How to fix Boundary Openness and Open Cell errors?

Please help me understand these errors elaborately. In paraview I don't see any error. But when I type checkMesh, I get these errors. And surpassing this icoFoam/solver is running anyway without giving any error, though it is getting diverged due to large courant number. Are these mesh errors also responsible for the divergence in solution? Please explain

OpenFOAM 25-12-21, 10:14 p.m. Krishna_Deshmukh
Yes. Boundary openness causes divergence in the results. You need to fix it.
Please provide more information on geometry and mesh; which utility was used to generate mesh? Regards,
Divyesh Variya
28-12-21, 5:02 p.m. divyesh

I have fixed the boundary openness error. After a while the Courant Number diverges anyway. I have even used maxCo, adjustabletimestep etc, but still I don't get the solution.

29-12-21, 1:11 a.m. Krishna_Deshmukh

Can you share case files? You can upload codes on google drive and share the link. 

Divyesh Variya

29-12-21, 10:18 a.m. divyesh

Yes. Please help me identify the issues.


Also, see the geometry figure. Plenum case.

31-12-21, 1:41 a.m. Krishna_Deshmukh

Dear Krishna,
There are major corrections required in the boundary conditions. For example, the inlet direction in the U file is given in the Z-direction. But, the domain demands an inlet in the X-directions.
Also, if you are solving this problem for the 2D case, you need to define frontAndBack planes as an empty patch and maintain the unit cell in Z-direction. Defining it with walls is incorrect.

Divyesh Variya

03-01-22, 9:54 a.m. divyesh

Yes Sir. I already fixed those errors, I deleted the comment though. Thank you anyway.

03-01-22, 3:42 p.m. Krishna_Deshmukh

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