Suppression of fluid force on flow past a square cylinder with a detached flat plate at low Reynolds number for various spacing ratios

Islam, Shams Ul; Rahman, Hamid; Abbasi, Waqas Sarwar; Noreen, Uzma; Khan, Asad

doi:10.1007/s12206-014-1118-y

Cited by 33 publications

(13 citation statements)

References 14 publications

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“…This comparison will help in control of vortex shedding and reduction of fluid forces acting on cylinders which has been a major concern of many studies. 33,34 The present calculations yield vorticity and streamlines contours visualization for wake structure mechanism, temporal variations of the flow induced forces and dependence of Cdmean and St on the gap spacings. Calculations of the force statistics are quite straight forward.…”

Section: Resultsmentioning

confidence: 90%

Numerical investigation of fluid-solid interaction for flow around three square cylinders

et al. 2018

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In this work, fluid-solid interactions are numerically investigated for flow around three equally/unequally spaced square cylinders using the lattice Boltzmann method. Two major trends of shear layers observed for equal gap spacings between cylinders: (i) without roll up (W), and (ii) with roll up (R). While for unequal gap spacings, four major trends of shear layers observed: (i) without roll up in both gaps (WW), (ii) without rollup in first gap and with roll up in second gap (WR), (iii) with roll up in first gap and without roll up in second gap (RW), and (iv) with roll up in both gaps (RR). g = 3 is found to be the critical equal spacing value. Also g = 1.5 is found to be suitable equal spacing in terms of minimum drag force. While the suitable unequal gap spacing combinations found in this study are (g1, g2) = (1.5, 0.5), (g1, g2) = (3, 0.5) and (g1, g2) = (5, 0.5). Results show that flow induced forces can be suppressed by suitable unequal gap spacing combinations.

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Section: Resultsmentioning

confidence: 90%

Numerical investigation of fluid-solid interaction for flow around three square cylinders

et al. 2018

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“…Recently, the flow control technology has been applied to the flow over bluff bodies, most of the work refers to the passive flow control [12][13][14][15][16][17][18], where the flow is being modified via using static devices, being this the kernel idea of passive flow control. In 1998, Sohankar et al [12] conducted several simulations on the flow around a square cylinder by introducing an adjustable parameter, angle of attack (AOA), ranging from 0 to 45.…”

Section: Passive Flow Control Of the Flow Over A Square Cylindermentioning

confidence: 99%

Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Bergadà

Mellibovsky

et al. 2020

Meccanica

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The present study focuses on the flow over a 2D square cylinder, with a plate placed in front of it. An inhouse code using the lattice Boltzmann method (LBM) was employed for all the simulations presented. Few cases were simulated using the open source code Nektar++, the results obtained from both methodologies were compared. Regarding the plate, three related parameters, velocity ratio, distance between the plate and cylinder, and the thickness of the plate, were studied in order to evaluate the impact of these parameters on the flow behavior. The interactions between these parameters were as well investigated. The POD technology was also employed to predict the flow behavior based on the existing information. It turned out the POD technology is a trustable methodology to mathematically pre-investigate the flow field, therefore it is capable of saving large computational resources. From the present results predicted by the POD technology, it was observed that the number of the existing modes has a crucial impact on the results, the higher the number of modes, the better the predicted results.

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“…They also found that the third cylinder experiences negative drag force either at small gap spacing g = 0.5 or high spacing value g = 5 or 6 depending on Re. The readers can also find the importance of more than one cylinders arranged inline in the papers of Ding et al [26], Inoue et al [27], Lankadasu and Vengadesan [28], Etminan et al [29], Yojina et al [30], Islam et al [31] and Abbasi et al [32]. From the above literature, it is clear that all the researchers concentrate on the effects of Re and g for flow past more than one cylinders.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of different aspect ratios for flow past three inline rectangular cylinders

Islam

Manzoor

Ying

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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In this paper, numerical investigations are carried out to study the effect of aspect ratios (AR = length/height) for flow past three rectangular cylinders aligned inline at different gap spacings (g) using lattice Boltzmann method. The aspect ratio is varied between 0.25 and 3, gap spacing is taken in the range from 0.5 to 7 and the Reynolds number is fixed at 150. With the help of present numerical investigation, it is found that the variation of forces with different AR and g is governed by six distinct flow patterns: (1) shear layer reattachment flow; (2) steady flow; (3) quasi-steady flow; (4) strongly interactive vortex shedding flow; (5) two-row vortex street flow; and (6) critical flow pattern. It is observed that the development of vortices, interferences of the free shear layers and the wake vortices distribution of three cylinders play a vital role in the variation of shedding frequencies and fluid forces. Consequently, the cylinders placed at downstream usually experience serious fluctuating forces due to unsteady wakes generated by the upstream cylinders. Also, the upstream cylinder normally experiences larger mean drag force as compared to the downstream ones. The sudden jumps in mean drag coefficients and Strouhal numbers with their maximum and minimum values are identified, respectively. The upstream and middle cylinders force coefficients strongly affected due to critical aspect ratios at different fixed gap spacings. It is observed that the wake transition at early stages significantly changes by changing the aspect ratios for fixed gap spacings. The results also show that the middle and downstream cylinders experience negative drag force for some aspect ratios and gap spacings. Furthermore, the dependence of the critical gap spacing on the aspect ratios is also discussed.

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Suppression of fluid force on flow past a square cylinder with a detached flat plate at low Reynolds number for various spacing ratios

Cited by 33 publications

References 14 publications

Numerical investigation of fluid-solid interaction for flow around three square cylinders

Numerical investigation of fluid-solid interaction for flow around three square cylinders

Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Numerical investigation of different aspect ratios for flow past three inline rectangular cylinders

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