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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44892

    Title: Vortex Shedding from Fixed and Oscillating Rectangular Prisms in Shear Flows
    Other Titles: 剪力流中矩柱之渦散現象研究
    Authors: Lu, Po-chien;Cheng, Chi-ming;Liang, Horng-sheng
    Contributors: 淡江大學水資源及環境工程學系;淡江大學土木工程學系
    Keywords: Vortex shedding;Shear flow;Wake cell boundary;渦散;剪力流;格元分界
    Date: 1997-09
    Issue Date: 2013-07-11 12:00:42 (UTC+8)
    Publisher: Taipei : Chinese Institute of Chemical Engineers
    Abstract: The main focus of this paper is to study the results of experiments on six different rectangular prisms with varied side ratios, with and without forced oscillation, displaced in two shear free streams and one uniform flow. The setting of free stream shear parameters f3=dU!dyxD/Uc are .24 and .32. With respect to vortex shedding phenomena, a comparison between shear flows and uniform flows is also part of the focus. Experimental results indicate that disturbance on the twodimensional vortex shedding of the uniform flow is caused by the longitudinal vortex of the shear flow gradient. As a result, a spanwise distribution of cells among the vortex shedding frequencies is created. Increases in the side ratios of the rectangular prisms can cause a shifting of cell boundaries toward the high-speed end. As shear parameters for the same prism increase, the cell boundaries move toward the lowspeed end. During oscillation, differences arise between the vorticity structures of cells, and the vortices of each cell are more unified, with improvements in correlation.
    Relation: Journal of the Chinese Institute of Engineers=中國工程學刊 20(5), pp.501-509
    DOI: 10.1080/02533839.1997.9741857
    Appears in Collections:[Graduate Institute & Department of Educational Technology ] Proceeding
    [Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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