Impact of Geometry Changes on Noise Radiated by a Square Cylinder in Cross Flow

The objective of the present paper is to investigate the influence of changes in geometry of a wall mounted square cylinder in cross flow onto the generated aerodynamic noise. The flow field and acoustic field of several geometries are obtained and their interaction is analyzed. The results of the subset of geometries investigated indicate that the reduction of turbulent kinetic energy not necessarily leads to a reduction of radiated noise as well. Reducing the fluctuations of the stagnation point in front of the cylinder, maintaining a fixed separation line and reducing the symmetry of the vortex street seem to be effective measures for reducing aerodynamic noise among other known approaches.