code_saturne User's Forum

I cannot suggest anything for multiple meshes, I never used more than one mesh with Saturne. But, actually, if you have a pipe junction, you only need one mesh for entire calculation domain. If you decide to use 2 meshes, you will need two species for both of them. Define unity concentration of the ...

I think you can use 2 species. Open Species Transport under Calculation Features and add 2 species. Also, you need to add temperature scalar in Thermal Model window. You will have species concentrations (I don't know mass or volumetric) and temperature at any inlet. Then, to account for thermophysic...

Hello. I don't think it's possible via GUI, but you can try with subroutine in cs_user_extra_operations.c . Please check how boundary force is calculated in cs_user_extra_operations-boundary_forces.c example (located in /install-dir/share/code_saturne/user_sources/EXAMPLES/ ), then make similar code...

Hello. Fluid velocity will only be zero at the wall surface. In CFD codes, what you see in results depend on where are they discretised. If velocities are in cell centers, you only will see zero velocity at the wall with inflated mesh (SST turbulence model). If velocities are in mesh nodes (not cell...

Hello. I made calculation starting from "good" initial approximation and it was successful with real viscosity and SOLU discretisation with blending factor 0.75. Thanks for your help! Here is an algorithm I used to solve this problem. Stage 1 Fluid viscosity: 500 x Real (suitable for air)....

Thanks! Fan area mesh is usual tetra, but there are no problems with fan volumes. I attached the axial section of fan volume mesh. Fan pressures are monitored and they are good, around what they should be. I used fan model before, including this case with k-epsilon, it's commonly OK (I described res...

I tried to stabilize the RSM calculation with artificial viscosity. It worked, so thanks for the hint. For air at room temperatures viscosity multiplier of 500 is appropriate. Target CFL of 1.0 + Upwind is OK. But it only helps with artificial viscosity. When viscosity is set back normal, calculatio...

Hello. I tried to reduce maximum fan pressure (at zero flow) from 3000 to 500 Pa and enabling pseudo-coupled velocity pressure solver. It didn't help, divergence starts almost at the same iteration (23). Target CFX is 1.0 now but 0.1, as I described, also didn't solve the problem, as well as relaxat...

Thanks for your support. That problem with error was due to insufficent memory. I checked memory usage during the run and it used almost all memory (so when there was some memory occupied before reboot there was no enough memory to run RSM case). The same was for 41M mesh with k-epsilon... It's OK, ...

Hello, thanks for your response. I have no time now for deep analysis of the problem, sorry. But it's OK to use an old gradient reconstruction option. I have another question related to this topic. With both meshes (whole domain + "All adjacent" gradient option or partial geometry + "...