Research of the aeroacoustic noise simulation based on transition/scale-adapt model and FW-H equation

Combined the computational fluid dynamics (CFD) numerical simulation and the acoustics analogy method, the noise simulation on the multi-element airfoil of MD30P30N is presented. The CFD numerical simulation is used to compute the flow around MD30P30N multi-airfoil at the stall angle, and then the FW-H acoustics equation is combined to compute the aerodynamic noise. For giving the precise CFD result as the sound source, the scale-adaptive simulation of separate flow model which based on SST turbulent and the boundary transition simulation method which gives the coupling to γ-(Re_θt)̄ transition model and SST turbulent model are established. The scale-adaptive separate (SAS) flow model behaves the characters of the RANS method at the boundary layer. Based on the combination of the SAS model and the γ-(Re_θt)̄ transition model, the numerical simulation technique including transition and separation for the complex flow is constructed. With the RANS equation as the control equation, the full turbulent simulation through the γ-(Re_θt)̄ SST model and the simulation through the γ-(Re_θt)̄-SST-SAS transition model are used to compute the multi-element airfoil flow, respectively. The aerodynamic noise is computed through the FW-H equation based on the CFD solution. The results are analyzed at the aerodynamic view and the aerodynamic noise view, and several conclusions are given at the end of the paper.