# Setting up a porous media

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 June 25, 2010, 04:29 Setting up a porous media #1 New Member   Nicholas Join Date: Jul 2009 Posts: 13 Rep Power: 9 Hi all, I've been having some trouble setting up a porous media flow in Star-CD v4 through a porous baffle. I know the force () and hence the pressure drop across the baffle and I need to calculate and : where is superficial velocity and is fluid density (I assume). I seem to have too many unknowns, since I do not know the superficial velocity... any ideas would be greatly appreciated.

 June 25, 2010, 08:15 #2 Member   Oliver Lauer Join Date: Mar 2009 Location: Coburg Posts: 57 Rep Power: 9 But you know pressure drop for a given mass flow. And you now the area of your porous baffle, and the density. So you can calculate a mean velocity. Better would be to have pressure drops for more than one mass flow because you have two unknowns

 June 25, 2010, 10:32 #3 Senior Member   Pauli Join Date: Mar 2009 Posts: 185 Rep Power: 9 You have one equation with two unknowns. You need the force/pressure drop at two or more flow rates. Then you can curve fit the equation to the data.

 June 25, 2010, 10:42 #4 New Member   Nicholas Join Date: Jul 2009 Posts: 13 Rep Power: 9 I have one force value, but I don't have an associated flow rate for that force. How can I calculate the flow rate in the porous media?

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