Vortex shedding from tandem cylinders

Alam, Md. Mahbub; Elhimer, Mehdi; Wang, Longjun; Jacono, David Lo; Wong, Chi-Yin

doi:10.1007/s00348-018-2501-8

Cited by 63 publications

(24 citation statements)

References 41 publications

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“…For subcritical Reynolds numbers, these phenomena can be explained by the existence of different modes or states of the flow topology and vortex shedding. (Zdravkovich 1987) and (Alam et al 2018) characterized the different states as follows: there are three basic types of the flow structure possible, namely "extended-body regime", "reattachment regime" and "co-shedding regime". In the first regime, i.e.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the steady and unsteady forces acting on a pair of circular cylinders in crossflow up to ultra-high Reynolds numbers

2021

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Measurements of the steady and unsteady forces acting on a pair of circular cylinders in crossflow are performed from subcritical up to ultra-high Reynolds numbers. The two cylinders with equal diameters d are arranged inline at two centre-to-centre distances: S/d = 2.8 and 4. The trend of the drag curve for the upstream cylinder $$Cd_{1}$$ C d 1 (Re) at both distances is similar to that for a single circular cylinder. The development of the drag curves $$Cd_{2}$$ C d 2 (Re, S/d = 2.8, 4) of the downstream cylinder is inverse to that of the upstream cylinder. For both cylinder spacing values, the drag on the downstream cylinder is negative for subcritical Reynolds numbers, increases abruptly to positive values at the beginning of the supercritical regime, and shows a significant dip at transcritical Reynolds numbers. This drag inversion indicates that the critical distance Sc decreases sharply in the supercritical Reynolds number range. For S/d = 2.8 at Re$$\rightarrow$$ → 10$$^{7}$$ 7 , the downstream cylinder experiences once more a thrust force. The curve of the Strouhal number St(Re) of the downstream cylinder for S/d = 4 is very close to that of a single cylinder. For Reynolds numbers of Re$$\approx$$ ≈ 1$$\times$$ × 10$$^{6}$$ 6 - 7$$\times$$ × 10$$^{6}$$ 6 , the Strouhal numbers have nearly equal values of St$$\approx$$ ≈ 0.22 - 0.24 for both distances. This is followed by a branching. For Re$$\rightarrow$$ → 10$$^{7}$$ 7 and the case S/d = 2.8, the Strouhal numbers dip at St = 0.17. However, for S/d = 4, they increase up to St = 0.27. In the supercritical range, two peaks occur in the power spectra for the large distance S/d = 4. Based on a wavelet analysis, we can conclude that the low-frequency mode, which does not occur for a single cylinder, is an interference effect. Graphic abstract

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Section: Introductionmentioning

confidence: 99%

Investigation of the steady and unsteady forces acting on a pair of circular cylinders in crossflow up to ultra-high Reynolds numbers

2021

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“…In this case the negative C p is also observed in the region of near the upstream wall of the first building, however closer to the left corner. The further increase in AOA would lead to the situation when both objects are located side by side with respect to the flow, and such situation well were described in number of previous works [55][56][57]. It can be concluded that the flow pattern varies drastically as the angle of inflow increase, which must consequently affect the pressure loads of objects.…”

Section: Numerical Results Of Pressure Loads On Buildings In Tandem Amentioning

confidence: 54%

Wind-induced pressure loads on buildings in tandem arrangement in urban environment

Gnatowska

2018

Environ Fluid Mech

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The wind-induced pressure loads are affected by a broad spectrum of elements involving flow conditions, buildings geometry, or neighbourhoods. Computational fluid dynamics is a useful device used to estimate pressure distribution. The aim of this research is a detailed assessment of the use of numerical calculation (RANS) for forecasting wind-induced pressure loads on buildings arranged in tandem located in the built-up area. The approach of this work was to determine the pressure loads on the walls of rectangular objects, which were the simplified models of buildings located in the ground-level zone. The important task was to estimate the impact of distance between obstacles on the pressure loads on their surfaces. It was found that when changing the distance between buildings the pressure distribution on the downstream object varies significantly. Additionally, for defined geometrical parameters, the influence of inflow angle was analysed. The obtained results demonstrate and confirm that RANS numerical calculations, in spite of all their limits, can accurately modeling the pressure distribution on buildings.

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“…Whereas a large amount of studies have been performed in the past regarding the fluid-dynamic behaviour of two 2D (i.e. "infinite") smooth circular cylinders (Zdravkovich, 1977;Okajima, 1979;Igarashi, 1981;Pearcy et al, 1982;Arie et al, 1983;Igarashi, 1984;Zdravkovich, 1985Zdravkovich, , 1987Meneghini et al, 2001;Alam et al, 2003;Zhou and Yiu, 2006;Alam and Zhou, 2007;Carmo et al, 2010;Sumner, 2010;Alam and Meyer, 2011;Alam, 2014;Griffith et al, 2017;Alam et al, 2018;Schewe and Jacobs, 2019;Hosseini et al, 2021;Schewe et al, 2021) or sharp-edged prisms with square cross sections (Reinholds et al, 1977;Shiraishi et al, 1986;Kareem, 1987;Sakamoto et al, 1987;Sakamoto and Haniu, 1988;Luo, 1989;Luo and Teng, 1990;Ohya et al, 1989;Luo and Teng, 1990;Takeuchi and Matsumoto, 1992;Tatsutani et al, 1993;Hangan and Vickery, 1999;Luo et al, 1999;Alam et al, 2002;Liu and Chen, 2002;Kim et al, 2008;Yen et al, 2008;Sohankar and Etminan, 2009;Etminan et al, 2011;…”

Section: Two Square-section Prisms With Finite Edge Roundness Arrange...mentioning

confidence: 99%

Two identical tandem square prisms with rounded edges and hard marine fouling at incidence in cross-flow: Effect of spacing and Reynolds number on unsteady fluid dynamics

Hinsberg

2022

Ocean Engineering

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Vortex shedding from tandem cylinders

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. and St is discussed based on shear-layer velocity, approaching velocity, vortex formation length, and wake width.

Cited by 63 publications

References 41 publications

Investigation of the steady and unsteady forces acting on a pair of circular cylinders in crossflow up to ultra-high Reynolds numbers

Investigation of the steady and unsteady forces acting on a pair of circular cylinders in crossflow up to ultra-high Reynolds numbers

Wind-induced pressure loads on buildings in tandem arrangement in urban environment

Two identical tandem square prisms with rounded edges and hard marine fouling at incidence in cross-flow: Effect of spacing and Reynolds number on unsteady fluid dynamics

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