Analysis of Velocity and Pressure Fields for an Axisymmetric Body in Water at Different Motion Attitudes

Considering that the marine environment is complex and in order to overcome the difference between the buoyancy and the gravity of the underwater vehicle, there will be a certain attack angle between the axisymmetric body and its heading. It results in a certain angle between the direction of incoming stream and the axis of the axisymmetric body. This paper focuses on analyzing the velocity and pressure fields of axisymmetric body at different motion attitudes. It can be found that the pressure coefficient and velocity are distributed identically in the circumferential direction when the axisymmetric body is in attitude B. The pressure coefficient is smaller and the velocity is larger at the lower part of the head curved surface (S2) of the axisymmetric body when the axisymmetric body is in attitude A. When the axisymmetric body is in attitude C, the pressure coefficient is smaller and the velocity is larger at the upper part of the head curved surface (S3) of the body. Corresponding, the value of the sound pressure level of the flow noise and the radiation direction of the flow noise are different.