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Effect of the radiative background flux in convection
Author(s) -
Brandenburg A.,
Chan K. L.,
Nordlund A.,
Stein R. F.
Publication year - 2005
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200510411
Subject(s) - radiative transfer , convection , physics , radiative flux , convection zone , mechanics , flux (metallurgy) , turbulence , entropy (arrow of time) , atmospheric sciences , thermodynamics , optics , materials science , metallurgy
Numerical simulations of turbulent stratified convection are used to study models with approximately the same convective flux, but different radiative fluxes. As the radiative flux is decreased, for constant convective flux: the entropy jump at the top of the convection zone becomes steeper, the temperature fluctuations increase and the velocity fluctuations decrease in magnitude, and the distance that low entropy fluid from the surface can penetrate increases. Velocity and temperature fluctuations follow mixing length scaling laws. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)