Porous Matrix (Hygroscopic Porous Medium)
This subnode defines the properties of a porous medium filled with two phases in equilibrium: liquid water and moist air. The moisture transport occurs through vapor diffusion and convection in moist air, and convection and capillary flow in the liquid phase.
Porous Matrix Properties
First, set the Porosity, εp (a dimensionless number between 0 and 1), that uses by default the value From material. For User defined the default is 0.
Then, set the Permeability, κ (SI unit: m2), to specify the capacity of the porous material to transmit flow. For User defined select Isotropic to define a scalar value or Diagonal, Symmetric, or Full to define a tensor value and enter another value or expression in the field or matrix.
When a Porous Material node is defined on the domains where the Hygroscopic Porous Medium feature is active, the Porosity and the Permeability can be set in the Homogenized Properties section of the Porous Material node.
Location in User Interface
Context Menus
Ribbon
Physics Tab with Hygroscopic Porous Medium selected in the model tree: