doubt in applying boundary condition

shaswat · February 10, 2012, 21:10

Dear friends

problem: Fluid is flowing through a multilayer porous pipe.

I know the boundary conditions for inlet which is pressure and outlet which is mass flow rate in the fluid domain

my question is:

How to define inlet and out let in the porous domain.

I assume in the porous domain as

inlet: Cartesian velocity components equal to 0
outlet : pressure equal to 0

Is my boundary condition correct?

Thank you

Regards

Shashwat

ghorrocks · February 11, 2012, 05:36

If that matches the experiment you are trying to model then probably, yes.

But it does seem weird to have a mass flow outlet on the main flow, but zero pressure at the porous outlet. Why is it different? If the flow is not significant in the porous material just put a wall there.

February 10, 2012, 21:10	doubt in applying boundary condition	#1
shaswat Senior Member Shashwat Join Date: Nov 2011 Posts: 107 Rep Power: 14	Dear friends problem: Fluid is flowing through a multilayer porous pipe. I know the boundary conditions for inlet which is pressure and outlet which is mass flow rate in the fluid domain my question is: How to define inlet and out let in the porous domain. I assume in the porous domain as inlet: Cartesian velocity components equal to 0 outlet : pressure equal to 0 Is my boundary condition correct? Thank you Regards Shashwat

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February 11, 2012, 05:36		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If that matches the experiment you are trying to model then probably, yes. But it does seem weird to have a mass flow outlet on the main flow, but zero pressure at the porous outlet. Why is it different? If the flow is not significant in the porous material just put a wall there.