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Defining Viscous and Inertial Resistance Coeff.s

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Old   July 4, 2001, 11:32
Default Defining Viscous and Inertial Resistance Coeff.s
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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.

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Old   July 5, 2001, 02:37
Default Re: Defining Viscous and Inertial Resistance Coeff
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Can't you calculate it from Darcy's law (the permeability) ?

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Old   July 12, 2001, 05:02
Default Re: Defining Viscous and Inertial Resistance Coeff
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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*V + 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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