TURBULENCE STRUCTURE IN INTERMEDIATE WAKE OF A CIRCULAR CYLINDER
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概要
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Turbulence structure in the intermediate wake of a circular cylinder was studied by a conditional-sampling technique. The measurements were made at a section 8 diameters downstream of the centre of the cylinder. Lateral velocity fluctuations at each position of measurement were found to a proper reference signal to make the conditional sampling if they were combined with longitudinal velocity fluctuations along the wake axis. Velocity fluctuations were decomposed into those produced by large-scale coherent structures and those associated with small-scale structures. Maps of streamlines, vorticity, velocity vectors and correlation of velocity fluctuations were presented in the large-scale structures. Intensity, correlation and intermittency of the small-scale fluctuations were also presented and discussed in relation to the flow field in and around the large-scale structures. A mechanism of entrainment by the large-scale structures and diffusion of their vorticity was suggested on the basis of the above results.
- 一般社団法人日本機械学会の論文
著者
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Kiya Masaru
Faculty Of Engineering Hokkaido Univ.
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MATSUMURA Masanori
Faculty of Engineering, Hokkaido Univ.
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Kiya Masaru
Faculty Of Engineering Hokkaido Technology
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Matsumura Masanori
Faculty Of Engineering Hokkaido Univ.
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