The general aspects of zonal flow physics, their formation, damping and interplay with quasi two dimensional turbulence are explained in the context of magnetized plasmas and quasi-geostrophic fluids with an emphasis on formation and selection of spatial patterns. General features of zonal flows as they appear in planetary atmospheres, rotating convection experiments and fusion plasmas are revi...

A DISTINGUISHING CHARACTERISTIC AMONG PERFECTLY WETTING FLUIDS JOHN MCCUAN Abstract. We consider a cylindrical lm of uid adhering to a rigid cylinder of xed radius. The main result is to give the critical (maximum) length for which such a lm of given thickness can be stable. The problem is considered both when the cylinder remains stationary and when the uid and the cylinder are co-rotating at ...

Concentrated suspensions, composed of solid particles and fluids, are used in many industrial applications. In this paper, we study the effects of temperature on the flow of a concentrated (dense) suspension between two long rotating cylinders. The viscosity of the suspension is assumed to depend on temperature and volume fraction of the solid particles. Based on these concepts, a generalized v...

Axisymmetric shapes of Beer, Rosenthal, D. Ross, Gulliver, and others provide universal solutions for a problem related to Plateau's rotating drops, for the material class of Noll's simple incompressible fluid subject to Laplace's frequently used linear constitutive relation between pressure jump and mean curvature at the free boundary. A bifurcation from spheroidal to toroidal shapes occurs wi...

We present a detection scheme for diffusing-wave spectroscopy (DWS) based on a two-cell geometry that allows efficient ensemble averaging. This is achieved by putting a fast rotating diffuser in the optical path between laser and sample. We show that the recorded (multispeckle) correlation echoes provide an ensemble averaged signal that does not require additional time averaging. Furthermore, c...

In this paper we provide fully covariant proofs of some theorems on shearfree perfect fluids. In particular, we explicitly show that any shear-free perfect fluid with the acceleration proportional to the vorticity vector (including the simpler case of vanishing acceleration) must be either non-expanding or non-rotating. We also show that these results are not necessarily true in the Newtonian c...

A variational principie is presented which characterises steady motions of inviscid, rotating, stratitied fluids. This is used to construct nonlinear solutions corresponding to stationary cold-core and warm-core eddies above topography in a uniform stream. Nurnerical resultç are presented for the specific case of a right circular cylinder. The results show that below a critica1 free-strearn vel...

The flow over a pair of counter-rotating cylinders is investigated numerically and experimentally. It is demonstrated that it is possible to suppress unsteady vortex shedding for gap sizes from one to five cylinder diameters, at Reynolds numbers from 100 to 200, expanding on the more limited work by Chan & Jameson (Intl J. Numer. Meth. Fluids, vol. 63, 2010, p. 22). The degree of unsteady wake ...

Thermodynamics of charged and slowly rotating black holes in 4D Gauss–Bonnet gravity has attracted a great deal attention due to its intrinsic complications rich phase structures. In this paper, we revisit the thermodynamics provide correct thermodynamic volume entropy. Thermodynamic geometries are powerful tool study microstructure holes. Based on Hessian matrix hole mass, introduce geometric ...