Measurement of two-point correlations of velocity near a circular cylinder shedding a karman vortex street

Results of an experimental investigation of two-point correlations of velocity near a circular cylinder shedding a Karman vortex street are presented. The measurements were made along a line parallel to the generator of the cylinder which is at 900 from the upstream direction. The cylinder was mounted transversely in an airstream, and two hot-wire probes were used as anemometers . The curves of correlation coefficient versus probe separation approach zero as the separation between the probes is increased to large values. A plot of correlation length versus Reynolds number, based in part on a conservative extrapolation, is also presented and compared with correlation length data from pressure measurements taken from reference 3.