Three-dimensional study of flow past a square cylinder at low Reynolds numbers

Saha, A.; Biswas, Gautam; Muralidhar, K.

doi:10.1016/s0142-727x(02)00208-4

Cited by 230 publications

(114 citation statements)

References 21 publications

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“…The computer simulations at Re = 200 reported by Sohankar et al [7] showed that St increased gradually from ca 0. as shown by Sohankar et al [8], Saha et al [9], and Luo et al [10]. Such transitions have been extensively explored in wakes of circular cylinders; see e.g.…”

Section: E-mail Address: Hatefkhaledi@ntnuno (Ha Khaledi)mentioning

confidence: 88%

On vortex shedding from a hexagonal cylinder

Khaledi

Andersson

2011

Physics Letters A

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The unsteady wake behind a hexagonal cylinder in cross-flow is investigated numerically. The timedependent three-dimensional Navier-Stokes equations are solved for three different Reynolds numbers Re and for two different cylinder orientations. The topology of the vortex shedding depends on the orientation and the Strouhal frequency is generally higher in the wake of a face-oriented cylinder than behind a corner-oriented cylinder. For both orientations a higher Strouhal number St is observed when Re is increased from 100 to 500 whereas St is unaffected by a further increase up to Re = 1000. The distinct variation of St with the orientation of the hexagonal cylinder relative to the oncoming flow is opposite of earlier findings for square cylinder wakes which exhibited a higher St with corner orientation than with face orientation.

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Section: E-mail Address: Hatefkhaledi@ntnuno (Ha Khaledi)mentioning

confidence: 88%

On vortex shedding from a hexagonal cylinder

Khaledi

Andersson

2011

Physics Letters A

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“…3 and 4, respectively. Some numerical results of Davis and Moore [24], Franke et al [25], Sohankar et al [26], Robichuax et al [27] and Saha et al [28] are also plotted in the figure for comparison. It is seen that the present calculation for the mean drag coefficient at Re = 250 is very close to the experimental data of Shimizu and Tanida [22].…”

Section: Computer Code Validationmentioning

confidence: 99%

Numerical simulation of flow past rectangular cylinders with different aspect ratios using the incompressible lattice Boltzmann method

et al. 2012

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This paper presents a numerical study of a uniform flow past a rectangular cylinder using the incompressible lattice Boltzmann method (ILBM). Firstly, we use the ILBM to simulate the flow past a square cylinder symmetrically placed in a two-dimensional channel and results are validated against the well-resolved results obtained using finite-difference method and finite-volume method. Secondly, the effects of the aspect ratio defined as R = width/height on the fluid forces, vortex shedding frequency and the flow structures in the wake are investigated. Aspect ratios ranging from 0.15 to 4.00 and four Reynolds numbers Re = 100, 150, 200 and 250 are selected for the investigation. The results show that the effects of aspect ratio on physical quantities such as drag and lift coefficients, Strouhal number and the vortex shedding mechanism are very notable in the range between 0 and 2. In general, the drag coefficient decreases with the aspect ratio and the decreasing rate is more distinct in the range of 0.15 ≤ R ≤ 2.0. There is no local maximum found at around R = 0.6 in the drag coefficient as reported for higher Reynolds numbers in the literature. However the root-mean-square value of the lift coefficient shows a maximum value at R ≈ 0.5 for all Reynolds numbers selected. The variation of Strouhal number with R appears to be different for four selected Reynolds numbers. Especially for Re = 250, a discontinuity in St, as has been observed for higher Reynolds numbers, is observed at around R = 1.45 where multiple peaks are found in the result of Fourier spectrum analysis of the lift force and irregular vortex shedding behavior with no fixed shedding frequency is observed from the instantaneous vorticity contours. Such discontinuity is not observed for Re = 100, 150 and 200. The present results using the LBM are compared with some existing experimental data and numerical studies. The comparison shows that the LBM can capture the characteristics of the bluff body flow well and is a useful tool for bluff body flow studies.

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“…This assumption is valid by the fact that the Reynolds number of the current study is lower than the critical Reynolds number for the onset of three-dimensional instability, which is Re = 161 according to the Floquet stability analysis of Robichaux et al [13]. Numerical investigations of Saha et al [14], Blackburn and Lopez [15] and experimental investigations of Luo et al [16,17] also confirmed that the flow over a bluff body became three-dimensional when the Reynolds number was Re > 160 . Additionally, Sohankar et al [18] also agreed that there was no difference between two-and three-dimensional simulations of flow around a single square cylinder at Re = 150 .…”

Section: Flow Simulationsmentioning

confidence: 62%

Aeolian Tones Radiated from Flow Over Bluff Bodies

Ali¹,

Zaki²,

Ismail³

et al. 2013

TOMEJ

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Bluff body is a simple but a central shape for many engineering applications. The geometry shape of the bluff body characterises the behaviour of the flow over the bluff body, where a more complex flow structure is found near downstream. Shear layer separation is mainly responsible for the periodic global phenomena, that includes the generation of sound. The magnitude of the aerodynamically generated sound is dominated by the fluctuations of aerodynamics forces, i.e., drag and lift. The study also shows that the sound pressure field is shaped by the aeolian tones that is related strongly to the lift fluctuations of the bluff body. Amplitude and frequency of the fluctuating lift change naturally with the shape of a particular bluff body. Triangular cylinder exhibits the largest sound pressure level (41.9 dB) followed by ellipse and circular shapes. Square cylinder emits the lowest sound pressure level (36.7 dB). This corresponds to the longest downstream vortex formation length at which for a square cylinder the long vortex formation length provides space for more vortex to dissipate.

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Three-dimensional study of flow past a square cylinder at low Reynolds numbers

Cited by 230 publications

References 21 publications

On vortex shedding from a hexagonal cylinder

On vortex shedding from a hexagonal cylinder

Numerical simulation of flow past rectangular cylinders with different aspect ratios using the incompressible lattice Boltzmann method

Aeolian Tones Radiated from Flow Over Bluff Bodies

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