Interaction of internal gravity waves with a horizontal shear flow in the absence of potential vorticity perturbations is investigated making use of closed-form solutions. Localized wave packet trajectories are obtained, the energy growth mechanisms occurring are identified, and the potential role of perturbation growth in wave breaking is assessed. Regarding meridional propagation, the wave pa...

In the solar convection zone, rotation couples with intensely turbulent convection to build global-scale flows of differential rotation and meridional circulation. Our sun must have rotated more rapidly in its past, as is suggested by observations of many rapidly rotating young solar-type stars. Here we explore the effects of more rapid rotation on the patterns of convection in such stars and t...

A simple multilayer-zonally symmetric model, using a multicloud convective parameterization and coupled to a dynamical bulk atmospheric boundary layer, is used here to simulate boreal summer intra-seasonal oscillations (BSISO) in the summer monsoon trough and elucidate the underlying main physical mechanisms responsible for their initiation, propagation, and termination. Northward-moving precip...

Axisymmetric spherical Couette flow between two concentric differentially rotating spheres is computed numerically as an initial-value problem. The time-independent spherical Couette flows with zero, one and two Taylor vortices computed in our simulations are found to be reflection-symmetric about the equator despite the fact that our pseudospectral numerical method did not impose these propert...

A simple formula was recently proposed by Williams @J. Acoust. Soc. Am. 99, 2022–2032 ~1996!# for imaging pressure and velocity on a vibrating circular cylindrical shell using the far-field pressure measured along a meridional semicircle. The method is examined and some new results are obtained. The procedure is generalized to handle cylindrical surfaces of noncircular but convex cross section....

Context. In its evolution, the MWC 656 binary system, consisting of a Be star and black hole, has gone through common envelope stage. The O B stars early spectral subclasses can be characterised by lower rotational velocities increased frequency. in system may have undergone rapid rotation during Aims. We study change star’s state due to an increase angular momentum stage immediately afterwards...

With data from 12 coupled models in the 4th Assessment Report of the Intergovernmental Panel on Climate Change (IPCC-AR4), climate under year 2000 greenhouse gas (GHG) + aerosol forcing was compared with climate under pre-industrial conditions. In the tropical Pacific, the warming in the mean sea surface temperatures (SST) was found to have an El Niño-like pattern, while both the equatorial zon...

This research adopts the quasi three-dimensional hydraulic design method for the impeller of high specific speed mixed-flow pump to achieve the purpose of verifying the hydraulic design method and improving hydraulic performance. Based on the two families of stream surface theory, the direct problem is completed when the meridional flow field of impeller is obtained by employing iterative calcu...

Disk accretion onto a slowly rotating neutron star with a weak magnetic field H < 3 × 10 gauss is considered in a wide range of luminosities 1/100 < L/Ledd < 1, where Ledd is the Eddington luminosity. We construct a theory for the deceleration of rotation and the spread of matter over the stellar surface in the shallow-water approximation. The rotation slows down due to friction against the den...

The Reynolds stress induced by anisotropically forcing an unbounded Couette flow, with uniform shear g, on a b plane, is calculated in conjunction with the eddy diffusivity of a coevolving passive tracer. The flow is damped by linear drag on a time scale m. The stochastic forcing is white noise in time and its spatial anisotropy is controlled by a parameter a that characterizes whether eddies a...