水中物体の背後に形成される後流域より発生する質量力

概要

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Large-scale wake is generated behind a bluff body being widely used elements of submerged structure. Until now, added mass component of unsteady force acting on the body was generally calcu-lated by potential theory. However, the real flow that has the wake behind a body is different from the potential flow. Unsteady force is calculated more accurately by using a new dimensionless number, we de-signate as “wake mass coefficient” which can be calculated by the change of the wake momentum. Judging from the experimental result of a normal plate, wake mass coefficient comes to the values of 0.17 by way of a universal constant independent of Reynolds number and accerelation of principal flow. It suggests that the generation of added mass is largely related to the growth of the wake behind a body.
日本水産學會の論文