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General Mechanical

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242 Elements – compressible fluid

    • Sebastian Albarracin
      Subscriber

      Hello,

      Im trying to simulate a compressible gas inside a cube (0,1*0,1*0,1 m³) with a top plate attached to a spring (C=1 N/m) and Im using the following APDL commands:

      when i supress the D command and apply a 100 N force to the top plate the displacement is accurate to the stiffness of an air suspension, which is proportional to the reference pressure (500000 Pa):

      but when i unsupress the D command and i apply a force of 101 N, the fluid is no longer modelled and my top plate is holded only by the spring:

      is it possible to simulate a fluid with a given internal pressure + an external force? or there are some limitations to 242 elements?

      how come i can use the D command but not the IC command to initate the internal pressure? (is this the reason why my model doesnt work?)

       

    • Erik Kostson
      Ansys Employee

       

       

      Hi

      See the help manual for hsfld242 – hdsp which is basically internal pressure (D command) is explained,

       and so is IC (see IC command for more info – it often needs large deflections to ON to work in static analysis).

      Also this post explains the use of hsfld242: https://simutechgroup.com/contained-fluid-in-mechanical-fea-model-working-with-hsfld242-elements/

      Erik

       

       

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