The tachocline is a thin shear layer located near the interface between the uniformly rotating radiative zone and the differentially rotating convective zone in the Sun. Indeed, helioseismic observations (Schou et al. 1998; Gough 2007) reveal that the base of the convection zone has an angular velocity profile Ωcz(θ) consistent with Ωcz(θ) = Ωeq(1− a cos 2 θ − b cos θ) with Ωeq = 2.9× 10 s, a =...

Present available interior models of giant planets assume that the internal transport of energy is entirely convective and, accordingly, rule out any possibility of radiative transport. New opacity calculations at temperatures and densities occurring within the giant planets, taking into account H2H2 and H2-He collision-induced absorption as well as infrared and visible absorption due to hydrog...

We develop a generalized approximation method (GAM) to obtain solution of a steady state one-dimensional nonlinear convective-radiative-conduction equation. The GAM generates a bounded monotone sequence of solutions of linear problems. The sequence of approximants converges monotonically and rapidly to a solution of the original problem. We present some numerical simulation to illustrate and co...

Motivated by recent experimental and numerical results, a simple unifying picture of intermittency in turbulent shear flows is suggested. Integral structure functions (ISF), taking into account explicitly the shear intensity, are introduced on phenomenological grounds. ISF can exhibit a universal scaling behavior, independent of the shear intensity. This picture is in satisfactory agreement wit...

This study focuses on the effects of subgrid (on general circulation model (GCM) scales) convective venting of the planetary boundary layer to the free troposphere and on the interactive effects of aerosols, ozone, UV actinic flux, and radiative forcing of climate. We developed a single-column chemical transport model (SCCTM) consistent with the global Goddard Earth Observing System (GEOS) GCM ...

A computational uid dynamics and heat transfer analysis is performed to determine the convection and radiation heat transfer from an impinging ame jet to a plane surface. This paper focuses on analyzing the behavior of an impinging ame jet, including buoyancy e ects, turbulence in uence, and convective and radiative heat transfer processes. The combustion is modeled using a 12-species probabili...

We present numerical simulations of convective overshoot in a twodimensional model of the solar equatorial plane. The simulated domain extends from 0.001 R⊙ to 0.93 R⊙, spanning both convective and radiative regions. We show that convective penetration leads to a slightly extended, mildly subadiabatic temperature gradient beneath the convection zone below which there is a rapid transition to a ...