Abstract
In a recent Letter, Hosokawa and Yamamoto (1992) have provided evidence against Kolmogorov's refined similarity hypothesis based on the results of direct numerical simulations of isotropic turbulence with Re sub lambda close to 100. Experimental results are presented from a wind-tunnel study of a cylinder wake, at Re sub lambda of 550, which in spirit confirm the hypothesis, especially for the smaller scales in the inertial range. The present experimental velocity spectra contain one and one-half decades of inertial range. The apparent basic disagreement between the numerical simulations and the experiments may be due to the difference in Re sub lambda, or may be symptomatic of a more subtle problem. (Author)