# Porous + Natural Convection

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 April 15, 2006, 07:44 Porous + Natural Convection #1 Alex Guest   Posts: n/a Has anybody worked on Natural Convection in infinite porous media by FLUENT? Thanks in advance.

 April 17, 2006, 13:30 Re: Porous + Natural Convection #2 Evan Rosenbaum Guest   Posts: n/a We've done natural convection in finite porous media. How would you proposed to model an infinite medium (maybe with symmetry or periodicity)?

 April 17, 2006, 13:52 Re: Porous + Natural Convection #3 Alex Guest   Posts: n/a 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.

 April 18, 2006, 13:23 Re: Porous + Natural Convection #4 Evan Rosenbaum Guest   Posts: n/a 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.

 April 21, 2006, 06:47 Re: Porous + Natural Convection #5 Andr Guest   Posts: n/a 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.