風洞における流れ場及び空力騒音に関する数値解析

抄録

Numerical analysis was performed to simulate the flow field and predict the aerodynamic noise in an open type small scale wind tunnel. The numerical scheme was based on Lattice Boltzmann Method (LBM) and the direct method was introduced to predict the aerodynamic noise. Large Eddy Simulation (LES) with the wall function was used for the turbulence modeling. As a result, the velocity distribution on the cross-section of the main jet obtained by numerical analysis was in good agreement with the experimental result. The vortex ring of the discharge nozzle shape was reproduced. The generated vortex ring splits into the small one while going downstream. The spectrum of aerodynamic noise was also predicted. Comparison of the numerical and experimental results shows that the numerical analysis is an effective design tool for the development of low-noise wind tunnel and can be applied to the development of various low-noise products.