Compressible

The jet oscillation frequency is predicted by analyzing velocity time histories at the actuator exit. A linear relationship between the jet oscillation frequency and time-averaged exit nozzle Mach number is found. We calculated the Strouhal number and founds that it is constant with the Mach number for the subsonic oscillating jet and has an average value of St = 0.0131.

WENO schemes with Roe solver are more accurate than all other methods tested. High-order numerical techniques are required to capture small-scale vortical flow structures.