Three-Dimensional Large-Eddy Simulation of Turbulent Synthetic Jet

In this study, we apply the large eddy simulation (LES) model along with the immersed boundary method (IBM) and the arbitrary Lagrangian-Eulerian method (ALE) to simulate the evolution of the synthetic round jet. The model is a three-dimensional incompressible flow simulator, which is capable of resolving the detailed turbulent flow field. We use the IBM to capture the effect of the solid surface. Compared to the traditional body-fitting methods, IBM applies the body force to satisfy the desired boundary conditions. It can efficiently handle the complex geometry in Cartesian coordinate system. In addition, we apply the ALE method which calculates the grid velocity of the moving boundary. The present numerical model is then validated against the experimental results. In addition, another simulation case that directly applies the measured velocity field at the jet orifice as the inlet boundary condition is conducted for a detailed numerical observation of the turbulent synthetic jet. Aspects in numerical setup to obtain the agreement with the experimental data are discussed. Moreover, simulated turbulent flow fields are carefully examined.