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
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Plasma Physics"
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
Correlation between zonal flow shearing and entropy transfer rates in toroidal ion temperature gradient turbulence
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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
Zonal Flow Solver (ZFS): a highly efficient multi-physics simulation framework
Sign Up to like & getrecommendations! Published in 2020 at "International Journal of Computational Fluid Dynamics"
DOI: 10.1080/10618562.2020.1742328
Abstract: Multi-physics simulations are at the heart of today's engineering applications. The trend is towards more realistic and detailed simulations, which demand highly resolved spatial and temporal scales of various physical mechanisms to solve engineering problems… read more here.
Keywords: multi physics; zonal flow; flow solver; physics ... See more keywords
A unified theory of zonal flow shears and density corrugations in drift wave turbulence
Sign Up to like & getrecommendations! Published in 2021 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/abd618
Abstract: A unified theory of zonal flow shears and density corrugations in drift wave turbulence is presented. Polarization and density advection beat excitation are studied in combination with modulational response. Noise is driven by two-time flux… read more here.
Keywords: turbulence; flow shears; unified theory; zonal flow ... See more keywords
Spatio-temporal structure of turbulent Reynolds stress zonal flow drive in 3D magnetic configuration
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DOI: 10.1088/1367-2630/aa67af
Abstract: The poloidal dependence of the zonal flow drive and the underlying Reynolds stress structure are studied at the stellarator experiment TJ-K by means of a poloidal Langmuir-probe array. This gives the unique possibility to study… read more here.
Keywords: zonal flow; geometry; flow drive; reynolds stress ... See more keywords
Impact of impurities on zonal flow driven by trapped electron mode turbulence
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DOI: 10.1088/1741-4326/aa8549
Abstract: The impact of impurities on the generation of zonal flow (ZF) driven by collisonless trapped electron mode (CTEM) turbulence in deuterium (D)-tritium (T) plasmas is investigated. The expression for ZF growth rate with impurities is… read more here.
Keywords: flow driven; trapped electron; impact impurities; electron mode ... See more keywords