# Defining Viscous and Inertial Resistance Coeff.s

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 July 4, 2001, 11:32 Defining Viscous and Inertial Resistance Coeff.s #1 sean Guest   Posts: n/a 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

 July 5, 2001, 02:37 Re: Defining Viscous and Inertial Resistance Coeff #2 Christian Guest   Posts: n/a Can't you calculate it from Darcy's law (the permeability) ? Christian

 July 12, 2001, 05:02 Re: Defining Viscous and Inertial Resistance Coeff #3 Flav Guest   Posts: n/a 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*V² + 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)