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Energy flux enhancement, intermittency and turbulence via Fourier triad phase dynamics in the 1-D Burgers equation

Published online by Cambridge University Press:  06 July 2018

Brendan P. Murray  and
Miguel D. Bustamante Open the ORCID record for Miguel D. Bustamante [Opens in a new window]
Brendan P. Murray
Affiliation:
Institute for Discovery, Department of Mathematics and Statistics, University College Dublin, Belfield D4, Ireland
Miguel D. Bustamante*
Affiliation:
Institute for Discovery, Department of Mathematics and Statistics, University College Dublin, Belfield D4, Ireland
*
†Email address for correspondence: miguel.bustamante@ucd.ie
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Abstract

We present a theoretical and numerical study of Fourier-space triad phase dynamics in the one-dimensional stochastically forced Burgers equation at Reynolds number $Re\approx 2.7\times 10^{4}$. We demonstrate that Fourier triad phases over the inertial range display a collective behaviour characterised by intermittent periods of synchronisation and alignment, reminiscent of the Kuramoto model (Chemical Oscillations, Waves, and Turbulence, Springer, 1984) and directly related to collisions of shocks in physical space. These periods of synchronisation favour efficient energy fluxes across the inertial range towards small scales, resulting in strong bursts of dissipation and enhanced coherence of the Fourier energy spectrum. The fast time scale of the onset of synchronisation relegates energy dynamics to a passive role: this is further examined using a reduced system with the Fourier amplitudes fixed in time – a phase-only model. We show that intermittent triad phase dynamics persists without amplitude evolution and we broadly recover many of the characteristics of the full Burgers system. In addition, for both full Burgers and phase-only systems the physical-space velocity statistics reveals that triad phase alignment is directly related to the non-Gaussian statistics typically associated with structure-function intermittency in turbulent systems.

JFM classification

Turbulent Flows: Intermittency Compressible Flows: Shock waves Turbulent Flows: Turbulence theory
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 850 , 10 September 2018 , pp. 624 - 645
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Copyright
© 2018 Cambridge University Press 

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