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http://dx.doi.org/10.12989/was.2019.29.1.001

Forces and flow around three side-by-side square cylinders  

Zheng, Qinmin (Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology)
Alam, Md. Mahbub (Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology)
Rehman, S. (Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals)
Maiti, D.K. (Department of Applied Mathematics with Oceanology and Computer Programming Vidyasagar University)
Publication Information
Wind and Structures / v.29, no.1, 2019 , pp. 1-13 More about this Journal
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 flowat 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.
Keywords
flow; forces; wake; three cylinders; gap flow;
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