Computational Analysis of Interaction of a Sweeping Jet with an Attached Crossflow

摘要

Computational-fluid-dynamics-based simulations are conducted to investigate the interaction of a sweeping jet generated by a fluidic oscillator with an attached turbulent crossflow. Improved delayed detached-eddy simulation is employed as a practical yet high-fidelity turbulence modeling approach to resolve the flow structures inside the oscillator's passages and in the crossflow region. The predicted flow generated by an oscillator with an outlet hydraulic diameter of 10 mm using air as a working fluid is validated against the particle image velocimetry data for two jet-to-freestream velocity ratios of 1 and 3. Close agreement is observed between the current numerical study and experimental data for the time-averaged and time-resolved flowfields at both velocity ratios. Formation of a pair of counter-rotating streamwise vortices is observed with a growth in its strength and size as the jet velocity increases. A greater penetration of the jet in both normal and lateral directions at higher jet velocity is also seen.