The method to suppress the hydrodynamic noise from a sail hull model by the dimples

The hydrodynamic noise can become the main noise source of underwater vehicles at high speeds. In this paper, we have placed the dimples on the transition area of a sail hull model, based on the drag reduction mechanism of the dimples in the golf balls. We have found that the dimples can change the flow and suppress the hydrodynamic noise. The flow field has been calculated by the large eddy simulation. Then, the turbulent fluctuation pressure has been extracted. The hydrodynamic noise has been calculated by the Lighthill ' s acoustic analogy and the combination of finite element and infinite element method. We have investigated the effect of different aspect-ratio and diameter on the suppression of the hydrodynamic noise by the dimples in the sail hull model. The results show that the dimples can inhibit the boundary layer separation and suppress the hydrodynamic noise of the sail hull model. With the optimized dimples ' diameter and aspect-ratio, the effect of the hydrodynamic noise suppression can be reached more than 5dB. The results of this paper can lay the foundation for the control of the hydrodynamic noise from underwater vehicles, such as the UUV, AUV.