Abstract
Measurements of the isotropic transport equation for the mean energy dissipation rate in decaying grid turbulence indicate that the destruction term increases linearly with the Taylor microscale Reynolds number R λ whereas the skewness of the longitudinal velocity derivative is approximately independent of R λ. As a consequence, self-preservation based on the Taylor microscale λ is strictly valid when R λ is constant during decay. The high wavenumber part of the vorticity spectrum scales approximately on the Kolmogorov microscale, thus excluding the possibility of a λ-based similarity for all scales of motion except when R λ is constant.
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