A New Approach to Turbulent Transport of a Mean Scalar

Details A New Approach to Turbulent Transport of a Mean Scalar A New Approach to Turbulent Transport of a Mean Scalar

2003-02-02

arxiv.org/abs/astro-ph/0302013v3

Phys.Fluids 15 (2003) L73

Astronomy and Astrophysics

Astrophysics

8 Pages, LaTeX, version in press, Physics of Fluids (Letters)

Scientific paper

10.1063/1.1613281

We develop a simple mean field approach to the transport of a passive scalar for which the fundamental equation is a second order differential equation in the transported quantity, not a first order equation. Triple correlations are included, as they must be for any realistic description of turbulence. No correlation time enters the theory, only an eddy turnover time. The approach is simpler than standard approaches which incorporate triple correlations, but more realistic than Gaussian or short correlation time closures which do not. A similar approach has proven useful in magnetohydrodynamics.

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