年次大会
Online ISSN : 2424-2667
ISSN-L : 2424-2667
セッションID: S053071
会議情報
S053071 乱流境界層の特性とバースト現象に及ぼす円柱後流による主流乱れの影響
晝田 紘佑長田 孝二酒井 康彦寺島 修伊藤 靖仁
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会議録・要旨集 フリー

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Effects of the cylinder wake in a freestream on statistical properties of a turbulent boundary layer over a flat plate are experimentally investigated in a wind tunnel. The cylinder is set horizontally over the flat plate. We investigated 3 types of interactions between the wake and the zero-pressure-gradient turbulent boundary layer. Instantaneous velocity is measured by using the hot wire anemometry. We used the variable interval time average (VITA) technique to detect the bursting event. The results show that the time-averaged mean velocity in the inner layer for the case with the cylinder wake coincides with that for the case without the cylinder wake. However, turbulence intensities and Reynolds stress normalized by the inner parameters are suppressed in the outer layer by the cylinder wake. It is found that the velocity fluctuation during the sweep phase in the bursting event is increased by the cylinder wake.
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© 2012 一般社団法人 日本機械学会
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