full advantage of MD Nastran capabilities and AlphaSTAR micromechanics

• Why is it Better?– Up to 6 different materials

• Fiber Matrix• Ply• Isotropic• Orthotropic Foam• Isotropic Foam• Honeycomb

– Up to 24 different Failure Criteria• Maximum Stress/Strain• Failure theory• Honeycomb

41

MD NastranDocumentation overhaul

Level 1

Consolidate Existing Docs

Level 2

Update / New User Guides

Level 3

Generate New User Guides

Level 4

Generate New Theory Manual

Sustaining Activities (updates)

Time

Increasing Complexity, Skill Level, or Effort

Documentation Updates

• Nastran 2010 Overhaul– Getting Started User Guide (V2001)– Dynamics User Guide (V68,V70)– Linear Static User Guide (V2003)– Design Sensitivity & Optimization Guide (V2005, V2007)

• MD Nastran 2010 New– EFEA User’s Guide– EFEA Tutorial– EBEA User’s Guide– PAA User’s Guide– Load Management User’s Guide

• MD Nastran 2010 Sustaining Updates– MD Demonstration Problems– Release Guide– Installation and Operations Guide– Quick Ref Guide– MD Explicit Nonlinear Users Guide– User Defined Services Guide

Updated MD Demonstration Problems(formerly MD User Guide)• 17 New Application Example

– 73 total in-depth examples with input files

• 43 chapters have streaming “How To” videos – Total duration ~13 hours

– Longer videos have bookmarks– Activate video content within PDF

• 14 chapters have SimXpert tutorial slides

• Every chapter contains: – One page summary

– Associated input files downloadable by clicking on file name

• New Appendix: “Getting Started in SimXpert”

• Current Document on Scribd.Com– Individual chapters being posted

– Option to download or view online– http://www.scribd.com/doc/33463596/MD-Nastran-Demonstration-Problems-2010

10/8/2010 44

Nastran Tomorrow

This section is restricted from publication

10/8/2010 46

Thank YouThank You