Stability analysis of Reynolds stress response functional candidates

Dafinger, M.; Hallatschek, K.; Itoh, K.

doi:10.1063/1.4795299

Cited by 2 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many mechanisms, e . g ., higher order kinetics of flow-fluctuation interaction 13 14 , possible role of eddies in phase space 15 , interaction with Generalized Kelvin-Helmholtz (GKH) 16 etc., have been discussed theoretically. In addition, in planetary and geophysical fluids, such as the Jovian atmosphere, eddies of various scales are also organized in zonal flow-Rossby wave dynamics 17 .…”

mentioning

confidence: 99%

Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

Arakawa

Inagaki

Sasaki

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

Turbulence and its structure formation are universal in neutral fluids and in plasmas. Turbulence annihilates global structures but can organize flows and eddies. The mutual-interactions between flow and the eddy give basic insights into the understanding of non-equilibrium and nonlinear interaction by turbulence. In fusion plasma, clarifying structure formation by Drift-wave turbulence, driven by density gradients in magnetized plasma, is an important issue. Here, a new mutual-interaction among eddy, drift wave and flow in magnetized plasma is discovered. A two-dimensional solitary eddy, which is a perturbation with circumnavigating motion localized radially and azimuthally, is transiently organized in a drift wave – zonal flow (azimuthally symmetric band-like shear flows) system. The excitation of the eddy is synchronized with zonal perturbation. The organization of the eddy has substantial impact on the acceleration of zonal flow.

show abstract

mentioning

confidence: 99%

Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

Arakawa

Inagaki

Sasaki

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…We here take a more simplified, zero-dimensional model, in order to pursue the analytic insight for the transition condition. A characteristic scale length of the radial inhomogeneity is chosen here according to the consideration that the turbulence drive for the flow is the strongest for the particular scale as is given in [30,31]. Following this idea, one can choose the estimate X ∼ −l −2 X, where the scale length l is assumed as prescribed.…”

Section: Zero-dimensional Modelmentioning

confidence: 99%

Zero-dimensional model for the critical condition for the L–H transition in the flux–gradient relation

Itoh

2014

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

In this paper, the physics of the L- to H-mode transition is discussed, focusing on the mechanism induced by the localized mean radial electric field. In addition to the neoclassical effect, an additional source of the electric field is introduced. The influence of turbulence-driven Reynolds stress is taken into account here. The case where the zonal flows are not excited is analysed. Even if the spontaneous zonal flows by turbulence cannot be excited, the bifurcation of the mean radial electric field can occur, if the electric field is strong enough eρpEr/Ti ∼ −1. Hard transition of the electric field takes place. The enhancement of electric field above this critical value can induce a bifurcation in the gradient–flux relation, i.e. the disappearance of the L-mode branch. The critical condition of the heat flux for the onset of transition is obtained.

show abstract

Stability analysis of Reynolds stress response functional candidates

Cited by 2 publications

References 28 publications

Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

Zero-dimensional model for the critical condition for the L–H transition in the flux–gradient relation

Contact Info

Product

Resources

About