This node may be added as a subnode to any species node. See also Common Settings for the Species Nodes in the Electrophoretic Transport Interface.

This node specifies the initial value for the Concentration, c (mol/m3), of the parent species. This value serve as the initial condition for a transient simulation. The value also serves as a start guess for stationary problems.

You can use spatially dependent functions (such as smoothed step functions) available under Definitions when defining the Concentration expression to specify different concentrations in different parts of the geometry. You can also use additional Initial Values node and modify the Selection to set different values for different domains.