没水体後流のカルマン渦列発生機構に関する研究

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One of the present authors has found, by model tests, a wake strikingly similar to a Karman vortex street behind a submerged topography. This paper then discribes the results of flow visualization which was made for a better understanding of the wake resembling a Karman vortex street behind three-dimensional surface obstacles such as cones and circular cylinders under various submergence. It is found that a Karman vortex street is formed when the submergence of obstacles is small enough to diffuse the wake up to the free-surface. After the wake distributes fully in depthwise, the wake seems to behave like a two-dimensional one. The atmospheric island wakes observed in satellite pictures are other examples of the two-dimensional flow around three-dimensional topography. This phenomenon is basically understood that tow-dimensional flows can be apply to three-dimensional obstacles when the stable stratification in the air exists. In the case of free-surface flows, the present authors confirm numerically and experimentally that two-dimesional flows appear to approximate the flow structure when the submergnece of the obstacle is small even if no stratification of the fluid exsts. The images of a surface obstacle due to the free-surface can be considered as the cause to force streamlines from upstream to go round the obstacle and to produce a two-dimensional wake, i.e. a Karman vortex street, behind it.
社団法人日本船舶海洋工学会の論文
1991-03-29

没水体後流のカルマン渦列発生機構に関する研究

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