二次元うず列後流の分散構造に関する研究

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The dispersion of velocity fluctuations, and its effect on phase-averaged properties of a two-dimensional vortex wake behind a normal plate, were studied both experimentally and by a numerical analysis. Reynolds number, based on the main-flow velocity and the height h of the plate, was 2.3 ×10^4. Measurements were made at 8h downstream of the plate. The dispersion was defined as a deviation from phase-averaged velocities, and was interpreted as being caused by random fluctuations of length scale, strength, position, shape, etc. of the shed vortices passing a section normal to the main-flow direction χ. The dispersion was found to contribute to most of the Reynolds shear stress and energy of the velocity flucations. General features of loci of constant energy and cross product of velocity fluctuations in the (χ,t) space-time domain, t being time, were almost independent of a condition of the phase-averaging, which was given in terms of the standard deviation of the vortex-shedding period. Moreover, the overall Reynolds shear stress and the energy were only weakly dependent on the condition. A numerical analysis simulating the dispersion by a two-dimensional fluctuation of position and strength of the vortex around the phase-averaged values, suggested that such fluctuations were not major agent of the dispersion, and the dispersion was probably associated with a two-and/or three-dimensional deformation of the vortices.
一般社団法人日本機械学会の論文
1986-01-25

二次元うず列後流の分散構造に関する研究

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