A. Takayama et M. Wakatani, GENERATION OF SHEARED FLOW AND ITS EFFECT ON TRANSPORT BASED ON NONLINEAR INTERCHANGE MODE, Journal of the Korean Physical Society, 31, 1997, pp. 167-170
Nonlinear evolution of interchange mode is investigated in a scrape-of
f layer plasma with unfavorable magnetic curvature using both a direct
numerical simulation of nonlinear MHD model and a low-order dynamical
model. Both results show that when the Rayleigh number exceeds a crit
ical value, the zonal counter-streaming flow is generated in the perpe
ndicular direction to the ambient magnetic field, which makes the fluc
tuation level suppress. The reduction of transport is not stationary,
but oscillatory or intermittent, which resembles the behavior of the E
dge Localized Mode observed in tokamak H-mode experiments. The low-ord
er model is usable to investigate mechanism of sheared flow generation
during the nonlinear evolution of interchange mode.