RELATIVE SCALING EXPONENTS OF N-TH-ORDER VELOCITY AND TEMPERATURE STRUCTURE FUNCTIONS

Scaling exponents of the moments of the instantaneous velocity vector fluctuation increment, delta q, and its components (delta u, delta v a nd delta w) are compared with those of the temperature fluctuation inc rement, delta theta, in the self-preserving region of a cylinder wake. Across the wake, delta q scaling exponents compare more favorably to those of delta theta than do delta u with delta theta mainly because d elta q is interdependent on delta v and delta w. The agreement between scaling exponents of delta v or delta w with those of delta theta do not seem to depend on either the local mean shear or R-lambda, althoug h the individual magnitudes of these exponents increase with R-lambda and decrease with the local mean shear.