Related Articles Investigation of turbulence in reversed field pinch plasma by using microwave imaging reflectometry Phys. Plasmas 18, 102315 (2011) Scale-selective turbulence reduction in H-mode plasmas in the TJ-II stellarator Phys. Plasmas 18, 102302 (2011) Equilibrium velocity distributions in parallel propagating low-frequency Alfvénic turbulence Phys. Plasmas 18, 092118 (2011) Ion-cyclotr...

Observations of quantum turbulence in pure superfluid 4He in a rotating container are reported. Large-scale forcing through rotational oscillations of the cubic container and detecting of turbulence via monitoring ion transport along the axis of rotation were used. Near the axial walls, with increasing forcing the vortex tangle grows without an observable threshold. This tangle gradually develo...

Quasi-two-dimensional decaying turbulence is studied in a flowing soap film by measuring the moments of the probability density function P„dv(r)... for the longitudinal velocity differences dv(r) on a scale r. As in three-dimensional ~3-D! turbulence, P becomes non-Gaussian with decreasing r. The third moment S3(r)[^„dv(r)... & is small and negative at small scales, but becomes positive at larg...

The question of which length scale equation to use in models of turbulence has long been controversial and several approaches have been suggested and used in the past. In this paper, we demonstrate that all these approaches are equivalent and the inconsistencies in the use of some of these approaches arise from improper modeling of the diffusion term in the length scale equation. We formulate a...

We describe flame propagation in a channel subject to a Poiseuille flow, within the thermo-diffusive approximation and an adiabatic context. The two-dimensional flame fronts addressed may be either assisted or opposed by the flow. The problem is characterized by two parameters, the intensity of the flow u0 and the spatial scale e. The total burning rate and the propagation speed are determined ...

Modelling encounter rates between planktonic predators and prey in turbulent waters requires an estimate of a spatial scale. One spatial scale proposed in the literature based on prey concentration is shown to be systematically inconsistent and its use is shown to imply that plankton sampllng methodology can bias encounter rate estimates in turbulent situations. We show that a scale based on th...

Classically, large-scale forced turbulence is characterized by a transfer of energy from large to small scales via nonlinear interactions. We have investigated the changes in this energy transfer process in broadband forced turbulence where an additional perturbation of flow at smaller scales is introduced. The modulation of the energy dynamics via the introduction of forcing at smaller scales ...

Abstract. The turbulent dynamo action in a shear flow is considered by making use of a quasilinear approximation and neglecting the back-reaction of a generated magnetic field on turbulence. The shear can stretch turbulent magnetic field lines in such a way that turbulent motions may become suitable for the generation of a large-scale magnetic field even in the absence of any stratification. Th...

Turbulence is the most common state of astrophysical flows. In typical astrophysical fluids, turbulence is accompanied by strong magnetic fields, which has a large impact on the dynamics of the turbulent cascade. Recently, there has been a significant breakthrough on the theory of magnetohydrodynamic (MHD) turbulence. For the first time we have a scaling model that is supported by both observat...

The interaction of a laser-induced plasma with isotropic turbulence is studied using numerical simulations. The simulations use air as the working fluid and assume local thermodynamic equilibrium. The numerical method is fully spectral and uses a shockcapturing scheme in a corrector step. A model problem involving the effect of energy deposition on an isolated vortex is studied as a first step ...