線形剪断勾配に伴う流れの構造の変化

概要

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Abstract Uniformly sheared flows with different shear rates are achieved conveniently by using wind tunnels of multi-fan type, which have different configuration of fans, and different width-to-height ratios W/Hof the test section, where W is the width, H is the height of the test section. The purpose of the present study is to investigate the spatial turbulence structure of the uniformly sheared flow. The flow structure around the middle layer remains unchanged after a certain non-dimensional time elapsed. A significant increase ("bump") in the longitudinal fluctuation r.m.s. is found for the largest shear rate in the wind tunnel of W/H= 5.6, and this bump should be closely related to the emergence of three-dimensionality of the flow structure. Time traces show a distinctive feature in a layer on the lower velocity side close to the wall, and its probability distribution function indicates that bursting motion causes the behavior.
宮崎大学の論文