5. Calculation of Velocity Distribution in Ship Wake

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An attempt is made to estimate the velocity distributions in ship wake under the assumption that the velocity consists of the potential and viscous components. The former is calculated from the source distribution which is obtained by the wave analysis and from the hull surface condition. The latter is calculated as the induced velocity of the vorticity distributed in the boundary layer and in the wake; the three-dimensional boundary layer calculation are carried out in order to estimate the vorticity distributed in the boundary layer and the diffusion equation is solved to get that distributed in the wake. In part 1, the velocity distribution of a Wigley model is calculated; comparing with the measured results, good agreements are obtained. As an application of the present results, the viscous resistance is estimated. In part 2, before applying the present method to practical hull forms, experiments are carried out in order to study about the three-dimensional separation and to estimate the diffusivity coefficient; observations of the limiting streamlines, velocity measurements around the separation position and vorticity measurements in wake. According to the experimental results a proposal is made for the criterion for the onset of the separation, and the amount of the diffusivity coefficient is determined. After these experimental considerations, velocity calculation of a tanker model is carried out, which shows a fairly well agreements with the measured results.

5. Calculation of Velocity Distribution in Ship Wake

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