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Problems of astrophysical turbulent convection: thermal convection in a layer without boundaries

By R.D. Simitev and F.H. Busse

Abstract

Thermal convection in fluid layers heated from below are usually realized experimentally as well as treated theoretically with fixed boundaries on which conditions for the\ud temperature and the velocity field are prescribed. The thermal and velocity boundary\ud layers attached to the upper and lower boundaries determine to a large extent the properties of turbulent convection at high Rayleigh numbers. Fixed boundaries are often absent\ud in natural realizations of thermal convection. This paper studies the properties of convection driven by a planar heat source below a cooling source of equal size immersed in an\ud otherwise stably stratified fluid layer are studied in this paper. Unavoidable boundaries\ud do not influence the convection flow since they are separated from the active convection\ud layer by nearly motionless stably stratified regions. The onset of convection occurs in an\ud inner unstably stratified region where the mean temperature gradient is reversed. But\ud the region of a reversed horizontally averaged temperature gradient disappears at higher\ud amplitudes of convection such that the vertical derivative of the mean temperature no\ud longer changes its sig

Topics: QA
Publisher: Center for Turbulence Research, Stanford University
Year: 2010
OAI identifier: oai:eprints.gla.ac.uk:49347
Provided by: Enlighten

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  1. (2010). The doi

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