<紀要論文>
鞍部のある山岳モデルをすぎる安定成層流の可視化実験

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概要 A visual study has been made of the stably stratified flows over a ridge model or a ridge with a col. The ridge model is triangular in cross-section, and the ridge with a col has the same shape as the... ridge model but has a col at the centre of the span. The depth of the col is 1/2H, where H is the height of models. The experiments were performed by towing models through linearly stratified saline-water solutions. The Froude number Fr (=U_0/NH) was changed from 0.05 to 1.67 ( and ∞), where U_0 is the towing speed, N the Brunt-Vaisala frequency. The streak line patterns and the streamline patterns around models were visualized by the electrolytic precipitation method and the neutrally buoyant tracer particles method, respectively. The velocity fields at several vertical cross sections were obtained by the PIV method. Furthermore, the heights of the dividing-streamline at the windward side of the models were measured. If a ridge has a col, the flow has converged to the col and a strong flow has been generated leeward along the slope of the col at low values of Fr. When Fr > 0.5, however, the flow converging to the col could not been observed. In the experiments, the height of the bottom of the col is 0.5H. When Fr < 0.5, the value of the dividing-streamline height Hs is larger than 0.5H. It will be concluded that when the dividing-streamline height is higher than the height of the bottom of the col, the blocked fluids converge to the col.続きを見る

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登録日 2013.08.02
更新日 2017.01.24