| INFLUENCE OF COHERENT STRUCTURE ON SCALAR DIFFUSION IN TURBULENT BOUNDARY LAYERS |
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| 作者姓名： | Fan Jing-yu |
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| 作者单位： | Fan Jing yu，Wang Dao zeng Shanghai Institute of Applied Mathematics and Mechanics，Shanghai University，Shanghai 200072，P.R.China |
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| 摘 要： | 1. ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｕｒｂｕｌｅｎｔｃｏｈｅｒｅｎｔｓｔｒｕｃｔｕｒｅｗａｓｆｏｕｎｄａｎｄｒｅｓｅａｒｃｈｅｄｉｎｔｈｅｒｅｃｅｎｔｔｈｒｅｅｄｅｃａｄｅｓａｎｄｐｒｏｖｉｄｅｄａｓｔｒｏｎｇｉｍｐｅｔｕｓｆｏｒｆｕｒｔｈｅｒｓｔｕ...
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| 关 键 词： | scalar diffusion coherent structure turbulent boundary layer |
INFLUENCE OF COHERENT STRUCTURE ON SCALAR DIFFUSION IN TURBULENT BOUNDARY LAYERS |
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| Fan Jing-yu.INFLUENCE OF COHERENT STRUCTURE ON SCALAR DIFFUSION IN TURBULENT BOUNDARY LAYERS[J].Journal of Hydrodynamics,1999,11(4):98-102. |
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| Authors: | Fan Jing-yu Wang Dao-zeng |
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| Abstract: | Simulation experiments of scalar diffusion have been performed using flow visualisation, quantitative measurement and frequency spectra analysis techniques in an atmospheric boundary layer wind tunnel and in an open tidal water flow channel. The results of experimental research and theoretical analysis indicate that the turbulent intermittent phenomenon plays an important role in scalar diffusion in shear flows. In the near fleld, the scalar diffusion is mainly affected by the nonisotropic quasi periodic large scale coherent structure of turbulence. The rough values of time and space scales of turbulent coherent structure have been obtained by combining flow visualisation with turbulent frequency spectra analysis. |
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| Keywords: | scalar diffusion coherent structure turbulent boundary layer |
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