code_saturne User's Forum

Hello,

The "upwind gradient SOLU" should be closer to the SOLU in the litterature.

The legacy "SOLU" uses a centered/regular cell gradients to reconstruct values at a face's I' and J' points.

Regarding the slope tests, from discussions with colleagues, the "second-order" aspect of SOLU could lead ...

Hello Cedric,

Not sure about phase-averaged statistics, but J-F Wald has been testing pseudo-sliding averages recently and has interesting results, so you might want to contact him. I'll also remind him to check this forum.

Best regards,

Yvan

Hello,

Note that v9.1 is not a fully validated version, so may have some bugs.

In any case, the first thing to try is to add at least 1 layer of extruded cells at the outlet (you can do this directly in code_saturne, see the preprocessing section of the GUI).

For outlet conditions, trying both ...

Hello,

Thanks for the feedback. This is now fixed in the master branch, an I'll fix it in v9.0 also if it appears there also.

Best regards,

Yvan

Hello,

Does the high pressure region appear along the whole axis of the pipe or closer to the inlet or outlet ? This might be due to a combination of inlet or outlet boundary conditions and gravity.

Can you try using a regular outlet instead of an imposed pressure outlet ? When using an imposed ...

Hello,

Coule you provide more information (pas per the forum usage recommendations) ?
Without any info on the code version, model used, type of mesh, setup, ... it is difficult to provide a relevant answer.

Best regards,

Yvan

Hello,

Boundary conditions in code_saturne may use coupled components for multi-dimensional fields, which is not the case for neptune_cfd. For scalars, coefficients should be similar.

I am out of office today (without my work computer) so cannot check the neptune_cfd code right away (and the rest ...

Hello,

Thanks for the feedback for the linear solver tolerance. This is a tricky subject, because the tolerance used is strongly related to the right-hand side normalization choice, and this has changed several tiles across code_saturne versions to try to have the "best" possible logic (i.e. be ...

Hello,

1) I am not sure how this is computed. I will check, but will probably not be able to look at this in detail before 10 days or so.

2) Without this parameter, I assume the risk is to have very strong variations in some matrix coefficients, but I am not sure we ever tested the feature without ...

Hello,

I would be surprised if we did not use a consistent momentum interpolation, though I am not an expert in that part of the code.

For 1), yes, the Fourier number may be involved in the time step computation for the fluid region. This may cause issues in some cases where turbulent models lead ...