For a 3D single phase turbulent Air flow inside a partially filled channel with porous material, what kind of interface treatment does ANSYS Fluent use for the interface between a porous and a fluid zone by default?
I know there are different interface conditions such as The Ene, Levy and Sanchez-Palencia interface, The Beavers-Joseph interface, but i want to know which interface conditions does ANSYS Fluent use.
For the porous zone Forchheimer extended Darcy’s equation and the thermal equilibrium model have been employed and the flow has been considered as laminar flow, but for the fluid cell zone the flow is turbulent and RNG k-Epsilon turbulence modeling has been utilized.
Dear Farhad , do u get the answer about FLUENT porous-fluid interface treatment?
could you please share it for me? thanks
Lyu Kefeng
Yeah, of course.
No one answered this question here, so i asked this question on CFD-Online's forum. A user named LuckyTran gave me this answer:
"I don't think there is any special interface treatment.
When you select the laminar zone option, Fluent sets the turbulent production in that zone to zero. The variables (k, epsilon, etc.) are still transported through the laminar zone.
There is another option (accessed using TUI commands) that allows you to also set the turbulent viscosity to zero in the laminar zone. But again, they are simply transported.
The pressure drop due to the porous media is handled by adding an extra volumetric momentum sink. If you need a reference, refer to the user manual section on Porous Media Conditions (see 7.2.1-3).
There is only one momentum equation. Refer to my previous post for why there is only one momentum equation when you use a laminar zone option. Interface treatment is needed in general when you actually have two separate sets of governing equations. But that is not the case."
(the link for this discussion on CFD-Online's forum:
https://www.cfd-online.com/Forums/fluent/221063-porous-fluid-interface-treatment.html#post746058 )
I wrote my understanding from this statements for the reviewer, fortunately, he/she accepted it and here is our published paper:
Article Numerical Study of Enhancing Vehicle Radiator Performance Us...
I hope you find these helpful.
Best regards.
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