Numerical Simulation of Two-Dimensional Bluff Body Aerodynamic Noise Using Lattice Boltzmann Method

Aerodynamic noise generated by air-moving devices is a common problem. In this paper, the aerodynamic noise around two-dimensional bluff body flow was simulated by Lattice Boltzmann Method. Utilizing blend radius can reduce the aerodynamic noise around the bluff body notably, and the greater the blend radius, the better the noise reduction effect will be. When the basic shape model is simulated and post-processed, the speed nephogram and the streamline chart of the flow field were obtained. Then Sound Pressure Level (SPL) of some key points was tested. Changing the shape of the bluff body's vertices to blend radius, the results were compared with those of the basic shape, and the aerodynamic noise was reduced.