code_saturne User's Forum

Hello everyone,
I have a question about Boussinesq approximation.
I saw in the tutorial that we apply this approximation by defining the variations in density
But in the theory, i read that only the buoyancy term in momentum equation is effected and except this term, all variations in density are neglected (Does it mean that the fluid is incompressible ?)

So, we should apply this method by the change in density (via GUI) or the change in source term of momentum equation (via cs_user_source) ?

Thank you,

I run this tutorial

http://code-saturne.org/cms/sites/defau ... tyFlow.pdf

I hope it will help you

Thank you,

Hello, since version 6.0 there is an option to activate the Boussinesq approximation (indeed rho varies only in the buoyancy term and is supposed to be constant everywhere else).
Look for idilat = 0 in cs_user_parameter file.

Best Regards
Martin

roberto.bernetti wrote: ↑Wed May 08, 2019 10:06 pm I run this tutorial

http://code-saturne.org/cms/sites/defau ... tyFlow.pdf

I hope it will help you

Hello, I have tried to follow the steps in this tutorial, but I can not find the EXAMPLE in the file "cs_user_physical_properties.f90". I just want to figure out to how to programming the Boussinesq Model with User Coding. Thank you.

Hello,

The tutorial seems to have been only partially updated. The meshing/Salome aspects are up to date relative to Salome 8.x, but the text relative to user subroutines is not. We need to fix this, but in the meantime, following Martin's recommendation is the best solution (and simpler than the original tutorial solution). You will need version 6.0-beta as this feature was not available in v5.0.

Best regards,

Yvan

Thank you!