Search found 4100 matches
- Mon May 13, 2024 8:41 pm
- Forum: code_saturne usage
- Topic: Convergence issues with CGNS mesh from Star-CCM+
- Replies: 3
- Views: 64
Re: Convergence issues with CGNS mesh from Star-CCM+
Hello, The residuals definition might vary from code to code, so its interpretation also. The definition used is in https://www.code-saturne.org/documentation/8.1/doxygen/src/cs_ug_output.html, at "Analyzing the output/Checking the convergence". Even on a "converged" computation,...
- Sun May 12, 2024 8:29 pm
- Forum: code_saturne usage
- Topic: Cannot use TVD schemes
- Replies: 9
- Views: 123
Re: Cannot use TVD schemes
Hello, Yes, Getting the right combination is a bit tricky, and compatibilty tests are done too late (it would be much simpler if the combination was tested after the setup stage, and options such as slope test possibly adjuster automatically). In v8.1, I added the possibility of choosing NVD schemes...
- Sat May 11, 2024 10:06 pm
- Forum: code_saturne usage
- Topic: Question related Code_Saturne recommandation
- Replies: 1
- Views: 311
Re: Question related Code_Saturne recommandation
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
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
- Sat May 11, 2024 10:04 pm
- Forum: code_saturne usage
- Topic: Convergence issues with CGNS mesh from Star-CCM+
- Replies: 3
- Views: 64
Re: Convergence issues with CGNS mesh from Star-CCM+
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...
- Sat May 11, 2024 8:03 pm
- Forum: code_saturne usage
- Topic: Dimensionless heat flux
- Replies: 1
- Views: 109
Re: Dimensionless heat flux
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...
- Wed May 01, 2024 6:50 pm
- Forum: code_saturne usage
- Topic: Condensation and moisture simulation
- Replies: 1
- Views: 502
Re: Condensation and moisture simulation
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...
- Wed May 01, 2024 6:45 pm
- Forum: code_saturne usage
- Topic: Neumann condition for temperature in only one direction
- Replies: 12
- Views: 2296
Re: Neumann condition for temperature in only one direction
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...
- Tue Apr 30, 2024 7:27 pm
- Forum: code_saturne usage
- Topic: user-defined functions
- Replies: 7
- Views: 1634
Re: user-defined functions
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
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
- Mon Apr 29, 2024 10:26 am
- Forum: code_saturne usage
- Topic: Turbulent Channel Flow with Periodic Boundary Conditions
- Replies: 1
- Views: 537
Re: Turbulent Channel Flow with Periodic Boundary Conditions
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...
- Sun Apr 28, 2024 10:00 pm
- Forum: code_saturne usage
- Topic: Neumann condition for temperature in only one direction
- Replies: 12
- Views: 2296
Re: Neumann condition for temperature in only one direction
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...