This subfeature is available only when Archie’s law is selected as the Electrical conductivity material parameter in the parent feature (for example, the Wave Equation, Electric node). Then the subnodes are made available from the context menu (right-click the parent node) as well as from the Physics toolbar, Attributes menu.

Use the Archie’s Law subnode to provide an electrical conductivity computed using Archie’s Law. This subnode can be used to model nonconductive porous media saturated (or variably saturated) by conductive liquids, using the relation:

By default, the Electrical conductivity σL (SI unit: S/m) for the fluid is defined From material. This uses the value of the conductivity of the material domain.

For User defined enter a value or expression. If another type of temperature dependence is used other than a linear temperature relation, enter any expression for the conductivity as a function of temperature.