Use the Pressure and Saturation node to specify the pressure and fluid volume fractions on a boundary. In many cases the distribution of pressure and saturation are known as numbers, distributions, or expressions involving time, t, for example.

Enter a value or expression for the Pressure p (SI unit: Pa), and for the Saturation fluid 1 s1 (a dimensionless number between 0 and 1). The default values are 0. The saturation of Fluid 2 is then calculated as s2 = 1 − s1.