The Pressure node adds a mixed condition that acts as a pressure source/load at the boundary, which means a constant acoustic pressure
p =
p0 is specified. The condition is applied to the saturating fluid as well as the porous matrix. In the frequency domain,
p0 is the amplitude of a harmonic pressure source.
Enter the value of the Pressure p0 (SI unit: Pa) at the boundary.
) and select Advanced Physics Options in the Show More Options dialog box.