Flow structure mechanism around three rectangular bodies using the Lattice Boltzmann method

Rahman, Hamid; Islam, Shams Ul; Abbasi, Waqas Sarwar; Mukhtar, Safyan; Alam, Tauseef

doi:10.1016/j.oceaneng.2020.108101

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…ey also reported that slight change in unequal spacing ratio caused drastic changes in fluid forces. Rahman et al [18] characterized the flow behind three side-by-side rectangular cylinders into deflected, bistable, flip-flopping, chaotic, symmetric and synchronized flow patterns. Steady, modulated, symmetric, and periodic flow patterns were reported by Rahman et al [19] for flow behind three side-by-side rectangular cylinders for different aspect ratios and Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Computations for Flow Patterns and Force Statistics of Three Rectangular Cylinders

Rahman

Shams-ul-Islam

Abbasi

et al. 2021

Mathematical Problems in Engineering

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In this work, numerical simulations are performed in order to study the effects of aspect ratio (AR) and Reynolds number (Re) on flow characteristics of three side-by-side rectangular cylinders for fixed spacing ratio ( g ), using the lattice Boltzmann method (LBM). The Reynolds number varies within the range 60 ≤ Re ≤ 180, aspect ratio is between 0.25 and 4, and spacing ratio is fixed at g = 1.5. The flow structure mechanism behind the cylinders is analyzed in terms of vorticity contour visualization, time-trace analysis of drag and lift coefficients, power spectrum analysis of lift coefficient and variations of mean drag coefficient, and Strouhal number. For different combinations of AR and Re, the flow is characterized into regular, irregular, and symmetric vortex shedding. In regular and symmetric vortex shedding the drag and lift coefficients vary smoothly while reverse trend occurs in irregular vortex shedding. At small AR, each cylinder experiences higher magnitude drag force as compared to intermediate and large aspect ratios. The vortex shedding frequency was found to be smaller at smaller AR and increased with increment in AR.

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Section: Introductionmentioning

confidence: 99%