Numerical Analysis of Flow Field for Leading-edge Porosity Airfoil Based on LBM-LES Method

The leading edge porosity airfoil can effectively reduce the aerodynamic noise of the airfoil, but its influence on characteristics of the flow field needs further study. The LBM-LES method combines with the Lattice Boltzmann Method (LBM) and Large Eddy Simulation (LES) was used to numerical simulation the standard GAW-1 wing and leading edge porous GAW-1 airfoil at high Reynolds number Re=3.5×10⁶, the flow features at different angles of attack was analyzed and compared. Where D2Q9 model is used as particle velocity model and LES uses a dynamic Smagorinsky subgrid model to simulate turbulence. The results shows that LBM-LES method can accurately capture the flow separation characteristics of turbulent flow field under unsteady high Reynolds number and the numerical results can be well consistent with the experimental values. Moreover, the leading edge porous medium has little effect on the aerodynamic characteristics of the airfoil, and the influence on the aerodynamic characteristics increases with the increase of the angle of attack.