Impose Porous
Introduction
Impose porous definition follows the well-known Darcy-Forchheimer model and allows for definition of volume averaged isotropic or non-isotropic porous media.
Description
- PARALLELEPIPEDPOROUS
- CYLINDERPOROUS
Porous Region
It is generally assumed (default) that the principal axes of the porous region align with the base simulation X, Y, and Z coordinates (inertial reference frame). If that is not the case, a separate coordinate system can be defined and the values defining porosity will be considered in that new coordinate system.
There are two parameters which define the volume averaged porosity of the region:
porous_inert - This command defines the diagonal inertial coefficients in the Darcy-Forchheimer porosity model. If the values of this vector are all set to 0.0 and all the components of porous_visc are set to non-zero, then the used porosity model effectively becomes the Darcy model/equation. Given that nanoFluidX supports non-isotropic porous media, this coefficient is a 3-component vector value of the form X Y Z.
porous_visc - This command defines the diagonal inertial component coefficient in the Darcy-Forchheimer porosity model.
Given that nanoFluidX supports non-isotropic porous media, this coefficient is a 3-component vector value of the form X Y Z.
Start Time / End Time - Specifies the start and finish times which define the window where the impose region is active.
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Moving body motion to follow - Impose regions can follow a MOVINGWALL phase with a predefined motion.
Other Options - A free text box where additional parameters can be specified.