olas anexo1 guia aqwa
DESCRIPTION
Beñat Rodríguez Julen García¿What is Aqwa? Aqwa is a software included in Ansys Is an engineering toolset designed to simulate the effects of wave,wind and current on both floating and fixed offshore structures The Hydrodynamic Diffraction tool enables the developing of the primary hydrodynamic parameters required for the analysis of motions and responses It is also possible to generate pressure and inertial loading The purpose of this work is to guide new users throughout theirTRANSCRIPT
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Beñat Rodríguez
Julen García
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¿What is Aqwa? Aqwa is a software included in Ansys
Is an engineering toolset designed to simulate the effects of wave,
wind and current on both floating and fixed offshore structures
The Hydrodynamic Diffraction tool enables the developing of the
primary hydrodynamic parameters required for the analysis of
motions and responses
It is also possible to generate pressure and inertial loading
The purpose of this work is to guide new users throughout their
first steps of the learning of the program
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Modules Aqwa Line
Regular waves
Aqwa Graphical Supervisor
Graphical Supervisor
AqwaWave
Structural FEM analysis
AqwaWorkbench
Used to create an element based model from geometry defined in
Ansys Design Modeler, apply AQWA specific input and view results
It is the one analyzed in this guide
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1. Creating the geometry AqwaWorkbench (AQWAWB) requires a geometry fully
compatible with the program
For that purpose, some operations will be carried out in the AnsysWorkbench (do not confuse with Aqwawb)
Open AnsysWorkbench
In AnsysWorkbench, select “Geometry” in
“Component Systems” of the “Toolbox”
That will open a new box with an empty
geometry. Double-clicking on the question
mark will open the Ansys Design Modeler (DM)
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1. Creating the geometry Once in the DM, and after selecting the units to work with,
there are two options:
A) Import a geometry already created with a CAD program
B) Create a geometry with the DM
Once that is done, some operations are needed in the DM in
order to make the geometry compatible with AQWAWB
Just for basic tutorial purposes, the creation of a simple cylinder
in the DM is briefly explained here
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1. Creating the geometry DM CAD tool is simple, but with a little extra work, simple-
medium geometries can be created
For learning purposes, a generic cylinder’s creation will be
explained. Later, with experience, some tricks can be used to
make it quicker the fulfillment of the subsequent compatibility
conditions
The cylinder is pretended to be a vertical offshore energy system
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1. Creating the geometry Will be created a cylinder with the X axis being the longitudinal
one NOTE: Directly creating a cylinder with the Z axis being the longitudinal one would make the
work easier, but for learning purposes here is designed in another way
The characteristics are [MKS]:
Length: 15
Diameter: 4
Cylinder density: 600
Water density: 1028
So, with basic fluid's theory (not explained here):
Draft: 8.75 [Draft=Length*(ρcyl/ρwat)]
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1. Creating the geometry DM has three main windows:
Graphics
Tree Outline
Details view
In the tree outline, is important
to remark that there are two tabs:
Sketching
Modeling
In the upper part there are some tool bars which include file management, selection, viewing and operations icons
graphics
tree outline
detail’s view
tool bars
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1. Creating the geometry NOTE: DM’s use is not the aim of this tutorial so just a briefly guide of steps is carried out here.
Anyway, no problems should arise since the geometry is very simple. For further explanation check DM tutorials
Select YZPlane and click in the blue icon of the tool’s bar name “New sketch”
It is important to understand that every plane, body… always has a blue arrow pointing its normal direction
Sketch1 will appear in YZPlane. Select it and click in the “Sketching” tab of the “Tree outline”
Select “Circle” and click on the coordinate origin
Move the mouse and click to select its diameter
(select a random one)
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1. Creating the geometry In the “Sketching” tab, below all the drawings (line, circle,
ellipse…), click on dimensions
Select “Diameter” and click on the created circle
In “Details View” window set D1 to 4
In the tool’s bar click on the “Generate” icon (a yellow thunder) in order to integrate the new sketch in the geometry
Click on the “Extrude” icon of the tool’s bar
Extrude1 should appear in the “Tree Outline”
In “Detail’s view” window click on the box which is to the right of “Base Object”
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1. Creating the geometry Select “Sketch1” either in the “Tree Outline” or directly in the
“Graphics” window, and click “Apply”
In “FD1, Depth (>0)” input 15
Click on “Generate”
With this, the creation of the cylinder is completed
We could have also reached this point importing a CAD geometry: File/Import External Geometry File…
Now, the compatibility requirement’s fulfillment will be explained
NOTE: It would have been better to change, in “Direction”, from “Normal” to “Both – Asymmetric” and set the values that make directly the XYPlane coincident with Global Water Axis
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2. General modeling requirements Requirements:
Only Lines and Surfaces are processed (not Bodies)
Surfaces must have normals pointing outwards
The model is oriented Z axis vertical up
The model has to be split at the water line
Each structure should be a part
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2. General modeling requirements The structure is a Body. It can be looked in “Tree Outline”, that below ”1
Part, 1 Body” there is one “Solid”
It has to be a surface. For this purpose, select “Thin/Surface” of the tool’s bar
“Thin1” should appear in “Tree Outline”
In “Details View”, in “Selection Type” select “Bodies Only”
Click on the box to the right of “Geometry” and then on the Body. Then click “Apply”
In “FD1, Thickness (>=0)” input 0
and click on “Generate”
Now, in ”1 Part, 1 Body” there is one
“Surface Body” NOTE: If you create an operation, i.e. “Thin1”, and then you delete it, when creating a new one, its
name would be “Thin2” even if now there is no “Thin1”
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2. General modeling requirements Structure’s longitudinal axis must be on the Z axis
For that purpose a rotation and a translation must be carried out. This is done via “Body Operation”
Click on Create/Body Operation
BodyOp1 should appear in the “Tree Outline”
In “Details View”, in type select “Rotate”
In “Bodies” select our body like done previously
In “Axis Definition” select “Components”
The rotation axis is Y, and the required angle is 90º, so in the components put 0, 1 and 0. And the angle 90º
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2. General modeling requirements Now, the translation is required
AQWAWB requires that the draft line is at the fixed reference
axis. XYPlane will always be the draft line
Since our structure has a length of 15 and a draft of 8.75, the
structure has to be translated 6.25 units in the Z+ axis (=15-
8.75)
So, a new plane is required in order to make the operation
Click on Create/New Plane
Plane4 should appear in the “Tree Outline”
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2. General modeling requirements In “Detail’s View”, select “XYPlane” as Base Plane, in “Transform1
(RBD)” Select “Offset Z” and input 6.25 as a value NOTE: The international version of the program uses comma [,] and not period [.] as decimal
separator, so input “6,25”
Click on “Generate” to proceed
Now, perform a new “Body Operation”, “BodyOp5”, of type
“Move”, where the source plane is “XYPlane” and destination
plane is “Plane4”
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2. General modeling requirements When clicking in “XYPlane” and rotating the view, will be easy to
see the how the draft line goes through the right place
Now, the surface must be split at the draft line
For that purpose, it is required to freeze and then split the
structure. This is used with “Freeze” and “Slice”
First, click on Tools/Freeze
Then, click on Create/Slice
Slice1 should appear in “Tree Outline”
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2. General modeling requirements Select “XYPlane” as base plane and generate
After this, “2 Parts/ 2 Bodies” appear in “Tree Outline” with 2 “Surface Body”-s below it
One of the requirements is that
the structure has to be a single part.
In order to achieve this, hold the control
key while clicking on both “Surface Body”-s
Free control key, right-click on
the selection and select “Form New Part”
This completes the procedure. The structure is ready
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2. General modeling requirements There are two concepts to understand:
One thing is saving the work of the interface. It is done in the DM:
File/Save Project, or directly in the AnsysWorkbench: File/Save
(.wbpj)
But the file imported by AQWAWB has another extension (.agdb).
It is exported from the DM by clicking on File/Export…
The .agdb file is the one to import from AQWAWB
Set its name: “aqwawbguide1”
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3. Importing the geometry Open AQWAWB
AQWAWB has three main windows:
Graphics
Outline
Details
Output
In the upper part there are some tool bars which include file
management, selection, viewing and operations icons
graphics
output
outline
details
tool’s bars
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3. Importing the geometry For importing the geometry right-click on “Geometry” and select
“Insert Geometry” and “From File…”
Import “aqwawbguide.agdb” from where you saved it
After some time the bar will reach the 100% and if there is no error the geometry should appear very small in the “Graphics” window
There are three elements in the “Graphics” window: A big dark-grey square (the bottom of the sea)
A very small cylinder (the structure)
A big light-grey square dividing the cylinder (the water line)
For viewing purposes, click on “Part” and select “Zoom to Fit” on the tool’s bar (the magnifier with a blue box inside) to fit the zoom to the cylinder
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3. Importing the geometry
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4. Pre-processing I: The geometry Click on “Geometry” in “Outline” window. In “Details” window, there
are some options needed to know
The sea level must coincide with where the surface is split
The depth of the sea can be defined. For the analysis it will be fixed to 500. Is an important variable since the results will depend on it and, as it will be explained later, frequency range will be determined by this
The density of the water is a function of the temperature. In Europe is 1028 is the most common, being 1026 the standard for USA. In this analysis will be set to 1028
NOTE: Remember that the units are already set. Of course Kg/m^3
The size of the water will affect the display and
will be 1000 for either X and Y
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4. Pre-processing I: The geometry Click on “Part” in “Outline” window.
In this section it is possible to show or hide the geometry using
“Part Visibility” and decide if the geometry will take part in the
analysis or not via “Part Activity”. In the analysis, the part will be
active and visible
Also, it is possible to fix the structure or let it free to move
(what is done in this analysis). No internal lid is required here,
but could be useful, for instance, in a moon pool
No linear damping is required
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4. Pre-processing I: The geometry Now, click on the first “Surface Body” (check that only the part
below the water is now green) NOTE: if the below water part is the second one, select that second “Surface Body”
It’s required to have the below water surface as a diffracting
surface, and the one above the water as a non-diffracting one.
This is done with “Surface Type”
“Structure Type” must be set as a “Physical geometry” in the
analyzed structure
Now, the mass and inertias must be included
Click on “Part” and then, in the upper bar, select Add/Point Mass
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4. Pre-processing I: The geometry Physical characteristics of the cylinder are:
Mass: 113097 [Mass=Density*Volume]
Inertias:
For generic cylinder with z axis longitudinal
Ix=(1/2)*M*(R^2)
Iy=Iz=(1/12)*M*{[3*(R^2)]+(L^2)}
Iyz=(1/12)*M*(L^2)
Ixy=Izx=(1/4)*M*(R^2)
For this guide’s cylinder:
Ix=226194
Iy=Iz=2233666
Iyz=2120569
Ixy=Izx=113097
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4. Pre-processing I: The geometry Click on “Point Mass”
In “Mass Definition” change it to “Manual” and set it to 113097
The inertia can be input directly or using the radius of gyration as can be seen in “Define inertia values by”.
Using “Direct input of inertia”: Ixx=226194
Ixy=113097
Ixz=113097
Iyy=2233666
Iyz=2120569
Izz=2233666
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4. Pre-processing I: The geometry It is important that “X”, “Y” and “Z” are selected so that the
“Point Mass” is applied right into the mass centre of the cylinder.
For this example, Z is required to be -1.25 [=(Length/2)-Draft]
“Point Buoyancy” and “Disc” can also be included
Point Buoyancy requires a position and a volume
Disc can be used to create an area that has drag and added mass in
the direction perpendicular to the disc
With this work, the geometry is done and we are ready to set the
Mesh
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5. Pre-processing II: The mesh Click on “Mesh”
In “Meshing Type” the algorythm used for the mesh generation can be controled. It works nice as “Program Controlled” but if any problem arised, change it to adjust it to the required geometry
There are 2 variables which can be changed:
“Defeaturing Tolerance” (how small the details are treated)
“Max Element Size” (maximum size of an ellement)
Note that “Max Allowed Frequency” is inversely proportional to “Max Element Size”
It is required that:
Defeaturing tolerance < 0.6 * Max element size
No. Of Elements < 18000 (of which diffracting < 12000)
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5. Pre-processing II: The mesh For our analysis, set:
DefeaturingTolerance: 0.8
Max Element Size: 1.4
If you click in “Mesh” and then in the upper bar select InsertMesh Control/Sizing, a new option is avaible
This option enables the refinement of a mesh on any given partor body, by enabling a smaller element size to be associated tothe geometry. Will not be used in this guide.
NOTE: In case you added it, it is possible to delete it by right-clicking it and selecting “Delete”. Note that “Supress” also deletes it, but by unsupressing it, becomes avaible again
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5. Pre-processing II: The mesh Once it is all set, click on “Generate Mesh” (yellow thunder)
After a while (large time if the selected size is too small), the
mesh will be generated
To view it, click on “Part”,then in “ZoomFit” (remember, the
magnifier with a blue box inside), and then on “Mesh”
Once it is done, it is time to set the analysis
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6. Pre-processing III: The analysis Click on “aqwawbguide1” and the on Insert analysis/Hydrodynamic
Diffraction
A new icon named “Analysis XX” should have appeared
Click on “Analysis Options”
The “Sea Grid Factor” controls how much larger the area is than the
structure. Set it to 2
In “Output File Options” there are multyple options to manage the files
outputted by AQWAWB. Let all them as “No”
“Common analysis options” control how the analysis is performed. It is useful
to activate “Ignore modelling rule violations”. Activate it and let the others
desactivated
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6. Pre-processing III: The analysis “Structure selection” tree object enables the definition of
interacting structures
Is used to exclude structures that you want to exclude for any
particular analysis
It also enables the order of solving to be changed
For this analysis, do not change anything here
“Gravity” enables the definition of gravity
It should not be changed in most cases
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6. Pre-processing III: The analysis Click on “Wave Directions”
It is possible to add a forward speed to the structure, but if that is done, only
a single wave direction can be analyzed. We will not use it
Waves are automatically created in -180 and +180 directions
It is possible to set the interval between the required directions, or simple
put how many intermediate directions are. Selecting too many can make the
solving costly. Put 7 intermediate directions
It is also possible to add intermediate directions or ranges of directions
NOTE: 0º is always X+
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6. Pre-processing III: The analysis Click on “Wave frequencies”
It is possible to select either one single frequency or a range of them. Select
“Range”
It is required to set the starting and ending frenquency
Approximate requirements: Start Frequency > 0.16 / (Water Depth)^0.5
End Frequency < 0.51 / (Max Element Size)^0.5
End Frencuency > 1.1 Start Frequency
Set “Start Frequency” to 0.10 and “End Frequency” to 0.40
Also, add 12 intermediate values
Of course, period is the inverse of the frequency so any change in one of
them would affect the other
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7. Processing There are two analysis options for a Hydrodynamic Diffraction analysis:
either to calculate the Hydrostatics only, or to calculate the full Hydrodynamic results
Typically, you will first do the first one if you are not sure of the pre-processing and want to check for errors in a quick solving, or simply if youjust require the hydrostatics
The solving is done by clicking on “Analysis XX” and then on “Solve” or“Solve Hydrostatics”
Click on “Solve”
You will be able to follow the progress of the analysis through the smallwindow that is opened during the analysis
Once it ends, is time to check the results
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8. Post-processing Right-click on “Results”. Add “Hydrostatic”, “Hydrodynamic Graph” and “Pressures
and Motions”.
Click on “Part” and then on “ZoomFit” (remember: the magnifier with a small blue
box inside)
Click on “Hydrostatic”
The Centre of Gravity appears in green (is equal to the “Point Mass” in this case)
The Centre of Buoyancy appears in red
The Centre of Floatation appears in blue
In “Graphics” window there is a small tab called “Properties”
Clicking on it, detailed hydrostatics results will appear:
Hydrostatic Displacement Properties, CutWater
Plane Properties, Small Angles Stability Parameters
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8. Post-processing
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8. Post-processing “Hydrodynamic Graph” enables the plotting of up to 4 comparative graph
results
Can be plotted against either Frequency or Period and can be Amplitude orPhase based
In “Line A” select the structure and view how the results operate
It is possible to plot different types of results as hydrodynamic coefficients orforces
NOTE: Check theory for the meaning of the different results
For this guide application, just select the RAOs (Response AmplitudeOperators) in Z axis in any direction (Amplitude based against Frequency) and check how, starting from 1 (no amplification), the maximum for thisparticular case happens close to 0.15 Hz, and then when the frequency is toohigh the RAOs are negligible
Also, add another line to plot how the Diffraction + Froude-Krylov forces in Z axis is smaller when the frequency of the waves increases
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8. Post-processing
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8. Post-processing Finally, “Pressures and Motions” enables the visualization and display of a number of
results generated from AQWA once a hydrodynamic solve has been performed
Using “Result Selection”,all the combination of the analyzed wave types can beselected (wave’s frequencies and directions)
“IncidentWave Amplitude” can be selected
In “ResultType” can be selected constat ones like “Maximum”, “Minimum or“Amplitude”, or also “Cyclic” where just a single phase or a “Range” of them can beselected (allowing a video output)
In “Contour Selection” both the Preassure (Interpolated or Panel) can be selected. There are options where it is possible to select if the body above the water has “ZeroPressure” or is simply “Dimmed”. The pressure can be measured as “Head of Water” or as “Force/Area”. There is also the possibility to visualize the “ResultantDisplacement” in “Structure ContourType”. In both cases, it is possible to visualizeor not the waves (“Wave ContourType”)
“Component Selection” allows the disabling of different parts of the visualization
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8. Post-processing In this guide, the following case will be analyzed:
Frequency: 0.22
Direction: 45
IncidentWave Amplitude: 1.5
ResultType: Cyclic
Wave Position (Phase): Range
No. Of Steps: 60
Structure ContourType: Interpolated Preassure
AboveWater Body Display: Zero Pressure
Pressure Measurement: Head of Water
Wave ContourType: Wave Height
Click on “Part” and then on “ZoomFit”. Then click on “Pressures and Motions”, and in “Output”window, below the Graphical window, click on thered “Play”. A video file (.avi) can be exported
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8. Post-processing
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Beñat Rodríguez (undergraduate scholarship)
Julen García (undergraduate assistant)
Faculty of Engineering in Bilbao
Tecnalia Researching Room