波浪中における船の粘性伴流と粘性抵抗について

概要

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The three-dimensional unsteady boundary layer theory is applied to the problem of ship viscous wake-decrease and resistance-increase in waves. The laminar boundary layer equation is expanded with the assumption of small oscillation amplitude and high frequency, so that the steady part of the second-order solutions thus implies the effect of the oscillatory flow. The wake decreases due to the ship pitching motion and the incident wave are calculated showing a qualitatively good agreement with Nakamura and Naito's experiments. The calculation also gives an estimation of the viscous resistance increase in waves, which is, however, quite small compared to the wave resistance increase in waves. Although the present analysis is based on the laminar boundary layer, it represents the basic mechanism of the viscous effects of the ship hydrodynamic forces in waves.
社団法人日本船舶海洋工学会の論文