Investigation on the influence induced by interceptor on the viscous flow field of deep-Vee vessel

Abstract

Interceptor is widely adopted by planing boat but adopted by deep-Vee vessel rarely. This study focuses on the general rules of the influence caused by interceptor on the viscous flow field around deep-Vee vessel. A series of simplified deep-Vee vessels of different deadrise angles are designed, and the lift force of them are calculated in the condition that six-degree of freedom is constrained. A set of numerical simulation scheme was established through the comparison of the numerical results and experimental data in the conditions of different mesh sizes. Then, the viscous flow field around the deep-Vee vessel in the conditions of different interceptor height, deadrise angles and velocities are simulated by CFD approach, the results of drag, lift force, wave profiles and pressure distribution on the bottom and velocity distribution at the stern are analyzed. According to the results, the virtual length, height of rooster tail flow, pressure distribution on the bottom, lift force coefficient were proportional to velocity and interceptor height, but decreased when the deadrise angle is increased in the condition of the same velocity and interceptor height. The resistance cannot be reduced by interceptor if the motion of the deep-Vee vessel was constrained. A continuous distributed vortex was induced, and another vortex of small scale was found located ahead of it in some special conditions.