帆走の船舶流体力学的研究(第3報) : 船体に作用する流体力

概要

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For improving the performance of a sailing yacht, it is desired very eagerly to investigate the hydrodynamic forces and moments acting on a yacht hull. This paper deals with the lateral force and the yawing moment of fin-keel yacht hulls in oblique sailing and shows a procedure to estimate them by theoretical calculation. The outline of the procedure is as follows: l) The lateral force of the bare hull is calculated by means of the slender-body theory. 2) Assuming that the hull be an infinite length cylinder, the lateral force of the fin-keel including the hull-to-fin interference is calculated by mens of the vortex wing theory. The fin-to-hull interference force is also obtained by the same assumption. 3) The lateral force of the rudder and it's interference to the hull are calculated by means of the wing theory, taking account of the down-wash by vortex sheets shed from the trailing edge of the fin-keel as well as the frictional wake caused by the hull and the fin-keel. 4) The total lateral force of the whole under-water body is obtained by summing up all these forces. The center of lateral resistance, CLR, is also obtained similarly. The procadure works well to interprete model test results. It will be usefull to predict the full scale performance of a yacht hull together with a scale-effect correction.
社団法人日本船舶海洋工学会の論文
1982-06-30