Flow around four cylinders arranged in a square configuration

Wang, Xikun; Gong, Kai; Liu, Hang; Zhang, J.-X.; Tan, Soon Keat

doi:10.1016/j.jfluidstructs.2013.08.011

Cited by 55 publications

(23 citation statements)

References 35 publications

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“…The interactions between individual wakes of multiple obstacles, for di erent orientations and spacings were investigated in detail by Wang et al (2013) and references therein, therefore the case C 7 is not further discussed in the present paper.…”

Section: Velocity Measurementsmentioning

confidence: 99%

Characterisation of drag and wake properties of canopy patches immersed in turbulent boundary layers

2016

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The wakes and the drag forces of canopy patches with di erent densities, immersed in turbulent boundary layers, are investigated experimentally. The patches are circular (with outer diameter D) and are made of several identical circular cylinders (height, H and diameter, d). The bulk aspect ratio of all the patches (AR = H D) was xed at 1 and the patch density (φ = Ncd 2 D 2 , also referred to as solidity) is altered by varying the number of cylinders (Nc) in the patch. Drag measurements show that the patch drag coe cient increases with increasing density. However, the drag coe cient of the highest investigated density (φ ≈ 0.25) is greater than the drag coe cient of a solid patch (i.e. φ = 1, which is a solid cylinder with AR = 1). PIV measurements were carried out along streamwise-wall-normal (x − y) plane along the centreline of patch and in the streamwise-spanwise (x − z) plane at its mid height (i.e. y = H 2). Mean velocity elds show that the porosity of the patch promotes bleeding along all directions. It was observed that bleeding along the vertical/horizontal direction increases/decreases with increasing φ. Furthermore, it was also observed that bleeding along the lateral direction dictates the point of ow separation along the sides of the patch and makes it independent of φ. All these aspects make wakes for porous patches markedly di erent from their solid counterpart and provide a rational basis to explain the observed trends in the drag coe cient.

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Section: Velocity Measurementsmentioning

confidence: 99%

Characterisation of drag and wake properties of canopy patches immersed in turbulent boundary layers

2016

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“…The PIV technique was also used in some experimental studies of flow past four cylinders to identify the wake flow features. [34][35][36][37] It was found that the wake flow for four cylinders in an inline square arrangement can be generally classified into following three regimes: the shielding regime for spacing ratio less than 2, the shear layer reattachment regime for spacing ratios between 2.5 and 3.5, and the vortex impinging regime for spacing ratios greater than 4.…”

Section: Introductionmentioning

confidence: 99%

Vortex-induced vibration of four cylinders in an in-line square configuration

et al. 2016

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“…Based on the experimental study, Zdravkovich (1985) concluded that the coupling between cylinders disappeared when the transverse pitch ratio was above 4, and the wake interference gradually diminished when the longitudinal pitch ratio was greater than 7. Wang et al (2013) conducted an experimental study of flow around four circular cylinders in a square configuration and reconfirmed that depending on the pitch ratio, the inline flow can be broadly classified as shielding regime, shear layer reattachment regime and vortex impinging regime. It was observed that for transverse spacing ratios above 4, the four cylinder array could be regarded as two isolated parallel rows of two cylinders in tandem.…”

Section: Introductionmentioning

confidence: 91%

Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes

2019

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A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing

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Flow around four cylinders arranged in a square configuration

Cited by 55 publications

References 35 publications

Characterisation of drag and wake properties of canopy patches immersed in turbulent boundary layers

Characterisation of drag and wake properties of canopy patches immersed in turbulent boundary layers

Vortex-induced vibration of four cylinders in an in-line square configuration

Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes

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