Running OSSmooth FEA Reanalysis with Optistruct

Rahul_P1
Rahul_P1
Altair Employee
edited October 2020 in Community Q&A

Hello,

my 2nd Problem is, that I am trying to run an FEA reanalysis with the Optistruct solver. I'am trying to use the *.oss parameterfile with the following inputs.

input_file XXX
output_file XXX.nas
output_code 3
autobead 1 0.300 1
isosurface 1 3 0.300
laplacian_smoothing 10 30.000 1

But I dont now how to start the FEA Reanalysis and not the Geometry option. Do i have to start the FEA Reanalysis in HyperMesh?

Best regards

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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    Kontrolturm,

    To do an FE reanalysis, which is basically to analyse your optimized shape,

    You can just go to Post > ossmooth within HyperMesh, select the input deck and the .sh file (for topology results for eg),

    make sure the option is set for FE reanalysis and then run OSSmooth, this will create an input deck, with the optimized shape applied with the same loads and boundary conditions (that you used before you ran the optimization).

    You can then run this deck in Optistruct to analyse your optimized shape

    Here is an example where I do a reanalysis on a topology model,
    First I prepare a topology optimization model
    z6062-2.png
    Clear my session and Then run ossmooth with the necessary parameters
    w8h89-1.JPG
    Then run the analysis on the input deck
    54029-3.png

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    Q:What is the purpose of this .oss file and why is it getting output even for a shape optimization problem also?

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    OSSmooth (for geometry) requires a parameter file (generally has the file extension .oss) to run. This parameter file may be generated from the OSSmooth panel in HyperMesh, or it may be generated manually through a text editor. At the completion of an optimization run, OptiStruct automatically exports an OSSmooth parameter file <prefix>.oss with certain default settings depending on the type of optimization run.

    See - Altair OptiStruct > User's Guide > Design Interpretation - OSSmooth > OSSmooth Parameter File in the help documentation for more information on the parameters.

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