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Fluid-porous Boundary condition

Posted Mar 31, 2011, 4:13 p.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD) Version 4.0 3 Replies

Roohollah Sadeghi
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I'm working on modeling of porous media. I have two domains porous and fluid in the model. What’s boundary condition is proper in fluid-porous interface?
3 Replies Last Post Jul 25, 2011, 4:29 p.m. EDT
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Hello Roohollah Sadeghi

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Shriram Reguraman
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Posted: 1 decade ago Jul 19, 2011, 10:44 a.m. EDT
Hi Rooholla,

Have you been able to solve your prob?

I am working on a similar proj involving 2 porous domains, and was wondering how to give an interface BC?

Thanks.

Shriram
Hi Rooholla, Have you been able to solve your prob? I am working on a similar proj involving 2 porous domains, and was wondering how to give an interface BC? Thanks. Shriram
Philipp Fischer
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Posted: 1 decade ago Jul 19, 2011, 11:52 a.m. EDT
Maybe you could upload an example file, containing your problem.

My first guess would be the conservation of mass: Flux_left = Flux_right. I myself have a porous electrode bordering a gas channel. I've described both with the same PDE and altered the transport parameter in each domain:

Gas channel: Total velocity = some value; Diffusion coefficient = 0 --> Convection only
Electrode: Total velocity = 0; Diffusion coefficient = some value ---> Diffusion only

By the nature of the PDE, conservation is fulfilled.


Philipp
Maybe you could upload an example file, containing your problem. My first guess would be the conservation of mass: Flux_left = Flux_right. I myself have a porous electrode bordering a gas channel. I've described both with the same PDE and altered the transport parameter in each domain: Gas channel: Total velocity = some value; Diffusion coefficient = 0 --> Convection only Electrode: Total velocity = 0; Diffusion coefficient = some value ---> Diffusion only By the nature of the PDE, conservation is fulfilled. Philipp
Shriram Reguraman
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Posted: 1 decade ago Jul 25, 2011, 4:29 p.m. EDT
Yes, in comsol 4.0 there is a continuity boundary condition available under pairs, which takes care of the pressure and mass flux as you indicated to be continuous acorss the interface.

However, when I try to use this, I am unable to select the boundary.

Thanks.

Shriram
Yes, in comsol 4.0 there is a continuity boundary condition available under pairs, which takes care of the pressure and mass flux as you indicated to be continuous acorss the interface. However, when I try to use this, I am unable to select the boundary. Thanks. Shriram

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