code_saturne User's Forum

For 1), you told in your first answer that the 'h' coefficient varies during the simulation as a relaxation flux to micmic conservativity. I perfectly understand that the solid temperature at steady state varies with a fixed value for 'h', but I am going to use the "automatic" coupling with the ...

Thanks for your answer, Yvan. It helped a lot!
It appears the overcooling problem comes more from time-stepping than from the way the coupling is done. Nevertheless, I am still interested in understanding the heat transfer coupling, so unfortunately this will double the number of questions I want to ...

Hi there!

I am trying to reproduce numerically some experimental results : some metal bars are heated by Joule effect and cooled by surrounding air buoyancy.
Thus, I prescribe a heating field within the bars on the Syrthes side and couple the heat transfer simulation with the Code_Saturne solver ...

Hi !

I have successfully reduced the amount of instabilities by using "local time stepping" and increasing the reference time step.

This is very unusual to me: in my referential increasing the time step means amplifying the numerical instabilities. Is the time stepping explicit or implicit ...

Thank you Yvan for your fast answer and sorry for the missing attachement. I remember adding it to the post, but I certainly did not go all through.
Here is the screenshot at iteration 700, we can see the plume which has formed at the left heating bar (others have been deactivated), and the ...

Hello,
I am running a code_saturne simulation where 3 heating bars are embedded within a still air environnement. The only dynamics of the case is elevating air due to buoyancy at the heating bars.
For the Boundary Conditions, I have imposed a wall at the bottom and I wish to let the three (left ...

Here are the thermal Flux and Boundary_temperature at boundaries.

1. Why are these quantities given on the volumic mesh and not only at the boundary faces?
2. The input thermal flux is globally negative. Does it mean the heat is going from the fluid to the solid?
3. The heat exchange is not ...

Hello,

I am quite confused by the coupled Syrthes/Saturne result I get. I have a heating solid bar centered within a fluid domain. The solid bar is heated by Joule effect which I temporarily model by a handmade heating field.

What I am interested in is the thermal transfer between the solid bar ...

All right! I have been able to run the simulation by rearranging the <conjugate_heat_transfer> as:

<conjugate_heat_transfer>
<external_coupling>
<projection_axis>Z</projection_axis>
<syrthes_instances>
<instance name="SOLID">
<coupled_boundary label="Barre1_P1"/>
</instance>
</syrthes ...

Hi Yvan,
Thank you for your answer.
In my setup.xml Saturne's config file, I have the following section :

<conjugate_heat_transfer>
<external_coupling>
<syrthes>
<projection_axis>Z</projection_axis>
<selection_criteria>1</selection_criteria>
<syrthes_name>SYRTHES</syrthes_name>
<verbosity ...