porous media in openfoam

aban · July 28, 2012, 13:53

i need to simulate the performance of catalytic convertor, hence i used poorousSimpleFoam as the solver in openFoam and inside the convertor i modelled as porous.
to know more about porous media i referred file named "porous media in openFoam"
but know i am little confused of the equation for source term in momentum equation
Si=-(μDij+1/2 ρ|Ukk|Fij)Ui
what does the term D and F represents.
the file is available herehttp://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf
http://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf

ngj · July 28, 2012, 16:58

Good evening Aban

Dij and Fij are tensors of rank 2, which defines the flow resistance for the terms being linear and quadratic in the flow speed respectively. The main task is to give physical relevant coefficients.

Furthermore, Dij and Fij are given a rotation so the flow resistance is aligned with the local coordinate system, which is defined in the porousZone dictionary. The details on the rotation are given in the PDF, which you link in the thread.

Good luck

Niels

July 28, 2012, 13:53	porous media in openfoam	#1
aban New Member aban Join Date: Apr 2012 Posts: 15 Rep Power: 14	i need to simulate the performance of catalytic convertor, hence i used poorousSimpleFoam as the solver in openFoam and inside the convertor i modelled as porous. to know more about porous media i referred file named "porous media in openFoam" but know i am little confused of the equation for source term in momentum equation Si=-(μDij+1/2 ρ\|Ukk\|Fij)Ui what does the term D and F represents. the file is available herehttp://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf http://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf

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July 28, 2012, 16:58		#2
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Good evening Aban Dij and Fij are tensors of rank 2, which defines the flow resistance for the terms being linear and quadratic in the flow speed respectively. The main task is to give physical relevant coefficients. Furthermore, Dij and Fij are given a rotation so the flow resistance is aligned with the local coordinate system, which is defined in the porousZone dictionary. The details on the rotation are given in the PDF, which you link in the thread. Good luck Niels