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Title of Journal: Sci China Technol Sci

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Abbravation: Science China Technological Sciences

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Science China Press

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DOI

10.1002/chin.199733134

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1869-1900

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Reynolds number dependence of flow past a shallow

Authors: Huai Chen Qiang Zhong XingKui Wang DanXun Li
Publish Date: 2014/09/02
Volume: 57, Issue: 11, Pages: 2161-2171
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Abstract

Measurements were carried out in a shallow open cavity with particle image velocimetry technique The cavity has a length todepth ratio of 41 and the upstream inflow conditions include laminar transient and turbulent regimes at seven different Reynolds numbers The measured instantaneous velocities were analyzed through ensemble average vortex extraction and proper orthogonal decomposition POD to investigate overall flow circulations Reynolds stress distribution spanwise vortex population and the characteristics of the POD modes The results reveal distinctive Reynolds number dependence of the cavity flow eg an increase in Reynolds number results in constant migration of the overall circulation enhancement of Reynolds stress reduction of correlation between vortex and Reynolds stress and decrease of fractional energy of the characteristic POD modes Finally a phenomenological model was proposed to describe various features of cavity flow

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