Prediction of the acoustics field characteristics generated by a Rod-Airfoil configuration

In this paper, Large Eddy Simulation (LES) solver was used to get the accurate flow field details of rod-airfoil configuration with high quality structure mesh. Then, combined the Ffowcs Williams-Hawkings equation and used Finite Element Method (FEM) to predict the Far-field radiation noise in frequency domain. The flow field prediction results are in good agreement with the experiment, and the feature frequency of Karman vortex is consistent with the theory formula calculate. At the same monitoring point, the feature frequency of spectral peaks and the sound pressure level curve shape correspond well with the experimental data. The sound field has obvious dipole characteristics. The investigation results show that the frequency spectrum can be well predicted only by considering the effect of the wall dipole provided by LES method in low-speed incompressible flow. Using LES to predict the flow field for calculating far-field radiation noise can reach the engineering accuracy.