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on the "negative cell volume" problem - udf: dynamesh

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Old   May 31, 2013, 04:27
Default on the "negative cell volume" problem - udf: dynamesh
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Stefanos Katifeoglou
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Dear CFD-online community,

I always encounter the "Negative cell volume" detection error during an individual dynamic mesh - 6DOF motion simulation. In the past i was able to face this problem by using the "preview mesh motion" option before the solution to track the time moment when the mesh would hang-off and adopt a smaller time step (depending on the velocity of the moving body with respect to the rate of deformation of the adjacent cell zone). Now, within a 6DOF motion simulation although i can't track the hang-off of the mesh while previewing the motion and it seems to move and deform fine, i always get the "negative volume" error. I've tried extremely small time steps and still encounter the same problem.

I would be grateful for any suggestions...


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