Abstract
Recently Thoroddsen and Van Atta (1992,
Phys. Fluids A4, 2592) showed that Kolmogorov's
refined similarity hypothesis (1962,
J. Fluid Mech. 13, 77; 82) is supported by experimental data from a wind-tunnel study of a cylinder wake, at Re
λ of 550. We show here that the probability density of the Kolmogorov similarity variable approaches a Gaussian distribution. The data also suggest that it may obey an even more demanding conditional similarity, which leads to important conclusions regarding the scaling exponents.