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Interaction of large scale flow structures with gyrokinetic turbulence

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McMillan, B. F., Hill, P. (Peter), Bottino, A., Jolliet, S., Vernay, T. and Villard, L.. (2011) Interaction of large scale flow structures with gyrokinetic turbulence. Physics of Plasmas, Vol.18 (No.11). p. 112503. ISSN 1070-664X

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Official URL: http://dx.doi.org/10.1063/1.3656947

Abstract

Shear flows have a profound influence on turbulence-driven transport in tokamaks. The introduction of arbitrary initial flow profiles into the code ORB5 [Jolliet, Comput. Phys. Commun. 177, 409 (2007)] allows the convenient study of how flows on all length scales both influence transport levels and self-consistently evolve. A formulation is presented which preserves the canonical structure of the background particle distribution when either toroidal or poloidal flows are introduced. Turbulence suppression is possible above a certain shearing rate magnitude for homogeneous shear flows, and little evolution of the shearing rate is seen. However, when a flow with a zone boundary, where the shearing rate reverses at mid-radius, is introduced, the shear flow evolves substantially during the simulation. E x B shear flows with a zone boundary of a positive sign decay to a saturation amplitude, consistent with the well known saturation of turbulently generated zonal flows. Unlike the E x B flow, the parallel flows relax diffusively.

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Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Turbulence -- Mathematical models, Shear flow -- Mathematical models, Tokamaks
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Date:	November 2011
Volume:	Vol.18
Number:	No.11
Page Range:	p. 112503
Identification Number:	10.1063/1.3656947
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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URI:	http://wrap.warwick.ac.uk/id/eprint/41952