Abstract
The realizable Markovian closure (RMC) developed by Bowman et al. [Phys. Fluids B 5 (1993) 3558] is employed to study the Hasegawa-Wakatani model, a paradigm for resistive drift-wave turbulence. Turbulent transport, spectral properties, and energy-transfer directions are discussed. For second-order statistics, the closure predictions are in excellent agreement with direct numerical simulations. A marked depression of the hydrodynamic flux from its quasilinear value is well predicted by the RMC and is explained without reference to “coherent structures”.
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