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




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


Training ManualStep 2 – Initiate an Explicit Dynamics (ANSYS) Project

2.a Create an Explicit Dynamics (ANSYS) ProjectSC

DC

2 S S f



2.b Select MKS for the Project Units and request Native Applications in Workbench have their values Displayed in the Project Units


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




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





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





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)



0


Training ManualStep 4 – Import the Geometry4.a Import the geometry database bird_strike.agdb as shown below

RMB SC




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




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




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




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



but not uniform


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)



on body)

7.d Select Apply


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



The mesh is now uniform


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




Training ManualStep 8 – Define the Initial Conditions ...

8.b Choose Define by Components: X = 250.0 m/s




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



now be transferred into AUTODYN to complete the setup for the SPH solver and run the analysis


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



set up in the Explicit Dynamics project


Training ManualStep 11 – Load a Plot Settings File11.a Load the plot settings file “bird_strike_1.set” to obtain the following view




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



New in the dialog panel


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




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




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)



j ( )


Training ManualStep 16 – Load a Plot Settings File16.a Load the plot settings file “bird_strike_2.set” to obtain the following view




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




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)



calculation)

ansys autodyn 121 workshop 05

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