A Three-Dimensional Lattice Boltzmann-Cellular Automaton Model for Dendritic Solidification Under Convection

2013 ◽  
pp. 493-500
Author(s):  
Mohsen Eshraghi ◽  
Bohumir Jelinek ◽  
Sergio Felicelli
Keyword(s):  
Cellular Automaton ◽  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Cellular Automaton Model ◽  
Dendritic Solidification ◽  
Dimensional Lattice

scholarly journals Three-Dimensional Lattice Boltzmann Modeling of Dendritic Solidification under Forced and Natural Convection

Metals ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 474 ◽  
Author(s):  
Mohsen Eshraghi ◽  
Mohammad Hashemi ◽  
Bohumir Jelinek ◽  
Sergio Felicelli
Keyword(s):  
Natural Convection ◽  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Dendritic Solidification ◽  
Dimensional Lattice ◽  
Lattice Boltzmann Modeling

Investigation of the effects of geometrical parameters, eccentricity and perforated fins on natural convection heat transfer in a finned horizontal annulus using three dimensional lattice Boltzmann flux solver

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mahyar Ashouri ◽  
Mohammad Mehdi Zarei ◽  
Ali Moosavi
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Transfer Rate ◽  
Lattice Boltzmann ◽  
Transfer Rate ◽  
Three Dimensional ◽  
Maximum Heat ◽  
Content Type ◽  
Dimensional Lattice ◽  
Fin Spacing

Purpose The purpose of this paper is to investigate the effects of geometrical parameters, eccentricity and perforated fins on natural convection heat transfer in a finned horizontal annulus using three-dimensional lattice Boltzmann flux solver. Design/methodology/approach Three-dimensional lattice Boltzmann flux solver is used in the present study for simulating conjugate heat transfer within an annulus. D3Q15 and D3Q7 models are used to solve the fluid flow and temperature field, respectively. The finite volume method is used to discretize mass, momentum and energy equations. The Chapman–Enskog expansion analysis is used to establish the connection between the lattice Boltzmann equation local solution and macroscopic fluxes. To improve the accuracy of the lattice Boltzmann method for curved boundaries, lattice Boltzmann equation local solution at each cell interface is considered to be independent of each other. Findings It is found that the maximum heat transfer rate occurs at low fin spacing especially by increasing the fin height and decreasing the internal-cylindrical distance. The effect of inner cylinder eccentricity is not much considerable (up to 5.2% enhancement) while the impact of fin eccentricity is more remarkable. Negative fin eccentricity further enhances the heat transfer rate compared to a positive fin eccentricity and the maximum heat transfer enhancement of 91.7% is obtained. The influence of using perforated fins is more considerable at low fin spacing although some heat transfer enhancements are observed at higher fin spacing. Originality/value The originality of this paper is to study three-dimensional natural convection in a finned-horizontal annulus using three-dimensional lattice Boltzmann flux solver, as well as to apply symmetry and periodic boundary conditions and to analyze the effect of eccentric annular fins (for the first time for air) and perforated annular fins (for the first time so far) on the heat transfer rate.

A parallelized three-dimensional cellular automaton model for grain growth during additive manufacturing

2018 ◽  
Vol 61 (5) ◽  
pp. 543-558 ◽  
Author(s):  
Yanping Lian ◽  
Stephen Lin ◽  
Wentao Yan ◽  
Wing Kam Liu ◽  
Gregory J. Wagner
Keyword(s):  
Additive Manufacturing ◽  
Cellular Automaton ◽  
Grain Growth ◽  
Three Dimensional ◽  
Cellular Automaton Model
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