Ansys Autodyn 120 Workshop 06
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Transcript of Ansys Autodyn 120 Workshop 06
WS 6-1ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Workshop 6
Bird Strike
ANSYS AUTODYN
Workshop 6. Bird Strike
WS 6-2ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualWorkshop Goal and Procedure
Goal:
Model a bird strike on an aircraft wing
Procedure:
Set up the problem in Explicit Dynamics (ANSYS)
Transfer the setup to AUTODYN
Convert the Bird Part to use SPH nodes
Run the analysis in AUTODYN
Workshop 6. Bird Strike
WS 6-3ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 1 – Start Workbench
Start ANSYS Workbench and follow the sequenced steps using the abbreviations shown below:
– DC = Double Click with Left Mouse Button
– SC = Single Click with Left Mouse Button
– RMB = Right Mouse Button Selection
– D&D = Drag and Drop = Hold Left Mouse Button down on item while dragging it to new location and then release it (i.e., Copy or Move)
Throughout these Workshops, the procedures shown are not always the only way to accomplish the desired tasks, so feel free to investigate other methods via the documentation when outside of this course
• The workshops consistently use RMB in the Outline tree to access options whenever possible
• Often these options can also be accessed through the “Context” Toolbar
• Sometimes these options can also be accessed using RMB in the View area
Workshop 6. Bird Strike
WS 6-4ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training Manual
2.a Create an Explicit Dynamics (ANSYS) Project
2.b Select MKS for the Project Units and request Native Applications in Workbench have their values Displayed in the Project Units
Step 2 – Initiate an Explicit Dynamics (ANSYS) Project
DC
SC
Workshop 6. Bird Strike
WS 6-5ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 3 – Define Engineering Data Material
3.a Edit the Engineering Data cell to select pre-defined material models from one of the pre-defined material libraries
3.b Select the Explicit Materials library. Materials in this library have physical property data defined for explicit analyses
DC
SC
Workshop 6. Bird Strike
WS 6-6ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 3 – Define Engineering Data Material ...
3.c Select the “+” sign to the right of AL5083H116 to add it to the Engineering Datalibrary.
3.d Likewise, select the “+” sign to the right of WATER2. Note the symbol of a book that appears indicating success
SC
Workshop 6. Bird Strike
WS 6-7ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 3 – Define Engineering Data Material ...
3.f Return to the Project Schematic
3.g Save the Project by selecting the “Save As”icon and Browse to the directory indicated by your instructor. Enter “bird_strike” for the Project name
SC
3.e Go to the Engineering Datacell and note the added materials
Workshop 6. Bird Strike
WS 6-8ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 3 – Define Engineering Data Material ...
3.h Temporary fix
Return to Engineering Data and enter “0” for the Shear Modulus for WATER2.(This is an error that will be fixed in the next release)
0
Workshop 6. Bird Strike
WS 6-9ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 4 – Import the Geometry4.a Import the geometry database bird_strike.agdb as shown below
RMB SC
Workshop 6. Bird Strike
WS 6-10ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 5 – Edit the Model in Mechanical
5.a Edit the model in Workbench Mechanical.
RMB SC
5.b Select the MKS Units system– Recall that Mechanical is not native in Workbench,
so the Units here may not match the Project Units
Workshop 6. Bird Strike
WS 6-11ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 5 – Edit the Model in Mechanical ...5.c Assign a thickness of “0.005”
meters and the material AL5083H116 to Stiffener_1,Stiffener_2, Stiffener_3 andStiffener_4
5.d Assign a thickness of “0.003”meters and the material AL5083H116 to Skin
5.e Assign the material WATER2 to Bird
Workshop 6. Bird Strike
WS 6-12ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 5 – Edit the Model in Mechanical ...
5.f Notice the automatically defined Body Interaction. This allows a frictionless sliding interaction between all bodies
Workshop 6. Bird Strike
WS 6-13ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 6 – Generate the Default Mesh
6.a Generate the default mesh
Default mesh is reasonable, but not uniform
Quality of the Bird mesh is not important as it will only be used to create a region of SPH nodes in AUTODYN
RMB
Workshop 6. Bird Strike
WS 6-14ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 7 – Change the Mesh Method
7.a Insert a MeshingMethod
7.b Select all bodies (RMB in the view
area)
7.c Deselect the Bird body (<control> + SC on body)
7.d Select Apply
RMB
<control> + SC
SC
RMB SC
Workshop 6. Bird Strike
WS 6-15ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 7 – Change the Mesh Method …
7.e Select Uniform Quad for the Method
7.f Enter “0.025” m for the Element Size
7.g Enter “0.025” m for the Defeaturing Tolerance
7.h Generate the mesh
The mesh is now uniform
SCRMB
Workshop 6. Bird Strike
WS 6-16ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 8 – Define the Initial Conditions
8.a Apply an Initial Velocity Condition to the Bird as shown.
RMB SC
Note:If the Body selection filter is not automatically activated for the initial velocity condition, select it manually.
SC
Select the Bird body
Workshop 6. Bird Strike
WS 6-17ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 8 – Define the Initial Conditions ...
8.b Choose Define by Components: X = 250.0 m/s
Workshop 6. Bird Strike
WS 6-18ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 9 – Define the Analysis Settings
9.a Select Analysis Settings in the tree
9.b Set the End Time to 5.0e-3 seconds in the Details View
9.c Keep the remaining default settings
9.d Save the model on the Workbench Project page
SC
At this point the project has been set up a much as is possible in Explicit Dynamics (ANSYS). It will
now be transferred into AUTODYN to complete the setup for the SPH solver and run the analysis
Workshop 6. Bird Strike
WS 6-19ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 10 – Create (Link to) an AUTODYN Project10.a On the Workbench
Project page, under Component Systems, drag and drop the AUTODYN component onto the Setup cell for the Explicit Dynamics (ANSYS) project.This creates an AUTODYN project who’s setup is linked to the Explicit Dynamics Project
10.b Open the AUTODYN project, importing the model set up in the Explicit Dynamics project
RMB
SC
D&D
Workshop 6. Bird Strike
WS 6-20ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 11 – Generate an SPH Part for the Bird
11.c Enter “Bird_SPH” for the Part Name
11.d Select the SPH Solver
11.e Accept the data
11.a Select Parts On Navigation Bar
11.b Select New in the dialog panel
Workshop 6. Bird Strike
WS 6-21ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 12 – Create an SPH Object from the Bird Part
12.a Select Geometry (Zoning)
12.b Under Import Objects, select Part
12.c Select the Bird Part to convert to an object
12.d Name the Object “SPH_Bird”
12.e Accept the data
Workshop 6. Bird Strike
WS 6-22ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 13 – Delete the (Lagrange) Bird PartNow that the new SPH object has been created, the Bird Part (created in Explicit Dynamics) is no longer needed, so delete it
13.a Select Delete
13.b Select the Bird Part
13.c Accept the data
New SPH Object
Workshop 6. Bird Strike
WS 6-23ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 14 – Pack SPH_Bird Object with SPH Nodes
14.a Select Pack (Fill)
14.b Select the SPH_Bird
object
14.c Select Pack Selected Object(s)
14.d Check Fill with Initial Condition Set
14.e Select Initial Condition Set 3
(Water and 250 m/s)
14.h Accept the data14.f Select next
14.g Enter 15.0 mm for the Particle Size
Workshop 6. Bird Strike
WS 6-24ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 15 – Load a Plot Settings File15.a Load the plot settings file “bird_strike_2.set” to obtain the following
view
Workshop 6. Bird Strike
WS 6-25ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 16 – Set up the Bird / Wing Interaction16.a Select Interaction on the
Navigation Bar
16.b Select External Gap (this must be used for Lagrange/SPH interactions)
16.c Enter a Gap size of “1.5” mm
16.d Select Check
A message will tell you that the input parameters are OK
Workshop 6. Bird Strike
WS 6-26ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 17 – Run the Analysis
17.a Save the project on the Workbench Project Page
17.b Select Run to start the solve
17.c Once the calculation is running, Select Stop at any time to stop the calculation (you can then press Runagain to continue the calculation)
The calculation takes approximately 40 minutes to run
to completion (about 7500 cycles)