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dynamic mesh udf

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Old   February 12, 2014, 09:18
Unhappy dynamic mesh udf
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hilla tor
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hello I am trying to bulid a dynamic mesh in which the wall is moving like:

0.01sin(12x-20time)

when I am running the case it's written to me

Update dynamic mesh failed. negative cell volume detected

I chose smoothing method for the wall and User defined

what the problem can be?
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Old   February 21, 2014, 04:47
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Paritosh Vasava
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Can you post pictures of your case? Also are there other walls in contact wit the wall in motion?
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Old   February 22, 2014, 02:40
Default i uplode the case file
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hilla tor
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to here

https://drive.google.com/file/d/0B2-...it?usp=sharing

hillat4 is what i am trying to put as dynamicmesh on wall 5
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Old   March 1, 2014, 17:53
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Marc Pelegri
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I have done some simulations with moving walls. One very important thing to avoid negative cell volumes is that you make sure that every time step the wall (and the mesh associated with it) does not move a distance bigger than a single cell.

Try setting a time step small enough and you won't have negative cell volumes.
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