Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
661927 | International Journal of Heat and Mass Transfer | 2006 | 9 Pages |
Abstract
To simulate turbulent convection at high Rayleigh number (Ra), we propose a new thermal lattice-BGK (LBGK) model based on large eddy simulation (LES). Two-dimensional numerical simulations of natural convection with internal heat generation in a square cavity were performed at Ra from 106 to 1013 with Prandtl numbers (Pr) at 0.25 and 0.60. Simulation results indicate that our model is fit to simulate high Ra flow for its better numerical stability. At Ra = 1013, a global turbulent has occurred. With a further increase in Ra, the flow will arrive in a fully turbulence regime. The Nusselt–Rayleigh relationship is also discussed.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Hongjuan Liu, Chun Zou, Baochang Shi, Zhiwei Tian, Liqi Zhang, Chuguang Zheng,