Dynamic Mesh Method for Two-Dimensional Synthetic Jet

A numerical simulation method using dynamic mesh for two-dimensional synthetic jet flow was developed, in which dynamic mesh conservation equations and spring-based smoothing method were used. A computing model of an isolated jet to validate this method, the max velocity of oscillation is 0.47 m/s, Renault number is 180 and the Strouhal number is 0.056. The simulation results of different phases show that a shear layer is formed at the orifice edge and the shear layer rolls up to form a vortex ring, then fluid nearby the orifice enters into the cavity, and the vortex pair moves away from the orifice under its own momentum when the membrane moves to the bottom position. The suction process is affected by the outside vortex ring, and the second vortex pair impacts acutely the vortex ring outside. Comparing with other similar examples, the results show that the flow structure and action mechanism of synthetic jet flow are reasonable, and therefore this method could be used to simulate two-dimensional synthetic jet flow.