Non-Oberbeck–Boussinesq zonal flow generation

Nuclear Fushion

article

M. Held¹  M. Wiesenberger²  R. Kube³  A. Kendl¹ 

[1] Institute for Ion Physics and Applied Physics, Universität Innsbruck;Department of Physics, Technical University of Denmark;Department of Physics and Technology, UiT The Arctic University of Norway

关键词: zonal flows;    poloidal rotation;    non-Oberbeck–Boussinesq effects;    full-F gyro/drift-fluid theory;    Reynolds stress;    Favre stress;   

DOI  :  10.1088/1741-4326/aad28e

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

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.

【 授权许可】

Unknown