静止流体中の回転円筒まわりの乱流せん断流 : 第2報, 大渦の構造

概要

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Measurements have been made for space-time correlations of velocity fluctuations in the turbulent shear flow around a circular cylinder spinning in a quiescent fluid. Optimum delay time and the associated motion of lumps of eddies are considered. In order to examine the spatial structure of the turbulent field, Taylor's hypothesis is used to transform the time coordinate to the peripheral one, and various contour maps of spatial iso-correlations are obtained in plane perpendicular to the cylinder axis. The change in the iso-correlation contours for Q_<2,2> in the plane of y_s = 0 with the cut-off frequency of a high-pass filter suggests that the mean shear has only a little effect on large eddies with low frequency. The contours for Q_<2,3> show that the range over which the correlation holds the finite value extends in the axial direction over nearly twice the radius of the cylinder, and that there exists a comlex large-eddy structure.
一般社団法人日本機械学会の論文
1988-02-25