Study on flow noise characteristics of Bionic cylinder based on acoustic analogy

The drag and noise reduction of the flow around a cylinder is one important topics in hydrodynamics acoustics. In this paper, three typical bionic cylinders are designed based on serrated structure surface shark skin. Using Large eddy turbulence model Lighthill’s acoustic analogy method, characteristics smooth kinds at different Reynolds numbers were compared, was optimized. results show that main source dipole noise, which caused by periodic fluctuating pressure surface.The can reduce amplitude pressure, improve wake field vorticity, so as to noise. Among cylinder, V-shaped has best effect, critical value S/H about 2.5. When s / h > 2.5, no effect reduction.