Numerical investigation of flow features for two horizontal rectangular polygons

Gul, Farheen; Nazeer, Ghazala; Sana, Madiha; Shigri, Sehrish Hassan; Ul Islam, Shams

doi:10.1063/5.0186721

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…These studies collectively advance the understanding of fluid dynamics, providing valuable insights for applications ranging from traditional fluid mechanics to advanced thermal management and electromagnetic wave propagation systems. Gul et al 34 conducted a numerical investigation to explore the flow features of two horizontal rectangular polygons, providing insights into hydrodynamic behaviors. In a subsequent study, Gul et al 35 conducted an extensive examination of flow characteristics for two vertical rectangular polygons subjected to two-dimensional cross flow conditions, contributing further to the understanding of fluid dynamics around geometric structures.…”

Section: Introductionmentioning

confidence: 99%

Enhancing hydrodynamic forces through miniaturized control of square cylinders using the lattice Boltzmann method

Refaie Ali,

Abbasi,

Younus

et al. 2024

Sci Rep

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This study investigates the influence of small control cylinders on the fluid dynamics around a square cylinder using the Lattice Boltzmann Method (LBM). Varying the gaps (L) between the main and control cylinders from 0 to 6, four distinct flow regimes are identified: the solo body regime (SBR), shear layer reattachment (SLR), suppressed fully developed flow (SFDF), and intermittent shedding (IS). The presence of control cylinders results in significant reductions in flow-induced forces, with drag coefficient (CD) and root mean square values of drag and lift coefficients (CDrms and CLrms) decreasing by approximately 31%, 90%, and 81%, respectively. The SFDF flow regime exhibits the lowest fluid forces compared to other regimes. The effects of tiny control cylinders on the fluid flow characteristics of a square cylinder are examined using the Lattice Boltzmann Method (LBM) in this research work. The gaps (L) between the main and control cylinders are varied in the range from 0 to 6. The size of each control cylinder is equal to one-fifth of the primary cylinder. According to the findings, there are four distinct flow regimes as the gap spacing varies: solo body regime (SBR), shear layer reattachment (SLR), suppressed fully developed flow (SFDF), and intermittent shedding (IS) for gap spacing ranges 0 ≤ L ≤ 0.2, 0.3 ≤ L ≤ 0.9, 1 ≤ L ≤ 3, and 3.2 ≤ L ≤ 6, respectively. Additionally, it has been noted that the amplitude of variable lift force is reduced when the gap separation between the main and control cylinders is increased. When compared to solo cylinder values, it is found that the presence of small control cylinders in the flow field results in a considerable reduction of flow-induced forces. The SFDF flow regime was determined to have the lowest fluid forces compared to the other flow regimes studied. Our findings highlight the efficacy of small control cylinders in mitigating flow-induced forces and controlling flow characteristics. The LBM proves to be a valuable computational technique for such fluid flow problems.

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Section: Introductionmentioning

confidence: 99%

Enhancing hydrodynamic forces through miniaturized control of square cylinders using the lattice Boltzmann method

Refaie Ali,

Abbasi,

Younus

et al. 2024

Sci Rep

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Alignment impact of three unequal-sized square cylinders on the wake flow pattern and fluid forces

Fezai,

Oueslati

2024

Physics of Fluids

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A finite volume method and a full multi-grid technique are implemented to analyze the influence of alignment type of three unequal-sized square cylinders on the characteristics of wake flow pattern and fluid forces of the flow. Three-square cylinders with different dimensions C1, C2, and C3 are arranged for three main combinations, namely, in-line arrangement, side-by-side arrangement, and staggered arrangement. Analysis of flow patterns in different regimes is performed for the different arrangement type and for Reynolds number (Re) varied in range (1, 200). The second parameter is the arrangement type. The wake flow patterns including vortex shedding and the evolution of vortices, and force coefficients are predicted and analyzed for the three unequal-sized square arrangements in terms of streamlines, iso-vortices, and drag (CD) and lift (CL) coefficient evolutions for steady and unsteady regimes. Of great interest is the analysis of the combined effect of the Reynolds number and the adopted arrangements on the bifurcation emergence phenomenon and the CL and CD evolutions profiles while predicting the critical Reynolds number for each configuration. The numerical outcomes demonstrate that Re values and the different three-square cylinders arrangements have a prominent influence on the flow characteristics. The study reveals that the unsteady regime of the flow appears in the side-by-side arrangement at (Rec = 63), in the staggered arrangement (Rec = 76), and finally in the in-line arrangement for the specific value (Rec = 146). Furthermore, the effect of different arrangements on time averaged drag and lift is explored and discussed. It is found that the in-line alignment causes a strong reduction in drag values, while highest values are obtained for the side-by-side combination.

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Numerical investigation of flow features for two horizontal rectangular polygons

Cited by 2 publications

References 32 publications

Enhancing hydrodynamic forces through miniaturized control of square cylinders using the lattice Boltzmann method

Enhancing hydrodynamic forces through miniaturized control of square cylinders using the lattice Boltzmann method

Alignment impact of three unequal-sized square cylinders on the wake flow pattern and fluid forces

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