Statistical theory of isotropic turbulence Part IV: multiscales and cascade

Details Statistical theory of isotropic turbulence Part IV: multiscales and cascade Statistical theory of isotropic turbulence Part IV: multiscales and cascade

2010-12-23

arxiv.org/abs/1012.5151v1

Physics

Fluid Dynamics

24 pages, 1 figure

Scientific paper

This paper is the forth part of our series of work, is devoted to the analysis on the multiscales and cascade aspects of the statistical theory of isotropic turbulence based on the new Sedov-type solution. In this paper, we use the explicit map method to analyse the nonlinear dynamical behaviour for cascade in isotorpic turbulence. This deductive scale analysis is shown to provide the first visual evidence of the celebrated Richardson cascade, and reveals in partcular its multiscale character. The results also indicate that the energy cascading process has remarkable similarities with the determinisitic construction rules of the logistic map. Cascade of period-doubling bifurcations have been seen in this isotropic turbuent systems that exhibit chaotic behaviour. The 'cascade' appears as an infinite sequence of period-doubling bifurcations.

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