Learning Forum

[ewold]

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

[Karthik Remella]

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]

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

[Aparna]

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

[Aparna]

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

[Aparna]

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

 

[Rob]

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

[FarhanMuhib]

@ewold, can you please help me solve the problem? I am having the same problem. Thanks