8-12 July 2013
Modelling Stellar Convection
Presented by Mr. Matthew JOHNSON on 10 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Track: Track D1 - Astrophysics
Current stellar models rely on mixing length theory for the description of convection in the stellar material. Mixing length theory is an attempt to construct a computationally tractable theory of convection by analog with molecular transport mechanisms. It is used in all current stellar models. However, it suffers from several faults because of its simplistic representation of convection. In this project, I am investigating the possibility of replacing mixing length theory with alternative, more realistic theories of convection which are nevertheless computationally tractable. For example, a finite difference based simulation of the incompressible Navier-Stokes and Boussinesq equations. With the use of MPI to facilitate parallelisation, these simulations can be run on an appropriate scale for studying stellar convection. Preliminary investigations indicate the rate of heat transfer as predicted by mixing length theory is grossly underestimated in some regions. Results of this study may ultimately impact on the understanding of galaxy evolution.
Dr. Fabio Frescura, University of the Witwatersrand