Use the Pressure Head node to specify the pressure head (instead of the pressure) on a boundary. It adds this boundary condition for the pressure head Hp= Hp0, where Hp0 is a known pressure head given as a number, a distribution, or an expression involving time, t, for example. The dimension of the pressure head is length (SI unit: m).

The Subsurface Flow Module license is required to use this boundary condition (see https://www.comsol.com/products/specifications/).

Enter a value or expression for the Pressure head Hp0 (SI unit: m). The default is 0 m.

To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box.