TITLE:
Modelling Turbulent Heat Transfer in a Natural Convection Flow
AUTHORS:
Claudia Zimmermann, Rodion Groll
KEYWORDS:
Turbulent Natural Convection, Compressible Flow, Large-Eddy Simulation, Heat Transfer
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.2 No.7,
June
20,
2014
ABSTRACT: In this paper a numerical study of a turbulent, natural convection
problem is performed with a compressible Large-Eddy simulation. In a natural
convection the fluid is accelerated by local density differences and a
resulting pressure gradient. Directly at the heated walls the temperature
distribution is determinate by increasing temperature gradients. In the centre
region convective mass exchange is dominant. Density changes due to temperature
differences are considered in the numerical model by a compressible coupled model. The obtained numerical results of this
study are compared to an analogue experimental setup. The fluid properties
profiles, e.g. temperature and velocity, show an asymmetry which is caused by
the non-Boussinesq effects of the fluid. The investigated Rayleigh number of
this study lies at Ra = 1.58 × 109.