Volume 131, Number 6, September 2020
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||02 November 2020|
Intermittency, cascades and thin sets in three-dimensional Navier-Stokes turbulence
Department of Mathematics, Imperial College London - London SW7 2AZ, UK
Received: 16 June 2020
Accepted: 2 September 2020
Visual manifestations of intermittency in computations of three-dimensional Navier-Stokes fluid turbulence appear as the low-dimensional or “thin” filamentary sets on which vorticity and strain accumulate as energy cascades down to small scales. In order to study this phenomenon, the first task of this paper is to investigate how weak solutions of the Navier-Stokes equations can be associated with a cascade and, as a consequence, with an infinite sequence of inverse length scales. It turns out that this sequence converges to a finite limit. The second task is to show how these results scale with integer dimension and, in the light of the occurrence of thin sets, to discuss the mechanism of how the fluid might find the smoothest, most dissipative class of solutions rather than the most singular.
PACS: 47.27.Gs – Isotropic turbulence; homogeneous turbulence / 47.53.+n – Fractals in fluid dynamics / 47.10.ad – Navier-Stokes equations
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