油流出事故対策に関する基礎的研究-IV : 流出油拡散防止膜展張時の流況シミュレーションについて

概要

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A discrete vortex method is applied to the two dimensional flow field enclosed with a hull and curtains for preventing spilt oil diffusion. The effects of the applied conditions such as a time interval, a treatment for viscous vortices and the number of separation points are investigated. The strength of a vortex to be shed into a shear layer, Γs, oscillates with time. In order to decrease the amplitude of the oscillations and make the flow steady, the following conditions must be considered. (1) The shorter the time interval of a vortex shedding is, the less the amplitude of the oscillations decreases. (2) When proper separation points are selected by try and error, the flow pattern becomes steady. (3) When some vortices are replaced by an equivalent single vortex and a vortex which approaches too close to the body face is eliminated, the flow pattern becomes steady.
社団法人日本航海学会の論文
1995-09-25