Large eddy simulation of sweeping jet using regularized lattice Boltzmann method

The sweeping jet (SWJ), typically emitted from a fluidic oscillator, is a highly regarded active flow control method. In this study, a regularized lattice Boltzmann method is considered to achieve large eddy simulation of the SWJ, and the classical Smagorinsky model, Vreman model, and wall adapting local eddy-viscosity (WALE) model are compared to calculate the subgrid eddy viscosity. By conducting tests on two typical instances of free jets and jets with wall interference, it is demonstrated that both the time-resolved and time-averaged characteristics predicted by three models are in excellent accordance with experimental measurements. Additionally, the influences of opening angle and oscillation frequency on flow structure, momentum transfer, vortex evolution, and mixing efficiency are examined. The findings reveal that the entrainment characteristic of the SWJ can be enhanced by increasing the opening angle. Nevertheless, the oscillation frequency (or outlet velocity) exerts a relatively limited impact on the outlet properties.