Two-loop calculation of the turbulent Prandtl number

Details Two-loop calculation of the turbulent Prandtl number Two-loop calculation of the turbulent Prandtl number

2004-12-03

arxiv.org/abs/physics/0412019v1

Phys. Rev. E 71, 056311 (2005)

Physics

Fluid Dynamics

11 pages, 3 figures

Scientific paper

10.1103/PhysRevE.71.056311

The turbulent Prandtl number has been calculated in the two-loop approximation of the $\eps$ expansion of the stochastic theory of turbulence. The strikingly small value obtained for the two-loop correction explains the good agreement of the earlier one-loop result with the experiment. This situation is drastically different from other available nontrivial two-loop results, which exhibit corrections of the magnitude of the one-loop term. The reason is traced to the mutual cancellation of additional divergences appearing in two dimensions which have had a major effect on the results of previous calculations of other quantities.

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