code_saturne User's Forum

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...

Hello, If you are a beginner with the code, I recommend generating the boundary forces output simply by selecting it from the GUI. With user-defined functions, you can do additional filtering, summation, ... but you need to first have the matching field activated, which is not well documented (but c...

Hello,

I do not think there has been any new development in this regard, though there has been work on another compressible model which may have different constraints.

Did you try forcing the pseudo-steady algorithm using a user-defined function (I.e. cs_user_parameters) ?

Best regards,

Yvan

Hello,

Yes, you can use the prescribed flux condition in this case.

Best regards,

Yvan