Hydrodynamics of planing surfaces with negative deadrise angles

Abstract

Existing physical model test data indicate that negative-deadrise planing surfaces may be capable of producing greater lift and lift-to-drag ratios than positive-deadrise planing surfaces. However, there is a lack of systematic experiments in which deadrise is varied with all other parameters are fixed. In this study, computational fluid dynamics software STAR-CCM+ is applied to simulate fixed-attitude prismatic planing hulls with variable deadrise, including positive and negative angles. Mesh dependency study and comparison with experimental data have been performed. The main reported hydrodynamic characteristics include the lift and drag coefficients, wetted area, and center of pressure. The negative-deadrise hulls are found to possess higher lift capabilities, while the highest lift-drag ratio is achieved by the zero-deadrise hull. With elimination of side wetting on negative-deadrise hulls, their efficiencies can be significantly increased.