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Hypercrash seat simulation

User: "Altair Forum User"
Altair Forum User
Altair Employee
Updated by Altair Forum User

Hello,

 

I am currently carrying out a seat Crash Simulation. I have followed the seat-dummy Simulation process stated in hypercrash tutorials for the same.

When I try to  the run the Simulation, the engine is crashing every time. The seat geometry is very complex and hence meshed seat contains some intersections which I am unable to fix. I think this might be reason for engine Crash.

I am a novice in meshing such complex geometries and as well as Crash simulations.

Please do provide any help or suggestions regarding the same.

 

I have attached the starter out (0000.out) file for concerned Simulation.

 

Regards,

Sumedh V Joshi

 

 

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    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Hi Sumedh,

    Use the recommended contact parameters are as below for interface Type 7:

    Istf=4

    Igap=2

    Fscale_Gap=0.8

    INACTI=6

    Gap_min=

    Fric = 0.1

    Iform=2

     

    Can you perform a model checking in HyperCrash (Quality>Model Checker), so that all possible modelling errors will be listed out. The steps for model checking can be seen at https://www.youtube.com/watch?v=xi-1EvfVuyw In the out file shared there are no penetrations listed.

     

    If you still face the issue I recommend you to share the model file through secure dropbox link so that we can review the same.

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Hello George,

     

    Thanks for the reply.

    I will work on your suggestions and get back to you!

     

    Regards,

    Sumedh V Joshi

    User: "Andy_20955"
    Andy_20955
    New Altair Community Member
    Updated by Andy_20955

    Hi,

    If you cannot remove the intersections in your mesh, then you could use /INTER/TYPE24 contact with Inacti=5 in areas where you have the intersections.  TYPE24 contact deals better with intersecting meshes than TYPE7.

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Hi Andy,

     

    Thanks for the reply!.

    I'll try the same and get back to you.

     

    regards,

    Sumedh

     

    User: "Andy_20955"
    Andy_20955
    New Altair Community Member
    Updated by Andy_20955

    I downloaded your *.out file.  You also need to check these warnings,

    WARNING ID :          666
    ** WARNING IN SOLID ELEMENT DEFINITION
    DESCRIPTION :  
       CHANGED CONNECTIVITY OF 3D ELEMENT ID=5865175 TO AVOID NEGATIVE VOLUME
     BRICK GROUP     18149 VECTORIZATION CODE =  255

     

    and

    WARNING ID :          430
    ** WARNING IN 4-NODE SHELL ELEMENT(S)
    DESCRIPTION :  
      CONCERNING 406 SHELL ELEMENT
      SHELL ID=31 IS A 4-NODE DEGENERATED SHELL ELEMENT, USE A 3-NODE SHELL FOR BETTER RESULTS

     

    I suspect you have some elements with poor quality that could also cause a crash.

     

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