code_saturne User's Forum

Hello, i've got an error running flow simulation around an immersed monolith. i have run this simulation with a smooth monolith and it's working, but with the helix one it doesn't work.
I was thinking it was cause of the helix shape of the mesh but the preprocesor.log file is Ok
Have you an idea about the error ?
Files are accessible at https://unicloud.unicaen.fr/index.php/s/reY7iWqK7LdbSRE
Regards

Hello,

This is certainly a mesh quality issue, even though the classical quality "bad cell indicators" seem mostly OK. The fact that computing the wall distance needs disabling the reconstruction (see log) is a giveaway. Some cells might be too "flat" near the boundary.

Extruding the mesh at inlets/outlets and inserting a boundary cell layer (see mesh modification examples in documentation) might help a bit). If you can do that upstream with the meshing tool it is even better.

Best regards,

Yvan

Thank you Yvan for your answer
I'll work on the mesh this week and keep you inform
Regards