Non-Oberbeck–Boussinesq zonal flow generation

M. Held, Matthias Wiesenberger, R. Kube, A. Kendl

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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.
Original languageEnglish
Article number104001
JournalNuclear Fusion
Issue number10
Number of pages7
Publication statusPublished - 2018


  • Zonal flows
  • Oloidal rotation
  • Non-Oberbeck-Bousinessq effects
  • Full-F gyro/drift-fluid theory
  • Reynolds stress
  • Favre stress


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