The Initial Values node adds initial values for the sound pressure, velocity field, and temperature variation. If necessary add more Initial Values nodes from the Physics toolbar to give initial values in, for example, other domains.

Enter values or expressions for the Pressure p (SI unit: Pa) (the default is 0 Pa), Velocity field u (SI unit: m/s) (the defaults are 0 m/s), and Temperature variation T (SI unit: K) (the default is 0 K).