code_saturne User's Forum

Hello,

Please how can I define the free surface in the Code_Saturne to take into account the interaction "water / air" at this surface (see photo attached).

it's possible to make this coupling at the free surface on the code saturne.

thank you very much for your idea
(don't forget to look at the image attached)

Hello,

If the free surface does not move (no waves), a symmetry boundary condition is enough. If it does move, you need to add ALE deformation, but you have de define mesh motion correctly in this case.

Regards,

Yvan

Thanks Yvan,

If I apply the symmetry condition I'll get an interaction water / air?, I get drops of air in the bassin?

if yes, then this condition is enough for me ! for ALE, I do not know how to add it,

Yvan Fournier wrote:Hello,

If the free surface does not move (no waves), a symmetry boundary condition is enough. If it does move, you need to add ALE deformation, but you have de define mesh motion correctly in this case.

Regards,

Yvan

Hello,

No, if you apply symmetry, you get no interaction between water and air.

To get drops of water in the air domain would require another approach than continuum mechanics implemented in Code_Saturne, or at the minimum a multiphase approach with an appropriate model.

Regards,

Yvan

Thanks Yvan,

I think I have used the polyphasic approach (Euler-Lagrange) but I can't find any examples of this subject conducted by Code_Saturne.

What I have now is a coupling between two areas ( rotating and fixed areas) (Fig. above),but I don't know that they are subroutines to add to my SRC.1 to use the polyphasic approach!.

Please if you have an idea of ​​how to proceed, thank you for the past for me, and if there are examples in polyphasic on code saturne are welcome

Hello,

The only "polyphasic approaches" in Code_Saturne are the ones for combustion, which use specific models, so they won't help here (and in addition, I do not have examples that I could explain for those).

Regards,

Yvan

Yvan thank you,

So multiphase approach is not possible in my case!. For the ALE approach you have more details please.

Yvan Fournier wrote:The only "polyphasic approaches" in Code_Saturne are the ones for combustion

For the sake of completeness, let us mention the particle-tracking (Lagrangian) module of Code_Saturne to deal with polydisperse particulate turbulent flows

(of course, absolutely irrelevant when it comes to free-surface flows)

Hello,

To obtain the deformation of surface, we will activate the "ALE" module in the subroutine "usalin.f90"

"iale = 1"

But I get no surface deformation