CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)

 july March 5, 2002 09:03

Porous media...

hi... I've to simulate an homogeneous porous media its permeabilty K= 1.7E-11 [m2] Does anybody suggest to me how i have to set up the alfa and beta permeabilty coefficient ? thanks

 Jing March 6, 2002 11:28

Re: Porous media...

They are functions of : volume porosity, molecular viscosity, density and the mean diameter of the particle in the porous. The detailed equations are listd in the manual, you can just use them.

Re: Porous media...

hi I am dealing with the same subject using fluent5.5. but the problem fluent can not present velocity distribution in packed bed.so my question is does Star-CD present velocity disribution in packed bed? and which model they used to solve momentum equation? I look forward to hear from you shortly with best regards A.S.Adam

 july March 12, 2002 03:57

Re: Porous media...

I Adam ... I'll to tell you what i've got.. StarCD use a linearized form of permealbility function the equation is : -K U = grad P where K = alpha /V/ + beta where /v/ is the velocity magnitude... If you want simulate a porouos media you can use a soubroutine (sormom.f) which introduce sources in the momentum equation... the terms wich the subroutine introduces are two: s1 and s2: the source term id s=s1-s2 *U where s1 and s2 are user defined...

 john YL March 12, 2002 08:57

Re: Porous media...

In prostar, you can plot velocity distribution in the porous region. STAR uses Darcy's Law for the momemtum equation.

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