scholarly journals Nonlinear phase bores in drift wave-zonal flow dynamics

2019 ◽  
Vol 26 (10) ◽  
pp. 102304
Author(s):  
H. Kang ◽  
P. H. Diamond
Keyword(s):  
Zonal Flow ◽  
Flow Dynamics ◽  
Drift Wave ◽  
Nonlinear Phase

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

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
H. Arakawa ◽  
S. Inagaki ◽  
M. Sasaki ◽  
Y. Kosuga ◽  
T. Kobayashi ◽  
...  
Keyword(s):  
Zonal Flow ◽  
Flow Dynamics ◽  
Magnetized Plasma ◽  
Drift Wave

scholarly journals Wave-kinetic approach to zonal-flow dynamics: Recent advances

2021 ◽  
Vol 28 (3) ◽  
pp. 032303
Author(s):  
Hongxuan Zhu ◽  
I. Y. Dodin
Keyword(s):  
Zonal Flow ◽  
Flow Dynamics ◽  
Kinetic Approach ◽  
Recent Advances

scholarly journals On the stability of drift wave spectra with respect to zonal flow excitation

2001 ◽  
Vol 8 (5) ◽  
pp. 1553-1558 ◽  
Author(s):  
M. A. Malkov ◽  
P. H. Diamond ◽  
A. Smolyakov
Keyword(s):  
Zonal Flow ◽  
Wave Spectra ◽  
Drift Wave ◽  
The Stability

scholarly journals Laguerre–Hermite pseudo-spectral velocity formulation of gyrokinetics

2018 ◽  
Vol 84 (1) ◽  
Author(s):  
N. R. Mandell ◽  
W. Dorland ◽  
M. Landreman
Keyword(s):  
Three Dimensional ◽  
Collision Operator ◽  
Zonal Flow ◽  
Phase Mixing ◽  
Final Model ◽  
Nonlinear Phase ◽  
Wide Range ◽  
H Theorem ◽  
Spectral Velocity ◽  
Pseudo Spectral

First-principles simulations of tokamak turbulence have proven to be of great value in recent decades. We develop a pseudo-spectral velocity formulation of the turbulence equations that smoothly interpolates between the highly efficient but lower resolution three-dimensional (3-D) gyrofluid representation and the conventional but more expensive 5-D gyrokinetic representation. Our formulation is a projection of the nonlinear gyrokinetic equation onto a Laguerre–Hermite velocity-space basis. We discuss issues related to collisions, closures and entropy. While any collision operator can be used in the formulation, we highlight a model operator that has a particularly sparse Laguerre–Hermite representation, while satisfying conservation laws and the H theorem. Free streaming, magnetic drifts and nonlinear phase mixing each give rise to closure problems, which we discuss in relation to the instabilities of interest and to free energy conservation. We show that the model is capable of reproducing gyrokinetic results for linear instabilities and zonal flow dynamics. Thus the final model is appropriate for the study of instabilities, turbulence and transport in a wide range of geometries, including tokamaks and stellarators.

scholarly journals Scale selection and feedback loops for patterns in drift wave-zonal flow turbulence

2019 ◽  
Vol 61 (10) ◽  
pp. 105002 ◽  
Author(s):  
Weixin Guo ◽  
Patrick H Diamond ◽  
David W Hughes ◽  
Lu Wang ◽  
Arash Ashourvan
Keyword(s):  
Zonal Flow ◽  
Feedback Loops ◽  
Scale Selection ◽  
Drift Wave ◽  
Flow Turbulence

scholarly journals Secondary instability in drift wave turbulence as a mechanism for zonal flow and avalanche formation

2001 ◽  
Vol 41 (8) ◽  
pp. 1067-1080 ◽  
Author(s):  
P.H. Diamond ◽  
S. Champeaux ◽  
M. Malkov ◽  
A. Das ◽  
I. Gruzinov ◽  
...  
Keyword(s):  
Zonal Flow ◽  
Secondary Instability ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave ◽  
Avalanche Formation

scholarly journals Elasticity in drift-wave–zonal-flow turbulence

2014 ◽  
Vol 89 (4) ◽  
Author(s):  
Z. B. Guo ◽  
P. H. Diamond ◽  
Y. Kosuga ◽  
Ö. D. Gürcan
Keyword(s):  
Zonal Flow ◽  
Drift Wave ◽  
Flow Turbulence
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