Prediction of dipole sources and aeroacoustics field for tandem cylinder flow field based on DBEM/hybrid LES

In this paper, the DBEM/Hybrid LES（Directly Boundary Element Method/Hybrid Large Eddy Simulation）technique is applied to predict aerodynamic noise generated by tandem circular cylinders immersed in a three-dimensional turbulent flow. Utilizing Lighthill's Acoustic Analogy, flow pressure fluctuation near surface of cylinder converted into acoustic dipole sources. Taking sound sources as actual sources, aeroacoustic field simulated and analyzed DBEM. The research shows that: strong are distributed collision zone downstream cylindrical surface, where upstream cylinder's shedding vortex colliding surface. Both amplitude-frequency response phase-frequency source obtained, which helpful for further on aerodynamics interference suppression. Good comparisons obtained between numerical results BART (Basic Aerodynamic Research Tunnel) experimental data published NASA.