code_saturne User's Forum

Hello,

Just in case we have a bug there (as it is less tested), could you try to tun in pure MPI mode (for example 12 to 16 MPI ranks, one thread per rank) instead of hybrid mode as you did here ?

Otherwise, I will try to find new ideas for tests to understand this behavior.

Best regards,

Yvan

Hello, The fact that I get divergence while you do not needs to be investigated, though doing so on a smaller mesh would be easier... I may try some options reducing the influence of the mesh partitioning (such as replacing the multigrid preconditioner for the pressure correction with a simple Jacob...

Hello, Yes, there was a mixup in 2 indices in the forces array. Also, yes, the surface is accounted for in the face_normal. So what I do not understand is why you get so different results ? As I said, using your original file, I got divergence, which you did not observe. The difference between havin...

Hello, Converting the MED file from a local build of convert2syrthes on my machine (with an older Syrthes 4.3), I get a Solid.syr file with the same number of elements, the same coordinates, but completely different element to node connectivity than what you get with the system MED libraries. Even w...

Hello, Yes, this seems strange, especially as code_saturne may be a bit less robust than Star-CCM+ regarding some meshes, but usually gives results quite similar to OpenFoam, FLUENT, or Star-CCM in most comparisons to date. If you have a second (even coarser) mesh, comparing results with that mesh c...

Hello, Looking back at your original post, - using libmedc from repository (it's loaded if I don't source syrthes.profile) - result: no error messages but the syr file is probably broken (syrthes complains about degenerated elements of mesh) might be a good place to start. What does Syrthes say whan...

Hello, If the code written by someone else is only user-defined code, it should work in v7.0.6. If other functions are modifed, than it is a derivative version and it is best to stay on the same release (but the "someone else" should handle the support aspect in this case, and if they are ...

Hello,

Are you sure your computation is converged ? Using your setup and an smooth wall, I have divergence right away. With a smaller reference time step and local time step, I can get results, but have not checked for convergence or looked in detail yet.

Regards,

Yvan

Hello, Thanks for the test case. I'll try to give it a look, but will probably need help from colleagues who know some of the numerical aspects better. Regarding the drag, a colleague pointed out to me a few days ago that there is a turbulence model related term which is added in all cases and shoul...

Hello, The error seems to be when downloading MED, so is the same as that described in this post : https://www.code-saturne.org/forum/viewtopic.php?t=3159. You can try the solution given there, or download MED manually. Also, why install v7.04 instead of v7.0.6, the latest bug-fix release for that b...