Effects of different boundary conditions at the surfaces of the extended computational domain on buoyancy driven natural convection flow in a three dimensional open cavity are studied numerically. This study is carried out for turbulent flow where Rayleigh number is greater than 108. Air is used as working fluid having properties at 25°C temperature and 1atm pressure. To capture the turbulent nature of the flow k - ? model is used. ANSYS CFX software is used to solve the governing equations subject to the corresponding boundary conditions. The methodology is verified through a satisfactory comparison with some published results. Average mass flow, temperature, stream line, contour velocity and velocity profile are studied at different height. An extended computational domain around the physical domain of the cavity at different surrounding conditions is considered to investigate the effect of its existence on the computation. Effects of different surrounding boundary conditions on the physical domain of the cavity are studied and reported.A relation among non-dimensional parameters such as Nusselt number, Rayleigh number, Prandlt number and Reynolds number is also reported.Dhaka Univ. J. Sci. 64(1): 31-37, 2016 (January)
urban environment studies have become more and more critical in the past decades because of the rapid development of urbanization in industrial countries. Temperature, velocity, average mass flow, etc. at different unit on the top floor of a multistory building are discussed here. For the numerical computation of the air flow inside the building rooms, the k−ε turbulence model is used. ANSYS CFX software is used to solve the governing equations. For modeling the building, Bangladesh's national building code is applied. The turbulence model is also validated by comparing the result with an experimental result and a numerical result. Satisfactory ventilation rate is also ensured by comparing the result with ANSI/ASHRAE Standard 62.1-2004. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 161-178, 2020
The buoyancy driven natural convection flowin an open cavity has become an important issue to study. In this study, the difficulties of computing natural convection flow in open cavity with an extended computational domain around the cavity are reported. The k ε − turbulence model is used for the computation to capture the turbulence nature of the air flow inside the cavity. ANSYS CFX software is used to solve the governing equations in this study. Effects of different aspect ratio and different temperature at the left wall and thus the temperature difference between the left and the right walls are analyzed numerically as well. Average mass flow, temperature, velocity etc. at different location in the cavity for different boundary conditions are studied and reported. A comparison between the present work and a previous work is also reported here to validate the methodology. Finally, relations among non-dimensional parameters (e.g. Ra, Re, Pr, Nu numbers) are also presented.
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