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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
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: |
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| 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 |
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