In past several decades, vortex-structure interaction generated aerodynamic noise became one of the main concerns in aircraft\ndesign. In order to understand the mechanism, the acoustic analogy method combined with the RANS-based nonlinear acoustics\nsolver (NLAS) is investigated. The numerical method is firstly evaluated by the experiment data of the classic rod-airfoil model.\nCompared with the traditional analogy methods, the RANS/NLAS can capture the nonlinear aerodynamic noise more accurately\nwith lower gird requirements. Then different rod-airfoil configurations were simulated to investigate the aeroacoustic interaction\neffects. The numerical results are in good agreement with those of the earlier experimental research. It is found that the vortexshedding\ncrash to the airfoil is the main reason for the noise generation which is dependent on the configurations, distance, and\nflow conditions.
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