Time-domain simulations of the acoustic streaming produced by a propagating wave radiated by a circular piston

Results of numerical simulations of the sound field produced by a circular piston in a rigid baffled are presented. The aim was to calculate the acoustic streaming and the flow of mass generated by the sound field. For this purpose, the classical finite-difference time-domain method was implemented, and the complete equations of conservation of mass and conservation of momentum were used together with the state equation for and adiabatic process in and ideal gas. Thermal effects were neglected to simplify the problem. The obtained numerical results illustrate the applicability of the method. The simulations show that a net flow of mass is produced along the axis of the piston, which correspond to the jet-like wind effect in a beam of sound.