Abstract
By installing a side cavity section to a relatively narrow open-channel flow, water surface oscillation is generated within the side cavity and main channel. It has been found that there exist several modes of oscillation that depends on the aspect ratio and the Froude number by the authors; however, the three-dimensional flow structure has not been clarified so far due to the complexity of flow. In this study, by using a LES model capable to represent surface oscillation, three-dimensional unsteady flow structures and the mass transfer between the side cavity section and the main stream are examined. It was found that for a mode showing a strong correlation between surface and velocity variations, the mass exchange at the side cavity zone becomes significant. It was also made clear that as the decrease of the side cavity width, the three dimensionality of the flow becomes evident.
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