Porous media

Homogeneous porous media are modeled by the addition of a momentum source term, ${\mathit{S}}_{pm}$, to the fluid momentum equation.

$${\mathit{S}}_{pm}=-\frac{{\mu }_f}{C_1}{\mathit{u}}_f-C_2\frac{1}{2}{\rho }_f|{\mathit{u}}_f|{\mathit{u}}_f$$

${\mu }_f$, ${\rho }_f$, and ${\mathit{u}}_f$ are the fluid viscosity, density, and velocity and $C_1$ and $C_2$ are user defined constants.

The following inputs are defined using the pm prefix.

	Description	Type	Default
regions	Regions used to define porous media.	String	None
[region].volfrac	Solids volume fraction of the porous media region.	Real	None
[region].c1	Porous media permeabilty constant for the source term in fluid momentum equation.	Real	None
[region].c2	Porous media inertial resistance factor for the source term in fluid momentum equation.	Real	None
[region].allow_particles	Allow particles to flow through the porous media region.	Int	0