A quasi-geostrophic diagnosis of the zonal flow associated with cut-off lows over South Africa and surrounding oceans
Sign Up to like & getrecommendations! Published in 2020 at "Climate Dynamics"
DOI: 10.1007/s00382-020-05401-4
Abstract: The zonal flow associated with cut-off lows (COLs) comprises two jet streaks of different spatial extents. The smaller scale jet streak, located north of the COLs, forms as a result of meridional divergence of vorticity… read more here.
Keywords: jet streak; jet; flow associated; zonal flow ... See more keywords
From zonal flow to convection rolls in Rayleigh–Bénard convection with free-slip plates
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2020.793
Abstract: Abstract Rayleigh–Bénard (RB) convection with free-slip plates and horizontally periodic boundary conditions is investigated using direct numerical simulations. Two configurations are considered, one is two-dimensional (2-D) RB convection and the other one three-dimensional (3-D) RB… read more here.
Keywords: aspect ratio; roll; flow; convection ... See more keywords
Trapped particle precession and sub-bounce zonal flow dynamics in tokamaks
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DOI: 10.1017/s0022377818000119
Abstract: A drift-kinetic calculation in an axisymmetric tokamak, with super-diamagnetic flows, is presented to elucidate the relation between the radial electric field, $E_{r}$ , zonal flows and the rapid precession of the trapped particle (TP) population.… read more here.
Keywords: particle; precession; zonal flow; electric field ... See more keywords
Collisionless zonal-flow dynamics in quasisymmetric stellarators
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DOI: 10.1017/s0022377824001739
Abstract: The linear collisionless plasma response to a zonal-density perturbation in quasisymmetric stellarators is studied, including the geodesic-acoustic-mode oscillations and the Rosenbluth–Hinton residual flow. While the geodesic-acoustic-mode oscillations in quasiaxisymmetric configurations are similar to tokamaks, they… read more here.
Keywords: rosenbluth hinton; collisionless zonal; quasisymmetric stellarators; zonal flow ... See more keywords
The zonal-flow residual does not tend to zero in the limit of small mirror ratio
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Plasma Physics"
DOI: 10.1017/s0022377825000066
Abstract: The intensity of the turbulence in tokamaks and stellarators depends on its ability to excite and sustain zonal flows. Insight into this physics may be gained by studying the ‘residual’, i.e. the late-time linear response… read more here.
Keywords: limit; flow residual; zonal flow; mirror ratio ... See more keywords
Correlation between zonal flow shearing and entropy transfer rates in toroidal ion temperature gradient turbulence
Sign Up to like & getrecommendations! Published in 2019 at "Physics of Plasmas"
DOI: 10.1063/1.5109476
Abstract: The transfer rate of the entropy variable in the wavenumber space perpendicular to the equilibrium magnetic field is evaluated by means of the gyrokinetic simulations of the toroidal ion temperature gradient turbulence. Fluctuations of the… read more here.
Keywords: entropy transfer; flow shearing; transfer; zonal flow ... See more keywords
Nonlinear phase bores in drift wave-zonal flow dynamics
Sign Up to like & getrecommendations! Published in 2019 at "Physics of Plasmas"
DOI: 10.1063/1.5111987
Abstract: A minimal model of nonlinear phase dynamics in drift waves is shown to support phase bore solutions. Coupled nonlinear equations for amplitude, phase, and zonal flow are derived for the Hasegawa-Mima system and specialized to… read more here.
Keywords: phase; drift wave; model; nonlinear phase ... See more keywords
Influence of zonal flow and density on resistive drift wave turbulent transport
Sign Up to like & getrecommendations! Published in 2020 at "Physics of Plasmas"
DOI: 10.1063/5.0025861
Abstract: The generations of zonal flow (ZF) and density (ZD) and their feedback on the resistive drift wave turbulent transport are investigated within the modified Hasegawa-Wakatani model. With proper normalization, the system is only controlled by… read more here.
Keywords: zonal flow; drift wave; transport; flow density ... See more keywords
Wave-kinetic approach to zonal-flow dynamics: Recent advances
Sign Up to like & getrecommendations! Published in 2021 at "Physics of Plasmas"
DOI: 10.1063/5.0043784
Abstract: The basic physics of drift-wave turbulence and zonal flows has long been studied within the framework of the wave-kinetic theory. Recently, this framework has been reexamined from first principles, which has led to more accurate… read more here.
Keywords: kinetic approach; zonal flow; physics; wave kinetic ... See more keywords
Limit cycle oscillations in the zonal-flow-catalyzed interactions of ion-temperature-gradient turbulence
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DOI: 10.1063/5.0226794
Abstract: Limit-cycle oscillations are studied for ion temperature gradient turbulence, which, in the absence of large diamagnetic (mean) shear flows, saturates through energy transfer from unstable modes to large-scale stable modes via zonal-flow intermediary modes. Oscillations… read more here.
Keywords: cycle oscillations; turbulence; zonal flow; ion temperature ... See more keywords
The interaction of turbulence, magnetic islands, and zonal fields in fluid plasma models with cubic non-linearities
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DOI: 10.1063/5.0272394
Abstract: It is shown that the generation of magnetic islands by pressure-gradient-driven turbulence is common across a wide range of conditions. The interaction among the turbulence, the magnetic island, and other large scale structures, namely, the… read more here.
Keywords: islands zonal; magnetic islands; turbulence; zonal flow ... See more keywords