1986 年 52 巻 478 号 p. 2374-2381
This paper deals with some space correlations of velocity fluctuations at two points in the turbulent shear flow around a circular cylinder spinning in a quiescent fluid. One of the dynamical correlation equations and one of the continuity relations are considered, to investigate the <spatial>--- structure of this turbulent flow field. Measured correlation distributions total twelve, of which uAuB shows the strongest correlation; and its shape near the peak has large curvature indicating a small eddy. On the other hand, the wide separation range is covered until it tends to zero, which implies the existence of large-scale eddy-lumps. The <ringed>--- eddy structure is well inferred by mixing length theory based on the measured profiles of uAvB in the axial direction. Balances of the continuity equation and the dynamic correlation equations are estimated.