Direct Numerical Simulation of the Motion response AT rotary in regular waves

Abstract

Numerical simulation of the 6DOF(six-degree-of-freedom) response motion of ship in wave is one of the most challenging maneuvering tasks. Based on the DTMB5415 model, this paper uses an in-house code to simulation the rotational motion in calm water and regular wave. The simulation process uses a viscous CFD code that combines 6DOF solid motion equations and overset grids. The RANS equation is solved by finite difference method and the projection algorithm, simulation of propeller motion using a body-force model, and the level set method is used to simulate the free surface. Taking into account the validation of the reliability of the in-house code, this paper simulates the rotation of the modified DTMB5415 model in calm water, the motion of the ship is well matched with experiment. This article mainly studied the characteristics of the trajectories of turning circle, roll, speed lose, etc, and are helpful to judge the influence of the wave about the rotational motion. The results indicate that the rotation trajectory in the regular wave is obviously deviate from the rotation trajectory in the calm water. The speed loss in the regular wave is more than in the calm water, and the velocity of turning maneuver in the regular wave will always fluctuate.