A quadratic Reynolds stress development for the turbulent Kolmogorov flow
Abstract
We study the three-dimensional turbulent Kolmogorov flow, i.e. the Navier-Stokes equations forced by a low-single-wave-number sinusoidal force in a periodic domain, by means of direct numerical simulations. This classical model system is a realization of anisotropic and non-homogeneous hydrodynamic turbulence. Boussinesq's eddy viscosity linear relation is checked and found to be approximately valid over half of the system volume. A more general nonlinear quadratic Reynolds stress development is proposed and its parameters estimated at varying the Taylor scale-based Reynolds number in the flow up to the value 200. The case of a forcing with a different shape, here chosen Gaussian, is considered and the differences with the sinusoidal forcing are emphasized.
Keywords
Cite
@article{arxiv.2101.05176,
title = {A quadratic Reynolds stress development for the turbulent Kolmogorov flow},
author = {Wenwei Wu and Francois G. Schmitt and Enrico Calzavarini and Lipo Wang},
journal= {arXiv preprint arXiv:2101.05176},
year = {2021}
}
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11 pages