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论文类型：期刊论文

发表时间：2014-07-01

发表刊物：JOURNAL OF FLUIDS AND STRUCTURES

收录刊物：SCIE、EI

卷号：48

页面范围：235-259

ISSN号：0889-9746

关键字：Laminar flow; Circular cylinder; Control rods; Fluid forces; Navier-Stokes equations; Finite element method

摘要：Laminar flow past a circular cylinder with multiple small-diameter control rods is numerically investigated in this study. The effects of rod-to-cylinder spacing ratio, rod and cylinder diameter ratio, cylinder Reynolds number, number of control rods and angle of attack on the hydrodynamics of the main circular cylinder are investigated. Four different flow regimes are identified based on the mechanism of lift and drag reduction. The range of rod-to-cylinder spacing ratio where significant force suppression can be achieved is found to become narrower as the Reynolds number increases in the laminar regime, but is insensitive to the diameter ratio. The numerical results for the case with six identical small control rods at Re=200 show that the lift fluctuation on the main cylinder can be suppressed significantly for a large range of spacing ratio and various diameter ratios, while the drag reduction on the main cylinder is also achieved simultaneously. The six-control-rod arrangement has shown better performance in flow control than the arrangements with less control rods, especially in terms of force reduction at various angles of attack. (C) 2014 Elsevier Ltd. All rights reserved.