How to model fluid-porous interface
 

Hi,

The fluid-porous interface boundary is difficult to set. The flow from the fluid layer cannot enter the porous layer no matter how I try.

I have tried defining the boundary as "internal", "interior" or "interface", but it just doesn't work. What type of boundary is suitable?

There is a function in Fluent called "grid interface", do I need to set them for fluid-porous interface? How can I set it?

thanks.

Re: How to model fluid-porous interface
 

Grid interface is only to use if you have two parts of a geometry which are not connected (only one adjacent fluid zone per interface side - but two coincident boundaries). If you can set a internal boundary (shared by two fluid zones) as "interior" it can not be used as an interface.

Are there any error messages when you define the boundary as interface/interior...?

Re: How to model fluid-porous interface
 

Hi CFD Friends,

I too have an some doubts related to interface colud u pls help me so that i wil be so gratefull to u. Pls can u give me ur mail id, so that i ask my queries friend.

With regards, Raghu

Re: How to model fluid-porous interface
 

Thanks Grisu,

I managed to model it with interior now. Do you ever use UDF to solve the solid temperature of porous medium? If you have, could you share with me a small or simple example?

My porous medium has permeability, K = 9.13e-8, therefore, the viscous resistance, D=1/K= 1.1e+7 with this viscous resistance, the flow in a fluid domain cannot enter the porous domain at all, I just wonder my computation is correct.

If I reduce the value of D, then the fluid manage to enter the porous medium. however, practically, it suppose to enter even with D=1/K= 1.1e+7.

Thanx

Re: How to model fluid-porous interface
 

Yoshi,

sorry - I have not used an UDF for this so far.

How is the shape of the flow domain - has the fluid the possibility to bypass/avoid the porous zone? If so, the resistance seems to be high enough to block the fluid (in reality of course you have capillarity effects, which are not included in the porous zone model).

Re: How to model fluid-porous interface
 

Raghu,

my email: wongkokcheong @ hotmail.com

Re: How to model fluid-porous interface
 

Grisu,

It a horizontal channel with jet inlet at the top. Then partically filled with a porous medium. The flow will somehow hit the porous medium..