Fundamental Investigation on Estimation of Hydrodynamic Forces Acting on a Ship in Oblique Motion by Using Three Dimensional Vortex Method

Abstract

In this paper, we focus on a three-dimensional vortex method as a useful calculation method to estimate the maneuverability of ships. The three-dimensional vortex method which does not need the grid generation as a pre-process is a Lagrangian method. The govering equations of the three-dimensional voretex method are vorticity transport equations and continuity equations.At first, we investigate effects of arbitrary parameters in the three-dimensional vortex method. we apply the three-dimensional vortex method to estimate the force acting on cylinder and sphere in various Reynolds number.Thereafter we calculate flow fields around a VLCC in oblique motion (β = 3°, 6°, 12°) and invesitgate usefulness of the three-dimensional vortex method.