This subfeature is available when both the Mass transfer in porous media mass transfer check box and the
Convection check box are selected in the
Settings window for the physics interface.
Select the Specify dispersion for each species individually check box to specify the dispersion tensor
DD (SI unit: m
2/s) for each species separately. When not selected the same dispersion tensor
DD is used for all species.
Select Dispersivity to specify the dispersion in terms of dispersivities (SI unit: m). Select an option from the
Dispersivity model list:
Isotropic (the default) or
Transverse isotropic based on the properties of the porous media. For isotropic porous media, specify the longitudinal and transverse dispersivities. For transverse isotropic porous media, specify the longitudinal, horizontal transverse, and vertical transverse dispersivities.
For User defined, specify the dispersion components in terms of constants or expressions. Select
Isotropic,
Diagonal,
Symmetric, or
Full to enable the appropriate tensor components.