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-   -   Problem with rhoPorousMRFSimpleFoam and how to define porous media (http://www.cfd-online.com/Forums/openfoam/91059-problem-rhoporousmrfsimplefoam-how-define-porous-media.html)

Amit Mathur July 29, 2011 02:46

Problem with rhoPorousMRFSimpleFoam and how to define porous media
 
Dear All,
I am facing problem while running rhoPorousSimpleFoam solver in OpenFoam 2.0.x. I am trying to simulate pressure driven flows (Pressure is fixed boundary condition at inlet and outlet) in a simple pipe with porous zone. The K-Epsilon turbulence model is used. The solver is oscillating with higher values of epsilon on boundary. I am also facing problem in defining Porous media. If some one have some document regarding to that please send to me.
In some cases it runs by making so many changes in relaxation parameters etc. But the results are not validated, especially the pressure drop across the porous media both for isotropic and anisotropic cases. I am copying below the porous zone file defined for isotropic(homogeneous) porous media.


1
(
cellTable_8
{
coordinateSystem
{
e1 (0.90709 0.295279 0.299993);
e2 (-0.329827 0.033477 0.943447);
}

Darcy
{

d d [0 -2 0 0 0 0 0] (1.14e8 -1 -1);

f f [0 -1 0 0 0 0 0] (422.955 422.955 422.955);
}
thermalModel
{
type none; // fixedTemperature;

// fixedTemperature coefficients
T 350;
}
}

)

kalyangoparaju July 19, 2012 11:19

Amit,

Did you solve your problem.

I am assuming that you have a high relaxation factor for epsilon. Decreasing it might help. If not, try to change the initial values of epsilon.

Also, to crenate a porousZone from a mesh not built in foam, you need to create cellSet and then convert it to a cellZone using setSet function.

Kalyan

mech01 July 17, 2013 06:18

Meaning of value in porous zone file
 
Hi can any one tell me what is ment by 1 in porouse zone file. Is it default value of porosity. or it mean one cell zone or one block.

Thanks

Akshay July 18, 2013 00:57

Hi mech01

It is the latter.

mech01 July 18, 2013 05:05

Quote:

Originally Posted by Akshay (Post 440444)
Hi mech01

It is the latter.

Latter means its one block

Akshay July 18, 2013 05:23

Absolutely...it means you are defining only one zone i.e cellTable_8

mech01 July 18, 2013 06:57

Quote:

Originally Posted by Akshay (Post 440490)
Absolutely...it means you are defining only one zone i.e cellTable_8

Thank you Akshay


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