A parametric investigation of jet and vortex actuator

The Jet and Vortex Actuator (JaVA) is a zero -net-mass flux device for active flow control. In this numerical study, we present a parametric study of JaVA in quiescent water and obtain time-averaged flow and vorticity fields. We systematically investigate the effect of the governing parameters that affect on the JaVA -induced flow characteristics. Three jet Reynolds numbers are investigated in detail; Re_J = 68, 150 and 250 and for each jet-Reynolds number, four different wide-slot to plate width ratios are considered: g_w = 0.0166, 0.0338, 0.066 and 0.10. In all cases, the scaled amplitude is kept at S_a = 0.15 and 0.30 so that a total of 24 different simulations are investigated. JaVA-induced flow types are classified in five groups: wall-jet, vertical-oblique jet, chaotic jet, weak jet and vortex mode. Based on the governing parameters (S_a, Re_J and g_w) all these flow types have been identified the jet-momentums are calculated from phaseaveraged jet velocities obtained from numerical modeling results and compared to each other. It is found that generally the vortex mode transports the highest momentum flux followed by a chaotic jet.