STUDY ON FLOW STRUCTURE IN CAVITY OF STRAIGHT OPEN CHANNEL SIDE WALL

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  • 直線開水路側壁に設置された長方形キャビティ内の流れ構造

Abstract

<p> The flow structure in the rectangular cavity on the side wall of the straight open channel was examined using the flow velocity measurement method and the flow visualization method. The velocity inside the cavity becomes relatively low, and large-scale circulating flows and small-scale circulating flows in opposite directions around the vertical direction are formed. A region with a large horizontal Reynolds stress (-uw) is formed at the boundary between the cavity and the open channel. Its maximum value is below the water surface, and its value is three times as large as that near the side wall of the straight open channel. A group of longitudinal vortex structures formed on the upstream side wall stably flows down to the boundary region between the open channel and the cavity. This longitudinal vortex structure group develops along with the flow, and its fluid motion plays an important role in the formation of a high Reynolds stress region at the boundary between the swirling flow in the cavity and the open channel.</p>

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