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how to calculate the porosity flow rate?

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Old   December 15, 2014, 15:06
Default how to calculate the porosity flow rate?
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Hello I need fast help and unfortunatly i found nothing in my search (thats is unusual ). My solution doesn't work.

My case is incompressible and isothermal. I have a porous zone where I want to calculate the porosity more or less so that I get a certain flowspeed in that area.

I took the equation from the Darcy Forchheimer header file.

S = - (mu*d + 0.5*rho*U*f)

I assumed that S is a force and flow only flows in one direction so I took the U into the brackets.

So I thought about setting d to zero and using a bernulli equation to substitute S.

S = - deltaP * A =- 0.5*rho*(U-U_after)*A

After substituting this I relocated it to f:

f = A*(1-U_after/U)

But it doesn't work. The values are to low. So what all do I wrong.

Thanks for every help!
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