code_saturne User's Forum

Hi Maxime, Perhaps to get started, perhaps you could consider a sliding wall boundary condition? I am sure that it isn't exactly waht you want, but you could examine the shear-stresses on the wall after the calculation, to verify whether you have the basics correctly accounted for. Example: https://...

Hi Everybody, I would just like to confirm how people are undertaking their channel flow calculations in Code Saturne. I have successfully undertaken a channel flow calculation with the inlet/outlet mapping condition in the GUI. The results look good, but I could only get the case running well with ...

Hi Yvon, So the code seems to hang after "Destroying structures and ending computation" in the run_solver.log files. The problem is that the code keeps running in PBS, so I am being billed, even through the code is no longer running. Local case configuration: Date: Mon Apr 7 15:52:37 2025 ...

Hi Daniele, Could you please post (or PM) a few screen shots of your problem? It would be good to see the components of the Reynolds-stress tensor, epsilon, alpha, MPI partitioning, and the velocity components as well. :) Could you please also show me your run_solver.log summary of the residuals and...

Dear Yvon, I just wanted to verify something that I have observed on my version of CS8.3 on an Intel system, after updating my code to commit 7342705 (Main branch of git.). The solver seems to be hanging on the last timestep, and I wanted to see whether you observed this on your system as well? I ha...

Hi Daniele, The conclusion that I came to was that there was an MPI issue in CS8.2 relating to the Rij tensor, as the number of clipped cells was increasing with core count. When I visualised this, the clipping seemed to be related to the regions of the interface between MPI blocks. As I increased t...

Hi Yvon, In addition to my last post, I wanted to verify whether second-order timestepping has ever been available for the k-omega SST model in CS. The reason I ask, is that in Application of recently developed elliptic blending based models to separated flows by Billard, Revell, and Craft, the auth...

Hi Yvon, I was unable to see how to do this - if possible, could you please provide a script for this? I also wanted to enquire about using second-order time stepping with URANS. I wanted to run a k-w URANS study with this, and I received a warning that this is not currently supported. Is this somet...

Hi Yvon, Just as an update. The strange clipping phenomenon of the Reynolds-stress tensor (CS8.2) is no longer an issue in CS8.3. I observed that this became more prominent as the number of cores increased (i.e. MPI issue). There were two variables in this test (CS8.2 on an AMD EX Cray system, and t...

Dear Yvon, I have tried to extract some more time-averaged fields in the methodology that you have suggested. The fields that are of interest are: algo:gradient_velocity algo:gradient_pressure algo:rij_production algo:rij_pressure_strain_correlation The time-averaged pressure-strain tensor, and the ...