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-   -   Porous + Natural Convection (http://www.cfd-online.com/Forums/fluent/40587-porous-natural-convection.html)

Alex April 15, 2006 06:44

Porous + Natural Convection
 
Has anybody worked on Natural Convection in infinite porous media by FLUENT?

Thanks in advance.

Evan Rosenbaum April 17, 2006 12:30

Re: Porous + Natural Convection
 
We've done natural convection in finite porous media. How would you proposed to model an infinite medium (maybe with symmetry or periodicity)?

Alex April 17, 2006 12:52

Re: Porous + Natural Convection
 
Dear Evan, thanks for your reply.

I have a vertical plate with a hotter temperature than the ambient. I have modeled this by pressure boundary conditions (Inlet and outlet). But the results are not satisfactory. I also have reversed flow in my boundaries.

Please help me.

Evan Rosenbaum April 18, 2006 12:23

Re: Porous + Natural Convection
 
First, don't use Boussinesq. Either use ideal gas or define a temperature dependent density.

Second, if you are modeling a vertical flat plate in an infinite medium of fluid, move your pressure boundaries further away from the plate.

Third, are you including turbulence? If the plate is hot enough and/or long enough there may be turbulent flow. If you are using wall functions, switch to the enhanced wall treatment.


Andr April 21, 2006 05:47

Re: Porous + Natural Convection
 
Hello!

I have to solve a model with porous zone. It's my first model with porous zone. I can't determine boundary conditions for this solve. My model has three volums: Volume 1 - gas volume (fluid) Volume 2 - porous volume (porous) Volume 3 - gas volume (fluid)

I don't know as I can realize boundary conditions on boundary surfaces between gas volume and porous volume. There are two concurring surfaces between gas and porous volumes. Whats boundary conditions I must realize on this surfaces? Sorry for my bad English. Thank you for the answer. Andrew.



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