Hello,
I meant that the choice of the roughness value can in itself be based on some user modeling choices. I was thinking mostly of the atmospheric cases where roughness can represent vegetation, which is accounted for in a simplified (i.e. modeled) way as a form of roughness.
Best regards,
Yvan
Search found 4231 matches
- Tue Jun 17, 2025 4:17 pm
- Forum: code_saturne usage
- Topic: y+ value for k-e wall function with high roughness
- Replies: 3
- Views: 1209
- Tue Jun 17, 2025 4:14 pm
- Forum: code_saturne usage
- Topic: MPI Error with CS/Syrthes coupling
- Replies: 4
- Views: 112
Re: MPI Error with CS/Syrthes coupling
Hello, I mean that Syrthes can compile its own OpenMPI library as an external dependency, but this does not seem to be the casde here. But you may be missing a setting in the syrthes-install/setup.ini file : you should have: ple_use=yes syrthescfd INSTALL=yes Otherwise, you will be missing the libsy...
- Tue Jun 17, 2025 12:40 pm
- Forum: code_saturne usage
- Topic: MPI Error with CS/Syrthes coupling
- Replies: 4
- Views: 112
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
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
- Tue Jun 17, 2025 12:33 pm
- Forum: code_saturne usage
- Topic: Restart save frequency
- Replies: 7
- Views: 5538
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
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
- Tue Jun 17, 2025 12:27 pm
- Forum: code_saturne usage
- Topic: fortran routine for v8
- Replies: 1
- Views: 110
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...
- Fri Jun 13, 2025 6:30 pm
- Forum: code_saturne usage
- Topic: Question about the convergence of LES calculations
- Replies: 3
- Views: 1008
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...
- Thu Jun 12, 2025 12:24 pm
- Forum: code_saturne usage
- Topic: Question about the convergence of LES calculations
- Replies: 3
- Views: 1008
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...
- Thu Jun 12, 2025 1:57 am
- Forum: code_saturne usage
- Topic: y+ value for k-e wall function with high roughness
- Replies: 3
- Views: 1209
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...
- Tue Jun 10, 2025 1:30 am
- Forum: code_saturne usage
- Topic: SIGSEGV signal issue
- Replies: 1
- Views: 1259
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...
- Fri Jun 06, 2025 12:20 pm
- Forum: code_saturne usage
- Topic: Groundwater Module - Neumann Boundary Condition Issue
- Replies: 1
- Views: 1653
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. (...