منابع مشابه
Wave Generation by Turbulent Convection
We consider wave generation by turbulent convection in a plane parallel, stratified atmosphere that sits in a gravitational field, g. The atmosphere consists of two semi-infinite layers, the lower adiabatic and polytropic and the upper isothermal. The adiabatic layer supports a convective energy flux given by mixing length theory; Fe ""'pv~, where pis mass density and v8 is the velocity of the ...
متن کاملInternal Wave Excitation by Turbulent Convection
Convection near a stably stratified region can excite internal gravity waves. This occurs in a wide range of geophysical settings, including the Earth’s atmosphere and core, as well as in astrophysical systems like some gas giants like Saturn, and most stars including the sun. In each of these circumstances, the wave excitation mechanism and subsequent wave energy flux spectrum is of great inte...
متن کاملNumerical simulations of internal wave generation by convection in water.
Water's density maximum at 4°C makes it well suited to study internal gravity wave excitation by convection: an increasing temperature profile is unstable to convection below 4°C, but stably stratified above 4°C. We present numerical simulations of a waterlike fluid near its density maximum in a two-dimensional domain. We successfully model the damping of waves in the simulations using linear t...
متن کاملGeneration of Large-scale Semi-organized Structures in Turbulent Convection
In the last decades it has been recognized that the very high Rayleigh number convective boundary layer (CBL) has more complex nature than might be reckoned. Besides the fully organized component naturally considered as the mean flow and the chaotic small-scale turbulent fluctuations, one more type of motion has been discovered, namely, long-lived large-scale structures, which are neither turbu...
متن کاملTrends Turbulent convection
Convection in a fluid heated from below, known as Rayleigh-Bénard convection, is an important turbulent process that occurs in the sun, planetary atmospheres, industrial manufacturing, and many other places. Physicists and engineers have made much progress in understanding this phenomenon in simple laboratory geometries, but still have a way to go before they are able to extrapolate to the extr...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1990
ISSN: 0004-637X,1538-4357
DOI: 10.1086/169376