code_saturne User's Forum

Hello,

I'll need to check with atmospheric model specialists, but i would assume you can simply change the viscosity in the GUI.

Best regards,

Yvan

Hello, The CGNS version detection workaround is available in v8.0, not v7.0, so with V8, you would not need to change the CGNS version. Otherwise, the mesh export seems OK. One issue with the mesh is that you have what looks like a viscous layer at the inlet and outlet, whereas this is useful only f...

Hello, If I remember correctly, this is an attempt at the estimation of the Nusselt Number. But contrary to the "real" Nusselt number which is based on a bulk temperature in a zone which needs to be chosen, this uses the near wall temperature (i.e. the temperare in the cell adjacent to a b...

Hello, I am not sure about this. There are some models involving condensation and moisture in the code, but those were developed in the context of specific models (such as cooling towers, or condensation on metal structures), but I am not sure there is a "high level" model, and documentati...

Hello, When behavior gets really strange like this, it probably means that there is some sort of error upstream of where the crash appears. When switching to v8.0, did you align the user-defined function ? There may be a change in the arguments (a tool such as meld can be useful for this). Otherwise...

Hello,

Yes the computation seems to diverge.
The code has a safety stop when velocity reaches 10000 m/s as that is out of physical bounds for incompressible flow, and stopping cleanly still allows for postprocessing.

Best regards,

Yvan

Hello, Regarding 1), cs_meg* functions are not user-defined functions. They are generated by the code based on the definitions in the GUI, so your changes will be overwritten. Use cs_user_initialization instead. Regarding 2), how much fluctuations do you have ? I am not sure you can get something co...

Hello, Using v7.0, you do not have direct access to "bc_coeffs->rcodcl3[face_id]", as this was added in v8.0 for better readbility. In v7.0, the equivalent for this is rcodcl[2 * n_b_faces * nvar + var_id*n_b_faces + face_id] = flux; (See last example in cs_user_boundary_conditions-noteboo...

Hello,

Simply select the boundary forces output in the Postprocessing/Surface Solution control section.

Best regards,

Yvan

Hello, I did not notice any obvious mistake, so assuming you boundary zone is indeed named "BC_1", and you replace the correct expression for the flux value, it should work. Note also that if you are using a constant flux value, you can use the GUI. Even with a more complex expression, you...