Abstract
Numerical flow simulations are used to study the effect of coherent structures on transport in the context of a two-field, two-dimensional model of dissipative drift-wave turbulence. The presence and nature of structures are found to depend on the adiabaticity parameter α=k∥2 VT2/2νeiωs which controls the degree to which the electrons respond to parallel electric fields. Transport estimates based on quasilinear and mixing-length models are compared with the simulations. In the regime with long-lived coherent structures, the turbulent particle transport predicted by a standard quasilinear or mean-field estimate is found to exceed that actually observed in the presence of coherent structures.
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