A Study on Separated Flows behind Bluff Bodies by Inviscid Vortex Models (1st Report) : for Two-Dimensional Flat Plate and Circular Cylinder
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概要
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Two-dimensional transient and quasi-steady separated flows behind a flat plate and a circular cylinder are simulated by inviscid vortex models using a discretevortex approximation for free shear layers. The features of the models are discussed through the comparisons of the numerical results with experimental data. Light is thrown on the time development of wake in transient flow and on a new method for the calculation of vortex shedding from a circular cylinder. The method is developed through the consideration of the treatment of Kutta condition which determines the circumstances of vortex shedding from body surface, on the assumption of the location of the separation point from which free vortices are shed. The time development of wake not only of a flat plate, but of a circular cylinder in transient flow for short times after their starts can be explained with inviscid vortex models. The method proposed here is shown to predict, for circular cylinder, the vortex patterns, the drag, the side force and the Strouhal number to a good degree of agreement with the experimental results.
- 社団法人日本船舶海洋工学会の論文