scholarly journals Numerical study of natural convection and acoustic waves using the lattice Boltzmann method

Heat Transfer ◽  
2020 ◽  
Vol 49 (6) ◽  
pp. 3779-3796
Author(s):  
Jaouad Benhamou ◽  
Mohammed Jami ◽  
Ahmed Mezrhab ◽  
Valéry Botton ◽  
Daniel Henry
Keyword(s):  
Natural Convection ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Acoustic Waves ◽  
Numerical Study ◽  
Boltzmann Method

Numerical study of natural convection of nanofluid in a semi-circular cavity with lattice Boltzmann method

2019 ◽  
Vol 30 (5) ◽  
pp. 2625-2637 ◽  
Author(s):  
Hanieh Nazarafkan ◽  
Babak Mehmandoust ◽  
Davood Toghraie ◽  
Arash Karimipour
Keyword(s):  
Natural Convection ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Volume Fraction ◽  
Numerical Study ◽  
Solid Volume Fraction ◽  
Circular Cavity ◽  
Cu Nanoparticles ◽  
Content Type ◽  
Boltzmann Method

Purpose This study aims to apply the lattice Boltzmann method to investigate the natural convection flows utilizing nanofluids in a semicircular cavity. The fluid in the cavity is a water-based nanofluid containing Al2O3 or Cu nanoparticles. Design/methodology/approach The study has been carried out for the Rayleigh numbers from 104 to 106 and the solid volume fraction from 0 to 0.05. The effective thermal conductivity and viscosity of nanofluid are calculated by the models of Chon and Brinkman, respectively. The effects of solid volume fraction on hydrodynamic and thermal characteristics are investigated and discussed. The averaged and local Nusselt numbers, streamlines, temperature contours for different values of solid volume fraction and Rayleigh number are illustrated. Findings The results indicate that more solid volume fraction corresponds to more averaged Nusselt number for both types of nanofluids. It is also found that the effects of solid volume fraction of Cu are stronger than those of Al2O3. Originality/value Numerical study of natural convection of nanofluid in a semi-circular cavity with lattice Boltzmann method in the presence of water-based nanofluid containing Al2O3 or Cu nanoparticles.

scholarly journals Simulation of Natural Convection in a horizontal channel with heat sources mounted with porous blocks by the lattice Boltzmann method (MRT-LBM)

2020 ◽  
Vol 307 ◽  
pp. 01009
Author(s):  
Kaoutar BOUARNOUNA ◽  
Abdelkader BOUTRA ◽  
Mahdi BENZEMA ◽  
Mohammed El Ganaoui ◽  
Youb Khaled BENKAHLA
Keyword(s):  
Natural Convection ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Numerical Study ◽  
Darcy Number ◽  
Horizontal Channel ◽  
Multiple Relaxation Time ◽  
Porous Blocks ◽  
Transfer Structure ◽  
Boltzmann Method

In this paper, laminar natural convection in a horizontal channel provided with porous blocks periodically distributed on its lower adiabatic surface has been analyzed. This numerical study is based on the multiple-relaxation-time (MRT) Lattice Boltzmann method (LBM). The two-dimensional model D2Q9 is adopted to solve the flow field, while the D2Q5 model is applied to solve the temperature field. The objective of the study is to analyze the effect of the Darcy number (10-1 ≤ Da ≤ 10-6), Rayleigh number (103 ≤ Ra ≤ 107) and the relative porous blocks height (1/8 ≤ D ≤ 1/2). The obtained results show the important effect of these parameters, which cannot be neglected, on both flow and the heat transfer structure, within this kind of channels.

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