Stochastic dynamical model of intermittency in fully developed turbulence
نویسندگان
چکیده
منابع مشابه
Intermittency and scale-dependent statistics in fully developed turbulence.
Fully developed homogeneous isotropic turbulent fields, computed by direct numerical simulation, are compared to divergence-free random fields having the same energy spectrum and either the same helicity spectrum as that of the turbulent data, or vanishing helicity. We show that the scale-dependent velocity flatness quantifies the spatial variability of the energy spectrum. The flatness exhibit...
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Kolmogorov's phenomenological theory for the energy spectrum in a turbulent fluid in three dimensions is perhaps the single most successful theoretical attempt to comprehend fully developed turbulence. (1) Nevertheless it fails to account for certain fluctuation effects (" intermittency ") that are seen experimentally in three dimensions3 2) Furthermore, it is formulated in such general terms t...
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Intermittency, measured as log (F (r)/3), where F (r) is the flatness of velocity increments at scale r, is found to rapidly increase as viscous effects intensify, and eventually saturate at very small scales. This feature defines a finite intermediate range of scales between the inertial and dissipation ranges, that we shall call near-dissipation range. It is argued that intermittency is multi...
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ژورنال
عنوان ژورنال: Physical Review E
سال: 2010
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.82.047301