Abstract: A numerical simulation of flow and flow-induced noise was carried out on a duct cavity with Lighthill acoustical analogy and large eddy simulation method. The results agree well with the computed and experimental results in some published literature. The validation of the flow noise computation method used in this paper was verified. Then numerical simulations were carried out on two types of 3D submerged bodies, the prototype and the modified type. The inner flow patterns and the noise radiation results of both types were analyzed. The numerical results show that both the resistance and the flow noise level of the modified type are lower than those of the prototype.

Key words: submerged body, flow noise, large eddy simulation, Lighthill acoustical analogy