ABSTRACT

The prediction of the total resistance and trim angle of planing crafts at high speed is very important. Since the hydrodynamic characters of high-speed crafts is significantly different from that of displacementtype vessels and need to be further investigated to obtain a better understanding. This issue was widely addressed experimentally so far. Compared with the experiments, the numerical investigation can avoid the tedious and large scale experiments and is able to provide more detailed results of continuous spatio-temporal distribution of physical quantities, such as the wave pattern and the pressure field near the craft. Nevertheless, the related numerical studies on high-speed crafts are relatively limited, mainly due to the complexity involved in this problem, such as wave breaking. This paper presents both experimental and numerical investigations on the hydrodynamic characters of a planing hull craft, including the drag coefficients and trim angle at different forward speeds. The comparison between the numerical and experimental results shows a fairly good agreement. Apart from this, the pressure field and wave pattern around the crafts will be numerically analyzed.

INTRODUCTION

With the development of marine transport, a greater number of highspeed craft are being designed and operated widely. One of them is the planing hull draft. Major concerns in designing the craft are their hydrodynamic properties There are two ways to understand the hydrodynamics of a planing craft. One way is through the experimental study and another is the through numerical simulation. The experimental studies or model tests for planing craft have been carried out for decades. For examples, Clement and Blount (1963) conducted an extensive model tests on a systematic series (Series 62); Savitsky (2002) developed regression formulas for estimating the hydrodynamic forces acting on planing craft.; and Savitsky et al. (2007) investigated the characteristics of the wetted bottom area and the spray area.

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