# Darcy's Law?

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 September 21, 2011, 11:52 Darcy's Law? #1 New Member   agdruid@gmail.com Join Date: Mar 2011 Location: Russian Federation Posts: 1 Rep Power: 0 Sponsored Links Hi, everyone, excuse me with my english and with my probably stupid question, and please help me, i use ansys cfx v. 12.1; i cant understand which eqations cfx is using when finding velocity of a fluid through porous media. it should be darcys law (i know it in this form): U = (K/mu)*grad(p) where U is actual velocity K is permeability tensor p is pressure mu is viscosity grad() is gradient but in darcy's law its necessary to know permeability tensor (or scalar, in isotropic model) to find velocity, and i set only porosity, and it seems, that permeability is used only in momentum loss model. so how it works, how it finds velocity without permeability. in cfx-pre help i found such formula U = -R^(-1)*grad(p), where R is resistance to flow, second rank tensor, U is actual velocity and with such string "you obtain an anisotropic version of Darcy's law, with permeability proportional to the inverse of the resistance tensor" its cool, but i dont set any resistance tensor or scalar and leave permeability blank empty, and i get velocity (superficial or actual, it is not important yet) so help me please, and i will return to reading trying and studyin)

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