Structures, profile consistency, and transport scaling in electrostatic convection

摘要: Two mechanisms at the origin of profile consistency in models electrostatic turbulence magnetized plasmas are considered. One involves turbulent diffusion collisionless and subsequent equipartition Lagrangian invariants. By very nature its definition, this state can only be reached absence imposed fluxes transported quantities. As such, concept cannot used to interpret profiles numerical simulations interchange modes, as it has nevertheless been done past. It is shown article that for fact due mixing by persistent large-scale convective cells. This mechanism not a diffusion, occur systems, analog well-known laminar “magnetic flux expulsion” magnetohydrodynamics. expulsion process “pinch” across closed streamlines further results formation pressure fingers along separatrix nature, these coherent structures dissipative because leads their relies on finite amount collisional diffusion. Numerical two-dimensional modes confirm role cells structure formation. They also show fingerlike ultimately control rate heat transport plasma layer thus scaling large Rayleigh numbers. contradicts mixing-length arguments which do account processes. For problem formation, consistency, intimately linked.