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LS Dyna

LS Dyna

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ICFD_Model_Viscoelasticity

    • January 30, 2026 at 3:47 am
      Dennis Chen
      Subscriber

      Hello, I am looking for some quick guidance on how to properly tie ICFD_Model_VIscoelasticity (oldboyd-B model) to a fluid material inside LS-Dyna.

      Would mat_elastic_fluid work if I just want to apply a pressure to a body that's made of this material (hot and flowing) and I want to evaluate how much this material is squeezed out.   Would this have to be a ICFD problem (Given the ICFD keyword)? so I have to run it as FSI in dyna?  How do I properly define the fluid material?

      I appreciate any guidance you guys can provide, thank you! 

      A general simple example model is MASSIVELY appreciated. zchen6@gatech.edu is my email. 

    • February 26, 2026 at 4:30 pm
      igandiko
      Ansys Employee

      ICFD_MODEL_VISCOELASTIC -> the viscoelastic model must  be referenced in ICFD_MAT. Please see documentation on both cards. 

      Please see below conference paper shows lid-driven cavity flow of Oldroyd-B fluid. I will send the input files to zchen6@gatech.edu.

      https://www.dynalook.com/conferences/17th-international-ls-dyna-conference-2024/biomedical-healthcare/solomenko_ansys.pdf

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