The Cylindrical Wave Radiation node adds a radiation boundary condition for a cylindrical wave, for which you define the source location and the source axis direction. If required, from the Physics toolbar, add an Incident Pressure Field to model an incoming wave. This radiation condition allows an outgoing cylindrical wave to leave the modeling domain with minimal reflections. The geometry of the modeling domain should be adapted to have the outgoing cylindrical waves coincide with the boundary. This is in order to minimize spurious reflections.Enter coordinates for the Source location r0 (SI unit: m) (the defaults are 0 m) and the Source axis direction raxis (dimensionless) (the defaults are 0).