Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328.1114p&link_type=abstract
Astronomische Nachrichten, Vol.328, Issue 10, p.1114
Astronomy and Astrophysics
Astronomy
6
Convection, Hydrodynamics, Stars: Late-Type, Stars: Rotation, Turbulence
Scientific paper
The first 3-D non-linear hydrodynamical simulation of the inner convective envelope of a rotating low mass red giant star is presented. This simulation, computed with the ASH code, aims at understanding the redistribution of angular momentum and heat in extended convection zones. The convection patterns achieved in the simulation consist of few broad and warm upflows surrounded by a network of cool downflows. This asymmetry between up and downflows leads to a strong downward kinetic energy flux, that must be compensated by an overluminous enthalpy flux in order to carry outward the total luminosity of the star. The influence of rotation on turbulent convection results in the establishment of large-scale mean flows: a strong radial differential rotation and a single cell poleward meridional circulation per hemisphere. A detailed analysis of angular momentum redistribution reveals that the meridional circulation transports angular momentum outward in the radial direction and poleward in the latitudinal direction, with the Reynolds stresses acting in the opposite direction. This simulation indicates that the classical hypothesis of mixing length theory and solid-body rotation in the envelope of red giants assumed in 1-D stellar evolution models are unlikely to be realized and thus should be reconsidered.
Brun Allan Sacha
Palacios Alex
No associations
LandOfFree
Simulation of turbulent convection in a slowly rotating red giant star does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simulation of turbulent convection in a slowly rotating red giant star, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulation of turbulent convection in a slowly rotating red giant star will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1526683