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Inverse cascades and resonant triads in rotating and stratified turbulence
(American Institute of Physics, 2017-11)
Kraichnan’s seminal ideas on inverse cascades yielded new tools to study common phenomena in geophysical turbulent flows. In the atmosphere and the oceans, rotation and stratification result in a flow that can be approximated ...
Dual constant-flux energy cascades to both large scales and small scales
(American Institute of Physics, 2017-11)
In this paper, we present an overview of concepts and data concerning inverse cascades of excitation towards scales larger than the forcing scale in a variety of contexts, from two-dimensional fluids and wave turbulence ...
Inverse cascades in turbulence and the case of rotating flows
(IOP Publishing, 2013-07-16)
We first summarize briefly several properties concerning the dynamics of two-dimensional (2D) turbulence, with an emphasis on the inverse cascade of energy to the largest accessible scale of the system. In order to study ...
Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
(Amer Physical Soc, 2013-03)
We present results from an ensemble of 50 runs of two-dimensional hydrodynamic turbulence with spatial resolution of 2048 2 grid points and from an ensemble of 10 runs with 4096 2 grid points. All runs in each ensemble ...
Inverse cascades in rotating stratified turbulence: Fast growth of large scales
(IOP Publishing, 2013-05)
We examine the inverse cascade of kinetic energy to large scales in rotating stratified turbulence as occurs in the oceans and in the atmosphere, while varying the relative frequency of gravity to inertial waves, N/f. Using ...
Tridimensional to bidimensional transition in magnetohydrodynamic turbulence with a guide field and kinetic helicity injection
(American Physical Society, 2016-05)
We study the transition in dimensionality of a three-dimensional magnetohydrodynamic flow forced only mechanically when the strength of a magnetic guide field is gradually increased. We use numerical simulations to consider ...
Anisotropy and nonuniversality in scaling laws of the large-scale energy spectrum in rotating turbulence
(American Physical Society, 2012-09)
Rapidly rotating turbulent flow is characterized by the emergence of columnar structures that are representative of quasi-two-dimensional behavior of the flow. It is known that when energy is injected into the fluid at an ...
Passive scalar cascades in rotating helical and non-helical flows
(IOP Publishing, 2013-07)
We study how helicity affects the spectrum of a passive scalar in rotating turbulent flows, using numerical simulations of turbulent flows with or without rotation and with or without injection of helicity. Scaling laws ...
Network motif as an indicator for cascading outages due to the decrease of connectivity
(IEEE, 2017)
Complex network study pointed out that, between the macro level and the micro level, there still exist abundant various dimensions addressed as subgraph, including motifs, cliques, cores... The structural property of these ...
Helicity cascades in rotating turbulence
(American Physical Society, 2009-12)
The effect of helicity (velocity-vorticity correlations) is studied in direct numerical simulations of rotating turbulence down to Rossby numbers of 0.02. The results suggest that the presence of net helicity plays an ...