Non-Oberbeck-Boussinesq zonal flow generation

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.

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• Numerical turbulence simulations of intermittent fluctuations in the scrape-off layer of magnetized plasmas
• Turbulent kinetic energy in 2D isothermal interchange-dominated scrape-off layer ExB drift turbulence: Governing equation and relation to particle transport
• The collisional drift wave instability in steep density gradient regimes