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Theoretical and Computational Fluid Dynamics

, Volume 25, Issue 6, pp 421–445

First Online: 30 October 2010Received: 07 November 2009Accepted: 08 October 2010

Abstract

The present work studies the isotropic and homogeneous turbulence for incompressible fluids through a specific Lyapunov analysis. The analysis consists in the calculation of the velocity fluctuation through the Lyapunov theory applied to the local deformation using the Navier-Stokes equations, and in the study of the mechanism of energy cascade through the finite scale Lyapunov analysis of the relative motion between two particles. The analysis provides an explanation for the mechanism of energy cascade, leads to the closure of the von Kármán-Howarth equation, and describes the statistics of the velocity difference. Several tests and numerical results are presented.

KeywordsLyapunov analysis Von Kármán-Howarth equation Velocity difference statistics Communicated by Spalart

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Autor: Nicola de Divitiis

Fuente: https://link.springer.com/







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