On the Relationship between Viscous Pressure Resistance due to Flow Separation and Turbulent Boundary Layer of an Elliptic Cylinder

概要

論文の詳細を見る
This paper deals with the experimental analyses on the relationship between viscous pressure resistance due to flow separation and turbulent boundary layer development over a two-dimensional elliptic cylinder from the viewpoint of the scale effect. The experiments were carried out i) by attaching a roughness on the hull surface to control the boundary layer development and ii) by installing a pair of rotating cylinders inside the hull surface to control the separation point. It was clarified through the experiments using a surface roughness that the contribution of the location of separation point and the displacement thickness near it to the scale effect of the viscous pressure resistance due to flow separation is significant. Of those parameters, the effect of the former is predominant for ship-like form with blunt stern. The increase of the rotational speed of a pair of rotating cylinders made the separation point move downstream and the shape factor of the boundary layer be constant near the stern.
社団法人日本船舶海洋工学会の論文