First Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP1
Rλ BEHAVIOUR OF 2ND & 4TH-ORDER MOMENTS OF VELOCITY INCREMENTS & DERIVATIVES
pages 91-96
DOI: 10.1615/TSFP1.160
SINOPSIS
The Rλ behaviour of low-order (n = 2 and 4) moments of velocity increments and derivatives has been examined in anisotropic shear flows over a significant Rλ range. The inertial range scaling exponents for transverse structure functions are observed to approach those of the longitudinal structure functions. Their relative behaviour suggest that any inequality may disappear at Rλ ~ 5000, depending on the degree of global anisotropy present. The 4th-order moments of the transverse velocity derivative have approximately the same Rλ power-law exponent as the equivalent longitudinal velocity derivative moments.