Calculation of Viscous Flow Field around Ship Hull with Special Reference to Stern Wake Distribution

Abstract

The authors have recently proposed a new method of calculation for predicting the development of the three-dimensional turbulent boundary layer over a ship hull and made use of a slightly modified form of the Hess-Smith's method to obtain the potential flow velocities on the hull. As an application of these procedures, the authors attempt to calculate wake distributions near the stern of the ship. The wake vector can be obtained as the uniformly valid solution which is composed of the outer potential flow and the inner boundary layer flow, both of them being the first approximations to the exact solutions. The wake vector predicted is compared with the measured values in ship models including the Series 60 parent forms. The agreement seems to be fairly good as to the longitudinal wake contours and the wake vector components projected to the sectional plane, except for the case of full ship forms in which the effects of bilge vortices cannot be neglected.