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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN Imprimir: 1-56700-135-1

Rλ BEHAVIOUR OF 2ND & 4TH-ORDER MOMENTS OF VELOCITY INCREMENTS & DERIVATIVES

Resumo

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.
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