Ansys Autodyn 121 Workshop 05

Workshop 5 Bird StrikeIntroduction I t d ti to t ANSYS AUTODYN ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved. WS 5-1 Release 12.1 February 2010 Workshop 5. Bird Strike Workshop Goal and Procedure Goal: Model a bird strike on an aircraft wing Training Manual Procedure: Set up the problem in Explicit Dynamics (ANSYS) Transfer the setup to AUTODYN Convert the Bird Part to use SPH nodes d Run the analysis in AUTODYN ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved. WS 5-2 Release 12.1 February 2010 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 ANSYS. Proprietary © 2010 ANSYS. All rights reserved. Inc.e. Copy or Move) Throughout these Workshops. Inc.1 February 2010 WS 5-3 . Bird Strike Step 1 – Start Workbench Start ANSYS Workbench and follow the sequenced steps using the abbreviations shown below: – DC – SC = Double Click with Left Mouse Button = Single Click with Left Mouse Button Training Manual – 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.. Release 12.Workshop 5. the procedures shown are not always the only way to accomplish the desired tasks. Bird Strike Step 2 – Initiate an Explicit Dynamics (ANSYS) Project 2. All rights reserved.b Select 2 S MKS S for f the Project Units and request Native Applications in Workbench have their values Displayed in the Project Units ANSYS. Inc. Proprietary © 2010 ANSYS. WS 5-4 Release 12.a Create an Explicit Dynamics (ANSYS) Project SC Training Manual DC 2. Inc.Workshop 5.1 February 2010 . Inc.b Select the Explicit Materials library.a th Engineering E i i Data D t cell ll to t select l t pre-defined material models from one of the pre-defined material libraries 3. WS 5-5 Release 12. Inc.1 February 2010 . Proprietary © 2010 ANSYS.Workshop 5. Materials in this library have physical property t data d t defined d fi d for f explicit li it analyses l SC ANSYS. Bird Strike Step 3 – Define Engineering Data Material DC Training Manual 3 Edit the 3. All rights reserved. Inc. select the “+” sign to the right of WATER2. Note the symbol of a book that appears indicating success SC ANSYS.d Likewise.1 February 2010 . WS 5-6 Release 12. Proprietary © 2010 ANSYS. Inc. 3.. Bird Strike Step 3 – Define Engineering Data Material . Training Manual 3..Workshop 5.c Select the “+” sign to the right of AL5083H116 to add it to the Engineering Data library. All rights reserved. Enter “bird_strike” for the Project name Training Manual SC ANSYS.f Return to the Project Schematic 3. All rights reserved.1 February 2010 . Proprietary © 2010 ANSYS.e Go to the Engineering Data cell and note the added materials 3. 3.Workshop 5.. WS 5-7 Release 12. Inc. Inc.. Bird Strike Step 3 – Define Engineering Data Material .g Save the Project by selecting the “Save As” icon and Browse to the directory indicated by your instructor. (This is an error that will be fixed ( in the next release) Training Manual 0 ANSYS. Inc. WS 5-8 Release 12. Bird Strike Step 3 – Define Engineering Data Material . All rights reserved.Workshop 5... Proprietary © 2010 ANSYS.h Temporary fix Return to Engineering Data and enter “0” for the Shear Modulus for WATER2.1 February 2010 . Inc. 3. a Import the geometry database bird_strike.1 February 2010 . Proprietary © 2010 ANSYS.Workshop 5. Inc. Inc. Bird Strike Step 4 – Import the Geometry Training Manual 4. WS 5-9 Release 12. All rights reserved.agdb as shown below RMB SC ANSYS. Workshop 5. Inc. Proprietary © 2010 ANSYS. Inc.b Select the MKS Units system – Recall that Mechanical is not native in Workbench. WS 5-10 Release 12.1 February 2010 . All rights reserved.a Edit the model in Workbench Mechanical. Bird Strike Step 5 – Edit the Model in Mechanical 5. Workbench so the Units here may not match the Project Units ANSYS. Training Manual RMB SC 5. Bird Strike Step 5 – Edit the Model in Mechanical .005” meters and the material AL5083H116 to Stiffener_1. WS 5-11 Release 12.1 February 2010 . 5. Stiffener_3 and Stiffener_4 5. Inc. Stiffener_2.e Assign the material WATER2 to Bird Training Manual ANSYS. All rights reserved.003” meters and the material AL5083H116 to Skin 5.. Inc..Workshop 5.d Assign a thickness of “0. Proprietary © 2010 ANSYS.c Assign a thickness of “0. .Workshop 5.1 February 2010 . All rights reserved. This allows a frictionless sliding interaction between all bodies Training Manual ANSYS. WS 5-12 Release 12.f Notice the automatically defined Body Interaction. Bird Strike Step 5 – Edit the Model in Mechanical . Inc.. 5. Inc. Proprietary © 2010 ANSYS. Bird Strike Step 6 – Generate the Default Mesh 6.Workshop 5. but not uniform ANSYS. Proprietary © 2010 ANSYS.a Generate the default mesh Training Manual Quality 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. All rights reserved. Inc.1 February 2010 . Inc. WS 5-13 Release 12. Bird Strike Step 7 – Change the Mesh Method RMB SC Training Manual RMB SC 7. Release 12.d Select Apply ANSYS.c Deselect the Bird body (<control> + SC on body) 7.1 February 2010 <control> + SC WS 5-14 .b Select all bodies (RMB in the view area) 7. Proprietary © 2010 ANSYS.Workshop 5. Inc. Inc.a Insert a Meshing Method 7. All rights reserved. 1 February 2010 .Workshop 5. All rights reserved.e Select Uniform Quad for the Method 7 f Enter “0 7. WS 5-15 Release 12.g Enter “0. Inc.025” m for the Defeaturing Tolerance 7.025 025” m for the Element Size 7.h Generate the mesh Training Manual RMB SC The mesh is now uniform ANSYS.f 0. Proprietary © 2010 ANSYS. Inc. Bird Strike Step 7 – Change the Mesh Method … 7. a Apply an Initial Velocity Condition to the Bird as shown. WS 5-16 Release 12. Inc. All rights reserved.Workshop 5. Training Manual RMB SC SC Select the Bird body Note: If the Body selection filter is not automatically activated for the initial velocity condition.1 February 2010 . select it manually. Bird Strike Step 8 – Define the Initial Conditions 8. Proprietary © 2010 ANSYS. Inc. ll ANSYS. . Inc.b Choose Define by Components: X = 250. Inc. WS 5-17 Release 12. Proprietary © 2010 ANSYS.. 8.0 m/s Training Manual ANSYS.1 February 2010 .Workshop 5. All rights reserved. Bird Strike Step 8 – Define the Initial Conditions . Inc.b Set the End Time to 5.Workshop 5. All rights reserved.d Save the model on the Workbench Project page At this point the project has been set up a much as is possible in Explicit Dynamics (ANSYS). It will now be b transferred t f d into i t AUTODYN t to complete l t th the setup for the SPH solver and run the analysis ANSYS.0e-3 seconds in the Details View 9. Inc.c Keep the remaining default settings SC 9. Bird Strike Step 9 – Define the Analysis Settings Training Manual 9. Proprietary © 2010 ANSYS. WS 5-18 Release 12.a Select Analysis Settings in the tree 9.1 February 2010 . Bird Strike Step 10 – Create (Link to) an AUTODYN Project 10. under Component Systems. j This creates an AUTODYN project who’s who s setup is linked to the Explicit Dynamics Project 10. Inc.1 February 2010 . drag and drop the AUTODYN component onto the Setup cell for the Explicit Dynamics (ANSYS) project. Proprietary © 2010 ANSYS.b Open the AUTODYN project. Training Manual D&D RMB SC WS 5-19 Release 12. Inc.a On the Workbench Project page.Workshop 5. All rights reserved. importing the model set t up i in the th Explicit E li it Dynamics project ANSYS. Inc. All rights reserved.Workshop 5. Proprietary © 2010 ANSYS.set” to obtain the following view ANSYS. Inc. Bird Strike Step 11 – Load a Plot Settings File Training Manual 11.a Load the plot settings file “bird_strike_1. WS 5-20 Release 12.1 February 2010 . All rights reserved. Bird Strike Step 12 – Generate an SPH Part for the Bird Training Manual 12.c Enter “Bird_SPH” for the Part Name 12.b Select N New i the in th dialog panel ANSYS.1 February 2010 . Inc.e Accept the data WS 5-21 Release 12. 12.a S 12 Select l t Parts On Navigation Bar 12. Inc.Workshop 5.d Select the SPH Solver 12. Proprietary © 2010 ANSYS. Workshop 5.1 February 2010 .d Name the Object “SPH_Bird” 13. All rights reserved.c Select the Bird Part to convert to an object 13. select Part 13. Bird Strike Step 13 – Create an SPH Object from the Bird Part 13. WS 5-22 Release 12.b Under Import Objects.e Accept the data Training Manual ANSYS.a Select Geometry (Zoning) 13. Proprietary © 2010 ANSYS. Inc. Inc. b Select the Bird Part 14. Proprietary © 2010 ANSYS. WS 5-23 Release 12.c Accept the data New SPH Object ANSYS. All rights reserved.1 February 2010 . so delete it 14.a Select S Delete 14. the Bird Part (created in Explicit Dynamics) is no longer needed.Workshop 5. Inc. Inc. Bird Strike Step 14 – Delete the (Lagrange) Bird Part Training Manual Now that the new SPH object has been created. c Select Pack Selected j ( ) Object(s) ANSYS.Workshop 5.d Check Fill 15.0 mm for the Particle (Water and 250 m/s) Size 15. Proprietary © 2010 ANSYS.h Accept the with Initial data 15.e S 15 Select l tI Initial iti l Condition Set 3 Training Manual 15.1 February 2010 . Inc. Inc.g Enter 15.a Select P k (Fill) Pack 15. WS 5-24 Release 12.f Select next Condition Set 15. All rights reserved.b Select the SPH_Bird object 15. Bird Strike Step 15 – Pack SPH_Bird Object with SPH Nodes 15. Workshop 5.set” to obtain the following view ANSYS. Proprietary © 2010 ANSYS. WS 5-25 Release 12.1 February 2010 . Inc. Bird Strike Step 16 – Load a Plot Settings File Training Manual 16. All rights reserved.a Load the plot settings file “bird_strike_2. Inc. b Select External Gap (this must be used for Lagrange/SPH interactions) 17.a Select Interaction on the Navigation Bar 17.5” mm 17.1 February 2010 .d Select Check A message will tell you that the input parameters are OK Training Manual ANSYS. Inc. WS 5-26 Release 12. Bird Strike Step 17 – Set up the Bird / Wing Interaction 17.Workshop 5. Inc. Proprietary © 2010 ANSYS.c Enter a Gap size of “1. All rights reserved. Inc. Inc.1 February 2010 . Select Stop at any time to stop the calculation ( (you can then th press Run again to continue the calculation) Training Manual The calculation takes approximately 40 minutes to run to completion (about 7500 cycles) ANSYS.c Once the calculation is running.Workshop 5. Bird Strike Step 18 – Run the Analysis 18. Proprietary © 2010 ANSYS. WS 5-27 Release 12. All rights reserved.b Select Run to start the solve 18.a Save the project on the Workbench Project Page 18.