Use the Pressure (Adiabatic) node to specify a prescribed pressure
pbnd, that acts as a pressure source at the boundary, typically an inlet or outlet. In the frequency domain,
pbnd is the amplitude of a harmonic pressure source. The adiabatic condition states that no heat flows into or out of the boundary:
Enter the value of the Pressure pbnd (SI unit: Pa) at the boundary. The default is 0 Pa.