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International Journal of Theoretical Physics
Article . 2007 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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Article . 2007
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On the Origin of Turbulence

On the origin of turbulence
Authors: Casuso, E.;

On the Origin of Turbulence

Abstract

The paper is a description of the turbulence in fluids as a consequence of the inherent discontinuity of matter. The first part gives an introduction to the turbulence in fluids. Starting from the classical \textit{S. Chandrasekhar}'s theory [Proc. R. Soc. Lond., Ser. A 204, 435--449 (1951)], the author describes the turbulence motion as a hierarchy of eddies of different sizes. The author also explains the transfer of turbulent energy from the largest eddies to the smallest ones for which the viscosity plays an important role, dissipating the energy into thermal energy. In the second part the author obtains a model given by a deterministic differential equation which implies one of the main observational features of turbulence -- the transfer of energy between the eddies. Starting with the description of matter density as a discontinuous Dirichlet integral function \[ \rho(x,t)={1\over \pi} \sum_k \int{\sin(x_k t)\over t} e^{it(x+ k)}\,dt \] (\(k\) -- the central position of real matter structures, \(x_k\) -- the size of these structures) and by using the Euler equation for matter conservation, the author derives a differential equation which implies a transfer of velocity from a large eddy to a smaller one. The expression for the final turbulent velocity with external sinusoidal force applied to the system is given by \[ v_x= -\sum_k {\sin(x_k t)\over it^2} e^{it(x+ k)}+ h_1\sin(t(x- k))+\text{const}, \] if \(-x_k\leq x +k\leq x_k\), with \(h_1\) being some normalization constant. Some conclusions are presented in the last part of the paper.

Keywords

Fundamentals of turbulence, energy transfer, Turbulent transport, mixing, hierarchy of eddies, discontinuous Dirichlet integral function

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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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