Use this node at domains that have Porous Matrix Properties, that is, porosity and tortuosity. Both the porosity and tortuosity (available depending on transport correction setting) are by default set to 1.

In the Effective Transport Parameter Correction section, the mass transport correction in the porous media is defined. The default correction is Bruggeman, which multiplies the diffusivity and mobility values by the porosity to the power of 1.5. Other available corrections are Tortuosity, User defined, or No correction.