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Author: search.filters.author.Bhopalam, S.R.Subject: search.filters.subject.Lattice Boltzmann method

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    Numerical analysis of fluid flows in L-Shaped cavities using Lattice Boltzmann method
    (Elsevier Ltd, 2020) Bhopalam, S.R.; Arumuga Perumal, D.A.
    The current study explores the Two-Relaxation Time (TRT) model of lattice Boltzmann method to compute incompressible flows in L-shaped cavities. Numerical code validation of the developed code with previous results has been initially established. After establishing the credibility of the developed code, the flow characteristics in L-shaped cavities have been studied in detail by considering two kinds of wall motions: single-sided and two-sided (with parallel and anti-parallel wall motions). Additionally, Reynolds numbers and aspect ratios of the cavity are also appropriately changed to study the effects of these parameters on the flow characteristics. The inclusion of a corner in the L-shaped cavity has been found to result in interesting flow topologies, characterized by the presence of primary, secondary and wall eddies. Current numerical simulations reveal the centreline velocity profiles, flow structure and formation of vortices generated in L-shaped cavities to resemble the flow characteristics observed in deep cavities. © 2020 The Authors
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    Three-dimensional simulations of fluid flows in oscillating lid-driven cavities using lattice Boltzmann method
    (Institute of Physics, 2023) Bhopalam, S.R.; Arumuga Perumal, D.A.; Yadav, A.K.
    We utilize the lattice Boltzmann method to conduct three-dimensional simulations of incompressible flows in oscillating cubic lid-driven cavities. Our investigation focuses on examining the impact of Reynolds number and oscillating frequency on the flow field. Notably, we observe that the flow field can be adequately approximated as two-dimensional within the low and intermediate Reynolds number range, but this approximation is no longer valid for high Reynolds numbers. Additionally, we find that high Reynolds numbers correspond to transient flow fields, while low and moderate Reynolds numbers exhibit quasi-steady periodic flow fields. Our study holds significant relevance for industrial processing applications, where the Reynolds numbers and oscillating frequencies can be optimized to achieve a desired flow field. © 2023 The Japan Society of Fluid Mechanics and IOP Publishing Ltd.