8. On the Flow Field and the Hydrodynamic Forces of an Obliquing Ship

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This paper presents a method to calculate the flow field and the hydrodynamic forces of an obliquing ship under the free surface effect. We treat the ship hull as a thick wing of small aspect ratio. Ship hull is represented by the source distribution on the hull surface and the vortex distribution on the center plane of the hull. The strength of these singularities are obtained from the boundary condition on the hull and the Kutta's condition. In order to obtain the wave flow, we use Kyushu University method. This is a kind of the Rankine source method and does not use the finite difference operator to satisfy the radiation condition. Since the flow field is calculated using these singularities, the wave pattern, the pressure distribution and the wavemaking lateral force and resistance acting on the hull are obtained. Using this method, we calculate the flow field around Wigley hull with drift angle. The wave pattern and the hydrodynamic forces are compared with the experimental results. The agreements are satisfactory.
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