Turbulence Evolution in Plasma Shear Flows
نویسندگان
چکیده
منابع مشابه
Supertransient magnetohydrodynamic turbulence in Keplerian shear flows.
A subcritical transition to turbulence in magnetized Keplerian shear flows is investigated by using a statistical approach. Three-dimensional numerical simulations of the shearing box equations with zero net magnetic flux are employed to determine the transition from decaying to sustained turbulence as a function of the magnetic Reynolds number R{m}. The results reveal no clear transition to su...
متن کاملDoes flow shear suppress turbulence in nonionized flows?*
The suppression of turbulence by mean flow shear is shown to apply to nonionized flows as well as plasmas. However, besides the criterion that the shearing rate exceed the turbulent decorrelation rate, there are three additional conditions. These stipulate that the shear flow must be stable, that turbulence must remain in the domain of flow shear for longer than an eddy turnover time, and that ...
متن کاملGeometry of turbulence in wall-bounded shear flows: periodic orbits
The dynamical theory of moderate Reynolds number turbulence triangulates the infinite-dimensional Navier-Stokes state space by sets of exact solutions (equilibria, relative equilibria, periodic orbits, ...) which form a rigid backbone which enables us to describe and predict the sinuous motions of a turbulent fluid. We report determination of a set of unstable periodic orbits from close recurre...
متن کاملTemporal evolution of drift-type modes in plasma flows with strong time-dependent velocity shear
The linear and renormalized nonlinear analysis of the temporal evolution of drift-type modes in plasma flows with strong time-varying velocity shear is developed. Analysis is performed in the time domain without spectral decomposition in time and admits time variation of the flow velocity with time scales which may be comparable with turbulent time scales. 52.35.Ra Electronic mail: vmikhailenko...
متن کاملNew Characteristics of Zonal Flows in Multi-scale Plasma Turbulence
The evolution of multi-scale plasma turbulence including resistive MHD and micro-instability is studied based on a 5-field gyrofluid simulation aiming to understand complex nonlinear interaction and turbulent transport. Here we report two new findings on the zonal flow (ZF) characteristics: (1) A robust oscillatory ZF with finite frequency is created in slab geometry for the first time due to t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Plasma and Fusion Research
سال: 2010
ISSN: 1880-6821
DOI: 10.1585/pfr.5.s2015