Flow Mechanism and Hydrodymanic Characteristics of 3D Cavity on the Surface of the Underwater Vehicle

The flow past 3D cavity is a common structure, which is located on the surface of the underwater vehicle. The flow mechanism and hydrodynamic characteristics of the cavity have great significance for the design of the underwater vehicle. In this paper, large eddy simulation (LES) is presented to investigate the flow mechanism and hydrodynamic characteristics of the 3D cavity in terms of flow mechanisms, drag and fluctuating pressure. It is found that the motion law of the large vortex inside the cavity, and the drag and fluctuating pressure of the trailing edge is the largest. By the water tunnel experiment, the calculation result agrees with the experiment well, and LES method is verified feasibly.