Numerical analysis of free convection and entropy generation in a cavity using compact finite-difference lattice Boltzmann method
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 28 October 2019
Issue publication date: 3 February 2020
Abstract
Purpose
The purpose of this paper is to investigate the compact finite-difference lattice Boltzmann method is used to simulate the free convection within a cavity.
Design/methodology/approach
The finite-difference discretization method enables the numerical simulations to be run when there are non-uniform and curvilinear grids with a finer near-wall grid resolution. Furthermore, the high-order method is applied in the numerical approach, which makes it possible to go with relatively coarse mesh in respect to simulations, which used classical lattice Boltzmann method. The configuration of the cavity is set to sine-walled square. In addition, the cavity is filled with Al2O3-water nanofluid, and the Koo–Kleinstreuer–Li model is used to estimate the properties of nanofluid.
Findings
The nanoparticle (Al2O3) concentration in the base fluid (water) is considered in a range of 0-0.04. The nanofluid flow and heat transfer are investigated in laminar regime with Rayleigh number in the range of 103-106. The second law analysis is used to study the effects of different governing parameters on the local and volumetric entropy generation. The Rayleigh number, configuration of the cavity and nanoparticle concentration are considered as the governing parameters. The results are mainly focused on the flow structure, temperature field, local and volumetric entropy generation and heat transfer performance.
Originality/value
The originality of this study is using of a modern numerical method supported by an accurate prediction for nanofluid properties to simulate the flow and heat transfer during natural convection in a cavity.
Keywords
Acknowledgements
Retraction notice: The publishers of International Journal of Numerical Methods for Heat & Fluid Flow wish to retract the article “Numerical analysis of free convection and entropy generation in a cavity using compact finite-difference lattice Boltzmann method” by H. KhakRah, P. Hooshmand, D. Ross and M. Jamshidian which appeared in Volume 30, Issue 2, 2020.
It has come to our attention that there are concerns regarding the identity of the author “David Ross” and the originality of this paper. A reasonable description of authors’ contribution to the paper has not been provided and concerns regarding its originality have not been addressed.
Despite numerous attempts to contact the authors, the journal has received no response; the response of the authors would be gratefully received.
The International Journal of Numerical Methods for Heat & Fluid Flow submission guidelines make it clear that only those who have made a substantial contribution to the article should be credited as authors and that articles must be original. The publishers of the journal sincerely apologize to the readers.
Citation
KhakRah, H., Hooshmand, P., Ross, D. and Jamshidian, M. (2020), "Numerical analysis of free convection and entropy generation in a cavity using compact finite-difference lattice Boltzmann method", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 2, pp. 977-995. https://doi.org/10.1108/HFF-07-2019-0532
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited