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On the spreading of a turbulent spot in the absence of a pressure gradient

On the spreading of a turbulent spot in the absence of a pressure gradient <jats:p>We derive a path-integral representation for the effective diffusion function of a passive scalar field. We use it to calculate the long-time effective diffusivity in Gaussian turbulence in the near-Markovian limit. Our results confirm the negative effect of vorticity predicted by previous discussions. They also demonstrate that the helicity of the turbulence when present may be as important an influence as the vorticity.</jats:p> http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fluid Mechanics CrossRef

On the spreading of a turbulent spot in the absence of a pressure gradient

Journal of Fluid Mechanics , Volume 123: 69-90 – Oct 1, 1982

On the spreading of a turbulent spot in the absence of a pressure gradient


Abstract

<jats:p>We derive a path-integral representation for the effective diffusion function of a passive scalar field. We use it to calculate the long-time effective diffusivity in Gaussian turbulence in the near-Markovian limit. Our results confirm the negative effect of vorticity predicted by previous discussions. They also demonstrate that the helicity of the turbulence when present may be as important an influence as the vorticity.</jats:p>

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Publisher
CrossRef
ISSN
0022-1120
DOI
10.1017/s0022112082002961
Publisher site
See Article on Publisher Site

Abstract

<jats:p>We derive a path-integral representation for the effective diffusion function of a passive scalar field. We use it to calculate the long-time effective diffusivity in Gaussian turbulence in the near-Markovian limit. Our results confirm the negative effect of vorticity predicted by previous discussions. They also demonstrate that the helicity of the turbulence when present may be as important an influence as the vorticity.</jats:p>

Journal

Journal of Fluid MechanicsCrossRef

Published: Oct 1, 1982

There are no references for this article.