Pressure
Use the Pressure node to specify the pressure on a boundary. In many cases the distribution of pressure is known, giving a Dirichlet condition p = p0 where p0 is a known pressure given as a number, a distribution, or an expression involving time, t, for example.
Pressure
Enter a value or expression for the Pressure p0 (SI unit: Pa). Enter a relative pressure value in p0 (SI unit: Pa).
For the Subsurface Flow Module, the Pressure node provides the pressure P0 as a condition on edges in 3D models. Then select the edges under Edge Selection.
Constraint Settings
To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box.
As an attribute to the Fracture boundary condition or as boundary condition to The Fracture Flow Interface (which are available in the Subsurface Flow Module and the Porous Media Flow Module), the pressure can also be specified on edges (in 3D) or points (in 2D) surrounding the fracture domain. In other cases, pressure constraints on edges or points are not implemented.
If the boundary condition is adjacent to an Unsaturated Dual Permeability Medium feature it constrains the pressures in the Macropores and Micropores to p0.