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Interaction of large scale flow structures with gyrokinetic turbulence

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McMillan, Ben 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. doi:10.1063/1.3656947

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

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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.

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
Official Date: November 2011
Dates:
DateEvent
November 2011Published
Volume: Vol.18
Number: No.11
Page Range: p. 112503
DOI: 10.1063/1.3656947
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

Data sourced from Thomson Reuters' Web of Knowledge

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