SPH elements

Nancy Jewel Mcdonie
Nancy Jewel Mcdonie Altair Community Member
edited March 21 in Community Q&A

Hi all, 

I'm modeling sand with MLAW6 in Radioss, but I don't know how to define these parameters (C1)? 

Can you guy help me? 

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Answers

  • Polyvios Romanidis
    Polyvios Romanidis New Altair Community Member
    edited March 21

    Hi Nancy,

    The coefficients for /EOS must be determined experimentally or found by literature generally.  Another way to determine that, is to calibrate the results of your simulation based on a known response, but this also require data from a physical model.  So, you have to find the ones that best describe your material.

    I think that search in literature for data is your best option.  Any data that connect pressure and density can be used to define these coefficients.

    Additionally, /MAT/LAW6 is mainly used to simulate fluids and not porous media (like sand), so it is not a good choice for this application.

    I would recommend you /MAT/LAW10, /MAT/LAW21 or /MAT/LAW102 in contrast.

    Finally, /EOS/POLYNOMIAL is not preferred for sand material, but /EOS/COMPACTION fits better.  It is also more likely to find coefficient data for this /EOS and sand material.

    Polyvios

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