BibTeX
@MISC{Oparin_aformation,
author = {Alexei M. Oparin},
title = {A FORMATION OF TURBULENCE SPECTRUM IN FREE SHEAR FLOW},
year = {}
}
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Abstract
Abstract. We propose new physical model of the development of turbulence in free shear flows which contains main idea about leading role of large scale structures. Our theory is based on the results of numerical simulations of turbulent flow development. In these calculations the main idea of the proposed theory of turbulence in free shear flow is stated as follow: the onset of turbulence begins with the formation of large vortices. Very important moment is the appearance of the secondary instability. This instability leads to the creation of turbulence cascade. In our calculation we obtain the spectrum which is different from Kolmogorov’s universal spectrum. The spectrum is sensitive to the problem dimensionality. We show our results of the evolution of large-scale turbulence in accretion disks for thin accretion disk. A possible mechanism explaining the transfer of angular momentum by large vortices that form in the disk without any noticeable heating of the matter is suggested. 1.
Keyphrases
large vortex main idea secondary instability numerical simulation noticeable heating large scale structure free shear free shear flow new physical model accretion disk problem dimensionality turbulence begin turbulent flow development large-scale turbulence possible mechanism thin accretion disk kolmogorov universal spectrum turbulence cascade angular momentum important moment
