Aerodynamic characteristics and wake formation behind a pair of side-by-side rectangular cylinders using the lattice Boltzmann method

Rahman, Hamid; Khan, Israr Ahmad; Abbasi, Waqas Sarwar; Islam, Shams Ul

doi:10.1016/j.oceaneng.2024.117813

Ocean Engineering

2024

DOI: 10.1016/j.oceaneng.2024.117813

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Aerodynamic characteristics and wake formation behind a pair of side-by-side rectangular cylinders using the lattice Boltzmann method

Hamid Rahman,

Israr Ahmad Khan,

Waqas Sarwar Abbasi

et al.

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2024

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Cited by 2 publications

References 33 publications

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Interference effects on wakes of a cluster of pentad square cylinders in a crossflow: A lattice Boltzmann study

Ghayoor,

Abbasi,

Majeed

et al. 2024

AIP Advances

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This study examines the variations in wake structures and fluid forces around a cluster of five square cylinders. The cylinders in the cluster are arranged such that a larger cylinder (the main cylinder) is surrounded by four similar but small-sized cylinders, which are very common in marine risers and axial pipe shrouds. The analysis uses an in-house developed code based on the lattice Boltzmann method. The gap spacing (g*) between the main and the surrounding cylinders varies from 0 to 10 while maintaining a fixed Reynolds number (Re) of 200. The accuracy and consistency of the code are first tested through simulations that examine the flow behind a single cylinder, revealing strong concurrence with the existing data. In the next step, the flow characteristics of the pentad arrangement are analyzed. Five diverse flow modes, including the extended single bluff body flow, stable symmetric flow, chaotic irregular shedding, antiphase symmetric flow, and modulated periodic flow, are observed depending on the gap distances. It is found that the small cylinders in the downstream position from the primary cylinder experience a negative mean drag at narrow gaps. In contrast, those at the upstream position are subjected to a positive drag force regardless of the gap spacing. The main cylinder has a higher drag coefficient compared to other cylinders for all gap spacing cases. The shedding frequencies appear similar for upstream and downstream smaller-size cylinders at higher spacing values, while the shedding frequencies for the main cylinder significantly deviate from the surrounding small cylinders.

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Interference effects on wakes of a cluster of pentad square cylinders in a crossflow: A lattice Boltzmann study

Ghayoor,

Abbasi,

Majeed

et al. 2024

AIP Advances

View full text Add to dashboard Cite

show abstract

Numerical simulation of vortex-induced vibration in a bladeless turbine: Effects of separation distance between tandem harvesters

Graciano,

Sierra-Espinosa,

García

2024

MINA

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<p>Bladeless wind turbines are attracting attention as energy harvesters due to several conveniences like the ease of construction and suitability for operating under small wind speed. As a grouped energy generation system, it is likely the simplest configuration compared to wind farms. However, the characterization of tandem harvesters requires a deep understanding of the effects produced by the interaction of the two. Therefore, this work considered a set of two conical cylinders representing tandem harvesters, which lie on the bottom of a wind tunnel and were subjected to resonance conditions. The attention focused on evaluating the effects of separation distance between conical cylinders by three distances: $\ell$ = 0.25<italic>h</italic>, 0.5<italic>h,</italic> and 0.75<italic>h</italic>, where <italic>h</italic> is the cylinder's total height. Oscillation due to vortex shedding was numerically predicted. The analysis centered on the fluid-structure interaction in pairs of wind generators subjected to wind-induced resonance, and how the distance between them affects their oscillation. Experimental data of cylinder vibration measured in a wind tunnel served to validate the numerical results. The results showed strong effects of the wake on the second cylinder placed downstream from the first one for a distance $\ell$ = 0.25<italic>h</italic>. In contrast, minimum effects were observed for ℓ = 0.5<italic>h</italic> and ℓ = 0.75<italic>h</italic>.</p>

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Aerodynamic characteristics and wake formation behind a pair of side-by-side rectangular cylinders using the lattice Boltzmann method

Cited by 2 publications

References 33 publications

Interference effects on wakes of a cluster of pentad square cylinders in a crossflow: A lattice Boltzmann study

Interference effects on wakes of a cluster of pentad square cylinders in a crossflow: A lattice Boltzmann study

Numerical simulation of vortex-induced vibration in a bladeless turbine: Effects of separation distance between tandem harvesters

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