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

Nowadays, the linear optimization is mainly used to control the flow from the appendage joints to inhibit the hydrodynamic noise. In this paper, we have proposed a new method to suppress the hydrodynamic noise from a sail hull model by the suction technique. Some holes are placed on the leading-edge of the sail hull, then, the fluid is introduced into the tail or the transition zone by the pressure difference. The hydrodynamic noise has been suppressed by this technique, since the surface flow over the sail hull has been controlled. We have used the large eddy simulation to calculate the flow field. The hydrodynamic noise has been calculated by the Lighthill ' s acoustic analogy and the combination of the finite element and infinite element method. We have investigated the effect of the suctions' position, diameter and period on the hydrodynamic noise suppression. The results show that the suction can reduce the turbulent fluctuation pressure on the leading-edge of the sail hull. The hydrodynamic noise effect can be achieved more than 5dB in the frequency range from 10Hz to 2000Hz. The method in our study can provide some references for the hydrodynamic noise suppression of underwater vehicles.