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Warning: negative cell volume detected!

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Old   January 23, 2008, 22:46
Default Warning: negative cell volume detected!
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boboroo
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hi, i use dynamic mesh in my model of a sway tank. the tank is filled with water.

i load a time-dependent angular velocity to the tank walls.

then, i set the time step 4e-5, and after 500 steps, the warning is shown: Warning: negative cell volume detected! Error: Update dynamic mesh failed! Error Object: ()

anyone could tell me what is the problem. thanks in advance!
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Old   January 23, 2008, 23:09
Default Re: Warning: negative cell volume detected!
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shehab abdelrahman
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I'm not quite sure of that. but i guess your dynamic mesh has been deformed or squeezed until the edges of some or all the cells has interfered within the same cell. this is the definitions of the negative cell volume error. you need to improve your initial mesh to be not too angular and use structured mesh if possible. also you may increase the mesh size to account for the deformation displacement during the iteration until reaching the convergence without having negative mesh. I hope this will help
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Old   January 24, 2008, 01:29
Default Re: Warning: negative cell volume detected!
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boboroo
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thank you very much! i will have a try.
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Old   January 24, 2008, 02:17
Default Re: Warning: negative cell volume detected!
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mAx
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are you using layering/smoothing or remeshing method for the dynamic mesh?
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Old   January 24, 2008, 09:53
Default Re: Warning: negative cell volume detected!
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Sham
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Try with smaller time step or use a triangular mesh as it is better for MDM simulation. If this still does not work, you have to check your parameters in defining MDM.

Sham
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Old   August 4, 2015, 06:09
Default Negative volume detected
  #6
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Amit soni
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Updating mesh to time 2.00000e-02 (step = 00002)...
Dynamic Mesh Statistics:
Minimum Volume =-1.30210e-01
Maximum Volume = 1.37794e+00
Warning: negative cell volume detected!
Error: Update dynamic mesh failed. Negative cell volume detected.
I am also getting this , would you guide regarding this?
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Old   August 27, 2015, 02:03
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manoj
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Quote:
Originally Posted by Amit soni View Post
Updating mesh to time 2.00000e-02 (step = 00002)...
Dynamic Mesh Statistics:
Minimum Volume =-1.30210e-01
Maximum Volume = 1.37794e+00
Warning: negative cell volume detected!
Error: Update dynamic mesh failed. Negative cell volume detected.
I am also getting this , would you guide regarding this?
Amit I suppose you are using moving mesh.
problem with this is if you solve moving mesh problem once mesh moves and if you discard solution mesh will not retain original state so when you try to solve it again it will give negative mesh error. to remove it you need to reset "solution" using right click in workbench project menu. after reset you can solve again.
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