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Wind and Structures Volume 29, Number 1, July 2019 , pages 1-13 DOI: https://doi.org/10.12989/was.2019.29.1.001 |
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Forces and flow around three side-by-side square cylinders |
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Qinmin Zheng, Md. Mahbub Alam, S. Rehman and D.K. Maiti
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| Abstract | ||
| A numerical investigation on forces and flow around three square cylinders in side-by-side arrangement is conducted at a Reynolds number Re = 150 with the cylinder center-to-center spacing ratio L/W = 1.1 ~ 9.0, where W is the cylinder side width. The flow at this Re is assumed to be two-dimensional, incompressible, and Newtonian. The flow simulation is conducted by using ANSYS-Fluent. The flow around the three side-by-side cylinders entails some novel flow physics, involving the interaction between the gap and free-stream side flows as well as that between the two gap flows. An increase in L/W from 1.1 to 9.0 leads to five distinct flow regimes, viz., base-bleed flow (L/W < 1.4), flip-flopping flow (1.4 < L/W < 2.1), symmetrically biased beat flow (2.1 < L/W < 2.6), non-biased beat flow (2.6 < L/W < 7.25) and weak interaction flow (7.25 < L/W < 9.0). The gap flow behaviors, time-averaged and fluctuating fluid forces, time-averaged pressure, recirculation bubble, formation length, and wake width in each flow regime are discussed in detail. | ||
| Key Words | ||
| flow; forces; wake; three cylinders; gap flow | ||
| Address | ||
| Qinmin Zheng and Md. Mahbub Alam:Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology, Shenzhen, China S. Rehman: Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia D.K. Maiti: Department of Applied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Midnapur-721102, WB, India | ||