TY - JOUR

T1 - The wake and thrust by four side-by-side cylinders at a low Re

AU - Sarkar, Md. Mahbub Alam

AU - Zheng, Qinmin

AU - Hourigan, Kerry

PY - 2017/4/1

Y1 - 2017/4/1

N2 - The flow around four identical side-by-side circular cylinders placed normal to the oncoming flow is numerically simulated using the finite volume method (FVM) at a low Reynolds number of 100 based on cylinder diameter D and freestream velocity. How the wake structure, forces, and vortex shedding patterns are contingent on the spacing ratio g* (=g/D, where g is the gap spacing between the cylinders) is studied systemically when g* varies from 0.0 to 2.0. Based on the intrinsic features of the flow, four distinct flow regimes are identified in the range of g* examined. The total time-averaged drag force acting on the four cylinders escalates exponentially with a decrease in g*, as does the lift force, repulsive, on the outer cylinders. The lift forces of the inner cylinders are also repulsive but very weakly sensitive to g*. The Strouhal number is identical for each of the four cylinders in single body flow, different for the outer and inner cylinders in flip-flopping and quasi-interlocked flows, and again identical for interlocked flow.

AB - The flow around four identical side-by-side circular cylinders placed normal to the oncoming flow is numerically simulated using the finite volume method (FVM) at a low Reynolds number of 100 based on cylinder diameter D and freestream velocity. How the wake structure, forces, and vortex shedding patterns are contingent on the spacing ratio g* (=g/D, where g is the gap spacing between the cylinders) is studied systemically when g* varies from 0.0 to 2.0. Based on the intrinsic features of the flow, four distinct flow regimes are identified in the range of g* examined. The total time-averaged drag force acting on the four cylinders escalates exponentially with a decrease in g*, as does the lift force, repulsive, on the outer cylinders. The lift forces of the inner cylinders are also repulsive but very weakly sensitive to g*. The Strouhal number is identical for each of the four cylinders in single body flow, different for the outer and inner cylinders in flip-flopping and quasi-interlocked flows, and again identical for interlocked flow.

KW - Forces

KW - Four cylinders

KW - Side-by-side

KW - Wake

UR - http://www.scopus.com/inward/record.url?scp=85011588869&partnerID=8YFLogxK

U2 - 10.1016/j.jfluidstructs.2017.01.014

DO - 10.1016/j.jfluidstructs.2017.01.014

M3 - Article

AN - SCOPUS:85011588869

VL - 70

SP - 131

EP - 144

JO - Journal of Fluids and Structures

JF - Journal of Fluids and Structures

SN - 0889-9746

ER -