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negative volume error in dynamic mesh

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Old   August 13, 2019, 09:21
Post negative volume error in dynamic mesh
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amdfzn
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Hi All
I want to simulate a simple movement of a cube (which represents a human) in a room using dynamic mesh. I used tetrahedral elements for all of the domain and also smoothing and remeshing methods for updating the mesh and defined the surfaces of the cube as rigid body zone. After some time (about 0.1 to 0.2 s), negative volume error occurs. I tried to reduce the time step and also changed different parameters in dynamic mesh settings but none of them works and I still get the negative volume error. Can someone help me with that please?
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Old   August 13, 2019, 12:58
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can u send the wb file to midhun6189@gmail.com if you are using version less than 19.1
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Old   August 14, 2019, 00:56
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Quote:
Originally Posted by amdfzn View Post
Hi All
I want to simulate a simple movement of a cube (which represents a human) in a room using dynamic mesh. I used tetrahedral elements for all of the domain and also smoothing and remeshing methods for updating the mesh and defined the surfaces of the cube as rigid body zone. After some time (about 0.1 to 0.2 s), negative volume error occurs. I tried to reduce the time step and also changed different parameters in dynamic mesh settings but none of them works and I still get the negative volume error. Can someone help me with that please?
Hi,

Sometimes negative cell volume is where the mesh is overlapping. Try changing the skewness in dynamic mesh or reduce the time step.
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Old   August 14, 2019, 02:39
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Hi,

Sometimes negative cell volume is where the mesh is overlapping. Try changing the skewness in dynamic mesh or reduce the time step.
Hi krishna,
I changed the face skewness to 0.4 and cell skewness to 0.7 and also reduced the time step but I still get the error.
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Old   August 16, 2019, 07:52
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Hi krishna,
I changed the face skewness to 0.4 and cell skewness to 0.7 and also reduced the time step but I still get the error.
Initially, try giving default skewness values.
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