code_saturne User's Forum

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

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...

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

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

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...

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...

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...

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...

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...

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. (...