Ansys Autodyn 121 Workshop 05
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Transcript of Ansys Autodyn 121 Workshop 05
Workshop 5
Bird Strike
I t d ti t ANSYSIntroduction to ANSYS AUTODYN
WS 5-1ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualWorkshop Goal and Procedure
Goal:
Model a bird strike on an aircraft wingan aircraft wing
Procedure:
Set up the problem inSet up the problem in Explicit Dynamics (ANSYS)
Transfer the setup toTransfer the setup to AUTODYN
Convert the Bird Part SPH dto use SPH nodes
Run the analysis in AUTODYN
WS 5-2ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
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
WS 5-3ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
• Sometimes these options can also be accessed using RMB in the View area
Workshop 5. Bird Strike
Training ManualStep 2 – Initiate an Explicit Dynamics (ANSYS) Project
2.a Create an Explicit Dynamics (ANSYS) ProjectSC
DC
2 S S f
WS 5-4ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
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2.b Select MKS for the Project Units and request Native Applications in Workbench have their values Displayed in the Project Units
Workshop 5. Bird Strike
Training ManualStep 3 – Define Engineering Data Material
3 Edit th E i i D t ll t l t3.a Edit the Engineering Data cell to select pre-defined material models from one of the pre-defined material libraries DC
3.b Select the Explicit Materials library. Materials in this library have physical
t d t d fi d f li it lproperty data defined for explicit analyses
SC
WS 5-5ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
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.
SC
Note the symbol of a book that appears indicating success
WS 5-6ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 3 – Define Engineering Data Material ...
SC
3.e Go to the Engineering Datacell and note the added materials
3.f Return to the Project Schematic
added materials
Schematic
3.g Save the Project by selecting the “Save As”selecting the Save As icon and Browse to the directory indicated by your instructor. Enteryour instructor. Enter “bird_strike” for the Project name
WS 5-7ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 3 – Define Engineering Data Material ...
3.h Temporary fix
Return to Engineering Data andReturn to Engineering Data and enter “0” for the Shear Modulus for WATER2.(This is an error that will be fixed (in the next release)
WS 5-8ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
0
Workshop 5. Bird Strike
Training ManualStep 4 – Import the Geometry4.a Import the geometry database bird_strike.agdb as shown below
RMB SC
WS 5-9ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 5 – Edit the Model in Mechanical
5.a Edit the model in Workbench Mechanical.
RMB SCRMB SC
5.b Select the MKS Units systemRecall that Mechanical is not native in Workbench– Recall that Mechanical is not native in Workbench, so the Units here may not match the Project Units
WS 5-10ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
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
WS 5-11ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
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
WS 5-12ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 6 – Generate the Default Mesh
6.a Generate the default mesh
Quality of the Bird mesh is not important as it will only beQuality of the Bird mesh is not important as it will only be used to create a region of SPH nodes in AUTODYN
RMB
Default mesh is reasonable, but not uniform
WS 5-13ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
but not uniform
Workshop 5. Bird Strike
Training ManualStep 7 – Change the Mesh Method
RMB SC
RMBRMB SC
SC
7.a Insert a MeshingMethod
7.b Select all bodies (RMB in the view
area)
<control> + SC
7.c Deselect the Bird body (<control> + SC on body)
WS 5-14ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
on body)
7.d Select Apply
Workshop 5. Bird Strike
Training ManualStep 7 – Change the Mesh Method …
7.e Select Uniform Quad for the Method
7 f Enter “0 025” m for the7.f Enter 0.025 m for the Element Size
7.g Enter “0.025” m for the Defeaturing Tolerance
7.h Generate the mesh
RMBSC
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Release 12.1February 2010
The mesh is now uniform
Workshop 5. Bird Strike
Training ManualStep 8 – Define the Initial Conditions
8.a Apply an Initial Velocity Condition to the Bird as shown.
Note:
RMBSC
If the Body selection filter is not
SCSC
automatically activated for the initial velocity condition, select it
llSelect the manually.Select the Bird body
WS 5-16ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 8 – Define the Initial Conditions ...
8.b Choose Define by Components: X = 250.0 m/s
WS 5-17ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
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 ViewSC
9.c Keep the remaining default settings
9.d Save the model on the Workbench Project pageProject page
At this point the project has been set up a much as is possible in Explicit Dynamics (ANSYS). It will
b t f d i t AUTODYN t l t th
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Release 12.1February 2010
now be transferred into AUTODYN to complete the setup for the SPH solver and run the analysis
Workshop 5. Bird Strike
Training ManualStep 10 – Create (Link to) an AUTODYN Project10.a On the Workbench
Project page, under Component Systems, drag and drop thedrag and drop the AUTODYN component onto the Setup cell for the Explicit Dynamics (ANSYS) j
D&D(ANSYS) project.This creates an AUTODYN project who’s setup is linkedwho s setup is linked to the Explicit Dynamics Project
RMB
10.b Open the AUTODYN project, importing the model
t i th E li it
SC
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Release 12.1February 2010
set up in the Explicit Dynamics project
Workshop 5. Bird Strike
Training ManualStep 11 – Load a Plot Settings File11.a Load the plot settings file “bird_strike_1.set” to obtain the following view
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Workshop 5. Bird Strike
Training ManualStep 12 – Generate an SPH Part for the Bird
12.c Enter “Bird_SPH” for the Part Name
12.d Select the SPH Solver
12 S l t12.e Accept the
data
12.a Select Parts On Navigation BarBar
12.b Select N i th
WS 5-21ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
New in the dialog panel
Workshop 5. Bird Strike
Training ManualStep 13 – Create an SPH Object from the Bird Part
13.a Select Geometry (Zoning)
13.b Under Import Objects, select Part
13.c Select the Bird Part to convert to an object
13.d Name the Object “SPH_Bird”
13.e Accept the data
WS 5-22ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 14 – 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
S14.a Select Delete
14.b Select the Bird Part
14.c Accept the data
New SPH Object
WS 5-23ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 15 – Pack SPH_Bird Object with SPH Nodes15 S l t I iti l
15.d Check Fill with Initial
15.e Select Initial Condition Set 3
(Water and 250 m/s)
15.h Accept the
15.g Enter 15.0 mm for the Particle Size
15.a Select P k (Fill)
with Initial Condition Set
15.h Accept the data15.f Select next
Pack (Fill)
15.b Select the SPH_Bird
object
15.c Select Pack Selected Object(s)
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j ( )
Workshop 5. Bird Strike
Training ManualStep 16 – Load a Plot Settings File16.a Load the plot settings file “bird_strike_2.set” to obtain the following view
WS 5-25ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 17 – Set up the Bird / Wing Interaction17.a Select Interaction on the
Navigation Bar
17.b Select External Gap (this must be used for Lagrange/SPH interactions)
17.c Enter a Gap size of “1.5” mm
17.d Select Check
A message will tell you that the input parameters are OK
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Release 12.1February 2010
Workshop 5. Bird Strike
Training ManualStep 18 – Run the Analysis
18.a Save the project on the Workbench Project Page
The calculation takes approximately 40 minutes to run
to completion (about 7500 cycles)Project Page
18.b Select Run to start the solvethe solve
18.c Once the calculation is running,running, Select Stop at any time to stop the calculation ( th(you can then press Runagain to continue the calculation)
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calculation)