A comparison of the different subgrid-scale models and its application

Four different Subgrid-Scale models were employed in the study of flow over a wall-mounted hump and then the most capable one was used in flow control with the DBD plasma in this work. The results show that the WALE model and the KET model demonstrate good qualitative agreement with the experimental data The Smagorinsky-Lilly displays some shortage in the simulation, while more dissipations and the disability in capture the transition in the boundary layer are found in the WMLES model. A wall jet shows up in near wall region when the DBD plasma is applied in the flow. It would lead to the delay of the flow separation the happen of the reattachment in advance and the restraining of the spanwise vorticity Therefore, the DBD plasma actuator has been demonstrated to have the ability in dissipation decrease and turbulent drag reduction.