Year: 2018
Type: article
Abstract: Novel mechanisms for zonal flow (ZF) generation for both large relative density fluctuations and background density gradients are presented. In this non-Oberbeck–Boussinesq (NOB) regime ZFs are driven by the Favre stress, the large fluctuation extension of the Reynolds stress, and by background density gradient and radial particle flux dominated terms. Simulations of a nonlinear full-F gyro-fluid model confirm the predicted mechanism for radial ZF propagation and show the significance of the NOB ZF terms for either large relative density fluctuation levels or steep background density gradients.
Source: Nuclear Fusion
Authors: M. Held, M. Wiesenberger, R. Kube, A. Kendl
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,595
Awards: Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium, Turbulence in the Edge of Magnetised Plasmas: Emergent Structures and Transport, G2731829129, G2808143221, G4108030823, G829439530, G858011915
OpenAlex ID: W2815328641