Mesh sizing leads to negative cell volume

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  • Last Post 11 October 2018
  • Topic Is Solved
ewold posted this 19 July 2018

Hello.

I am running a 2 way FSI simulation and recently tried to decrease the element size in my fluid mesh. Before I did this, I was operating on a fairly low mesh resolution and everything worked as expected. Whenever I try to raise the resolution I receive the negative cell volume error. Is there a way to fix this without decreasing the magnitude of my load or decreasing the timestep?

Thanks

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Kremella posted this 19 July 2018

Hello,

Could you please clarify in which tool you are seeing the negative volume error - Fluent or mechanical? If you are seeing this error in Fluent, you might want to check your dynamic mesh set-up. Perhaps, the time step size is large. Or perhaps you are seeing large deformations (deformations should be smaller than one cell 'height' on a per-timestep basis). Does this happen at the beginning of your simulation (right after 1st r 2nd iteration) or during it?

Please post some more details (along with some images).

Thank you.

Best,
Karthik

ewold posted this 23 July 2018

I was able to resolve the issue thanks to your response.

Aparna posted this 10 October 2018

i am also facing the same problem. how you resolved it. kindly help me. im simulating scroll expander.

Aparna posted this 11 October 2018

i am also facing the same problem. how you resolved it. kindly help me. im simulating scroll expander.

Aparna posted this 11 October 2018

i am also facing the same problem. how you resolved it. kindly help me. im simulating scroll expander.

 

rwoolhou posted this 11 October 2018

You might be better served by starting a new thread and including images of the geometry & mesh.

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