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Old   November 5, 2010, 13:04
Default moving mesh rolling piston
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hi all.
i'm simulating a rolling piston with a moving mesh.
I use the remesh method . the setings for the walls of the slider which is directly connected to the piston are; deforming.
the piston motion is defined by a udf.

the main problem is that the simulation takes some iterations, but then accurs an arror.
the error at the calculation process is: Divergence detected at AMG-Solver
and the error at the preview mesh motion is: negative cell volumen detected.

do some one has a hint, what is wrong
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Old   November 6, 2010, 16:51
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Hi,

I think It's because of poor quality of your meshes. try to improve it, it might help
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Old   November 7, 2010, 18:31
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Hi arash_7444 thank you for reply.
I dont think that the problem is because of poor mesh quality, but in any case I will check it tomorrow.
what i not understand is: why the calculation of the case takes some iterations an then the error eccurs. schould the mesh not be remeshed if the maximum scew gous over the maximum scew factor?
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Old   November 8, 2010, 03:21
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hi arash_7444, I just checked the mesh quality and the error is the same .
may you have any other hints, how to solve this problem. thank's in andvance.
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Old   November 11, 2010, 10:46
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i solved the problem. the slider and the rotary pistow were connected, but this is not allowed if the piston is a rigid body.
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