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-   -   Defining Viscous and Inertial Resistance Coeff.s (http://www.cfd-online.com/Forums/fluent/28674-defining-viscous-inertial-resistance-coeff-s.html)

sean July 4, 2001 11:32

Defining Viscous and Inertial Resistance Coeff.s
 
My model involes a porous media fluid. The Fluent manual shows how to deduce the inertial resistance coefficient. However, no information is given about the former.

Somebody help me.

sean

Christian July 5, 2001 02:37

Re: Defining Viscous and Inertial Resistance Coeff
 
Can't you calculate it from Darcy's law (the permeability) ?

Christian

Flav July 12, 2001 05:02

Re: Defining Viscous and Inertial Resistance Coeff
 
If you know the pressure drop of the fluid in the porous media at several given flowrates, you can find the 2 coeff. dP/dx = A*Vē + BV

V can be easily deduced from the flowrate. dP is the pressure drop. dx is the thickness of the porous media.

With Excel you can then easily plot dP/dx = f(V).

Then you can find A and B.

Afterwards you can compute the viscous and inertial coeff. to put into Fluent : C2 = 2*A/rho 1/alpha = B/nu (nu=dynamic viscosity)


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