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Pressure–velocity correlations and scaling exponents in turbulence

Published online by Cambridge University Press:  11 November 2003

VICTOR YAKHOT
Affiliation:
Department of Aerospace and Mechanical Engineering, Boston University, Boston, MA 02215, USA

Abstract

It is shown that each structure function $S_{n,m}(r)$, of order $n+m$, in strong turbulence is characterized by its own dissipation scale $\eta_{n,m}$. In the limit $n\rightarrow\infty$, the dissipation scale $\eta_{n,0}= O(\hbox{\it Re}^{-1})$, which is much smaller than the Kolmogorov scale $\eta=O(\hbox{\it Re}^{-{3}/{4}})$, $\hbox{\it Re}$ being the large-scale Reynolds number. This result has implications for the resolution requirements of direct simulations of turbulence. A new rigorous dynamic constraint relating scaling exponents of the structure functions to the codimension of the most singular features of turbulence is derived. A modification of the model by Gotoh & Nakano (2003) for the pressure–velocity correlations, based on the Bernoulli equation, is proposed. This proposal leads to an analytic expression for the scaling exponents of velocity structure functions.

Type
Papers
Copyright
© 2003 Cambridge University Press

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