横揺れ時の船体近傍の流場について

概要

論文の詳細を見る
The unsteady flow velocity near the hull of two dimensional cylinders in roll motion is measured using a hot wire anemometer. The measured values are found to be in good agreement with the theoretical ones which are expressed as a composite form of the solutions of the inner viscous flow and the outer potential flow. And the comparison between the theoretical skin friction and the experimental one deduced from the measured velocity gradient also shows an agreement in case of the cylinder of a midship section. Applying the theory to the ordinary three dimensional ship form, the frictional damping is evaluated, the value of which is almost the same to that of Kato's formula. In addition, from the measurements of the velocity profile for cylinders with small bilge radius, it is found that the size of the separation bubble is unexpectedly small but that the velocity just outside of the bubble is considerably large. The eddy making component of the roll damping obtained from the measured velocity is in approximete agreement with the experimental ones.
社団法人日本船舶海洋工学会の論文
1978-12-30