Control of aerodynamic sound from a circular cylinder using a splitter plate

The aerodynamic sound from bluff bodies is a practically important problem in various engineering applications. To control the aerodynamic noise, the sound emitted from a circular cylinder with and without a splitter plate in a Reynolds number (Re) of 3 × 104 is studied using Ffowcs Williams and Hawkings (FW-H) acoustic analogy. The flow field is simulated by Detached Eddy Simulation (DES) approach to investigate the mechanism of the sound reduction using a splitter plate in a three-dimensional calculation. The predicted sound of the circular cylinder is compared with the experimental data from the literature, and a good agreement is achieved. The results from this study show that lift and drag fluctuations of the circular cylinder with the splitter plate are smaller than those of the no-splitter case. The Strouhal number related to vortex shedding with the splitter plate is slightly reduced compared to the unmodified circular cylinder due to the stretched shear layers. The pressure fluctuations in the wake are decreased by the splitter plate, resulting from the suppression of vortex shedding. The application of the splitter plate reduces the lift dipole which is the main sound source. It leads to a sound reduction of 13 dB.