LES와 음향학적 상사식을 이용한 원주 주위의 공력소음 예측에 관한 연구

In this study, we simulate the aerodynamic noise generated around a circular cylinder at Re=90,000 (Ma=0.2) by a uniform flow using the LES and FW-H model. The Subgrid-scale trubulent viscosity was modeled by a Smagorinsky model adapted to structured meshes. The results show that time-averaged value, C D is approximately 1.47 which is larger than the experimentally measured value of 1.32 by about 13%. there are the very small acoustic pressure fluctuation with the same frequency of the Karman vortex street compared with the pressure fluctuation around a circular cylinder. We have seen that it is difficult to obtain absolute SPL value predictions in 20 due to the need to estimate the correlation length of the turbulent flow structures in the spanwise direction.