Abstract
Large-Eddy Simulations (LES) are used to investigate the physical processes involved in the injection of a synthetic (zero-net-flux) jet into a zero-pressure-gradient turbulent boundary layer at conditions corresponding to experimental data obtained by others. The boundary layer ahead of the jet is generated by a separate precursor simulation at a momentum-thickness Reynolds number of Re θ=920, providing the main simulation with a full and accurate description of the unsteady conditions. Phase-averaged results and time-averaged integral quantities are presented and compared against experimental data. This main study is preceded by a simulation of a synthetic-jet injected into stagnant surroundings, mainly in order to verify the computational framework, but also to gain insight into the behaviour of the vortex rings injected through a square orifice, in accord with corresponding experimental conditions.
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