Numerical Simulation and Analysis of Flow Noise for Underwater High-Speed Vehicle

The flow noise of underwater vehicle as the main self-noise source, which disturbs the normal working of sonar is especially serious during natural cavitation. Computational fluid dynamics (CFD) is used to calculate flow noise of vehicle with different head shapes and velocities. The distribution and rule of flow noise are obtained for various velocities. It is found that the flow noise of vehicle increases steadily with increasing velocity through the comparison and analysis of numerical simulation results. Under the same conditions, the flow noise of flat-head vehicle is a little larger than round-head. For the sake of predicting the flow noise of high-speed vehicle, the flow noise across cavitation regions is researched preliminarily in this paper.