code_saturne User's Forum

Hello,

1) We assume that for a pseudo-steady computation, h and temperatures will all stabilize, so the flux expressed as "h(Tw-Tf)" should stabilize. Ideally, in a linear wll law region in a mesh convergence study, the flux should reach a fixed value (assuming wall law computation is also ideal ...

Hello,

Yes, for 1), you should have equilibrium at the steady state. The lower the conductivity h, the higher (Tw-Tf) will need to be to obtain a given flux, the steady solid temperature will be higher if h is lower, lower if h is higher.

For 2), for a steady solution, convergence will often be ...

Hello,

The method used in this coupling (and the coupling with the newer code_saturne external thermal solver based on the CDO numerics) is as follows :

At each time step :
- The solid solver (Syrthes or code_saturne solid domain instance) sends a solid wall temperature.
- The fluid solver (code ...

Hello,

Yes, cs_user_boundary_conditions.cpp

Best regards,

Yvan

Hello,

Restarting with a change in model should work in theory, but a strong variation in computed values can lead to divergence in some cases.

First, did you check that the combustion case does not diverge if you run it for a few time steps directly (i.e. not as a restart) ? If this is OK, you ...

Hello,

If you want to replace "cs_real_t prdtur = 1;", since it is a local definition, a user-defined file will not be enough.

You can try using the modified source code file as a user-defined file, but I am not sure whether this will work or lead to link-time issues. It did work in most cases ...

Hello,

The slope test does not need to be toggled, as it adjusts to the scheme.

It seems the setting is disabled whenever you are using an LES turbulence model, because in this case a sencond(order scheme is required. In practice though, we seomtimes recommend adding 2% upwind (perhaps even) to ...

Hello,

If you still avec access to the build directory, you could edit the source code to apply the patch, then got to the build directory and simply re-run "make install".

Otherwise you may try to include the fixed file with user-define files, but you may have link issues related to multiply ...

Hello,

This seems to be due to an incorrect handling of reducers, fixed in commit 5de8c9.

So updating the code should fix hte issue (v9.1 was released Dec 30, so this is a good option).

Best regards,

Yvan

Hello,

The iprofc array was removed in commit 8edbd699(2023-03-29), with the following message:

[Atmo] Chemistry, remove iprofc array.

It was use to specify that we want to use chemistry profile for inlets.
This can already be done by specifying another value in
cs_user_boundary_conditions ...