Search found 4229 matches

by Yvan Fournier
Tue Jun 17, 2025 12:40 pm
Forum: code_saturne usage
Topic: MPI Error with CS/Syrthes coupling
Replies: 2
Views: 20

Re: MPI Error with CS/Syrthes coupling

Hello,

Are you sure your code_saturne and Syrthes builds use the same MPI installation ? Mismatched MPI libraries could explain the observed behavior. Since the Syrthes install script builds its own MPI library by default, this could happen if you are not extra careful.

Best regards,

Yvan
by Yvan Fournier
Tue Jun 17, 2025 12:33 pm
Forum: code_saturne usage
Topic: Restart save frequency
Replies: 7
Views: 5458

Re: Restart save frequency

Hello,

Not by default, but if you use the cs_restart_set_n_max_checkpoints function in.your settings (in cs_user_parameters) you should be able to do this (with an additional subdirectory per checkpoint time).

Best regards,

Yvan
by Yvan Fournier
Tue Jun 17, 2025 12:27 pm
Forum: code_saturne usage
Topic: fortran routine for v8
Replies: 1
Views: 35

Re: fortran routine for v8

Hello, You can use iso_c_bindings to provide a C API to your Fotran code, and call that from the standard C user function. If your Fortran code does not depend on too many internal code_saturne structures, or those can be passed as arguments, this should even continue to wrk after v9.0. If you use m...
by Yvan Fournier
Fri Jun 13, 2025 6:30 pm
Forum: code_saturne usage
Topic: Question about the convergence of LES calculations
Replies: 3
Views: 818

Re: Question about the convergence of LES calculations

Hello, Sometimes, just a few pinched cells can cause issues, but It is hard to tell without looking at your mesh. Would it be feasible an LES on a simpler mesh, or a truncated version of this one in which you have only the "good" cells, to see if this works better, or if the issue is relat...
by Yvan Fournier
Thu Jun 12, 2025 12:24 pm
Forum: code_saturne usage
Topic: Question about the convergence of LES calculations
Replies: 3
Views: 818

Re: Question about the convergence of LES calculations

Hello, What type of meshes do you use ? LES in code_saturne can be quite sensitive to mesh quality and regularity. In a similar way, though centered convection schemes are needed for the conservation of energy, a very small portion of upwind (2%) might help stabilize the computation. Best regards, Y...
by Yvan Fournier
Thu Jun 12, 2025 1:57 am
Forum: code_saturne usage
Topic: y+ value for k-e wall function with high roughness
Replies: 2
Views: 961

Re: y+ value for k-e wall function with high roughness

Hello, The guidelines are a good starting point, but need updating, and do not take into account some newer options such as the all-y+ law (in k-omega) or low-Reynolds models. I do not think they were written with the rough law model in mind, as the roughness adds an amount of user modeling, and the...
by Yvan Fournier
Tue Jun 10, 2025 1:30 am
Forum: code_saturne usage
Topic: SIGSEGV signal issue
Replies: 1
Views: 1079

Re: SIGSEGV signal issue

Hello, It is not possible to determine whether this is due to an issue in the code or in you user-defined functions, so you need to: - ideally, run this under under a debugger on your side, to get more details - otherwise, post you user-defined files. Also, v7.0.2 is not up to date, so you should up...
by Yvan Fournier
Fri Jun 06, 2025 12:20 pm
Forum: code_saturne usage
Topic: Groundwater Module - Neumann Boundary Condition Issue
Replies: 1
Views: 1508

Re: Groundwater Module - Neumann Boundary Condition Issue

Hello, Do you also have some user-defined functions ? Checking with a colleague developing this, your Van Genuchten ks value seems a bit high (in clay, it would be closer to 1e-2 or lower). Also, the groundwater module used in the v8.0 GUI is obsolete, and replaced by the CDO-based module in v9.0. (...
by Yvan Fournier
Tue Jun 03, 2025 10:46 pm
Forum: Discussion
Topic: K-omega documentation and initialization
Replies: 1
Views: 2297

Re: K-omega documentation and initialization

Hello, The level of detail in the theory guide is unfortunately far from uniform, and some subtle implementation differences in turbulence models might not be documented (or the matching elements may be spread out over many technical reports, bugtracker issues, ... or change logs, which makes it bas...
by Yvan Fournier
Wed May 28, 2025 6:17 pm
Forum: code_saturne usage
Topic: defining boundary condition on user selected interior faces
Replies: 3
Views: 3531

Re: defining boundary condition on user selected interior faces

Hello, If faces are joined for periodicity, they become interior faces, so should be selectable as interior (not boundary) faces. Combining periodicity and boundary face insertion would be another matter, as periodic faces are interior faces but one of their adjacent cell is a ghost cell, without an...