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In this paper Lattice Boltzmann simulation of turbulent natural convection with large eddy simulations in tall enclosures which is filled by air with Pr = 0.71 has been studied. Calculations were performed for high Rayleigh numbers (Ra = 10⁷ -10⁹ ) and aspect ratios change between 0.5 and 2 (0.5 < AR < 2). The present results are validated by finds of an experimental research at Ra = 1.58·10⁹ . Effects of the aspect ratios in different Rayleigh numbers are displayed on streamlines, isotherm counters, vertical velocity and temperature at the middle of the cavity, local Nusselt number and average Nusselt number. The average Nusselt number increases with the augmentation of Rayleigh numbers. The increment of the aspect ratio causes heat transfer to decline in different Rayleigh numbers.

Item Type:	Refereed Article
Keywords:	TURBULENT, convection
Research Division:	Engineering
Research Group:	Fluid mechanics and thermal engineering
Research Field:	Experimental methods in fluid flow, heat and mass transfer
Objective Division:	Energy
Objective Group:	Energy transformation
Objective Field:	Energy transformation not elsewhere classified
UTAS Author:	Kefayati, R (Dr Gholamreza Kefayati)
ID Code:	128026
Year Published:	2015
Web of Science® Times Cited:	24
Deposited By:	Engineering
Deposited On:	2018-08-28
Last Modified:	2018-10-17
Downloads:	63 View Download Statistics