Fluid forces on two circular cylinders in crossflow

Jendrzejczyk, J.A.; Chen, Shoei‐Sheng

doi:10.2172/5530805

Cited by 13 publications

(13 citation statements)

References 7 publications

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“…9.4 as a function of pitch-to-diameter ratio. Similar results have been obtained by Bearman and Wadcock (1973) and Jendrzejczyk and Chen (1982). For The steady lift and drag coefficients, compiled by Zdravkovich (1977), are shown in Fig.…”

Section: Flow Regimessupporting

confidence: 83%

Flow-Induced Vibration of Circular Cylindrical Structures

Chen

1985

159

203

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A major purpose of the Technical Information Center is to provide the broadest dissemination possible of information contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments.Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the research discussed herein. ANL-85-51 ------------------------------ 11-6References--Sec. Current DOE funding for this work is from the Office of Reactor Systems, Development and Technology within the Office of Nuclear Energy.A significant amount of material presented in this report is taken from the results of various program activities sponsored by AEC, ERDA, and DOE at ANL.The author is indebted to those who supported the program at ANL throughout the years, in particular, Messrs. Nicholas Grossman and Chet Bigelow for their interest and recognition of this important and challenging subject.The author is grateful for the support received from his colleagues of the Vibration Analysis Section of the Components Technology Division of ANL, which provides the resources necessary to perform this work.The Section Manager, Dr. M. W. Wambsganss, with his unfaltering faith in me, gave me encouragement and confidence to complete this report.Grateful appreciation is expressed to Miss Joyce Stephens for her superb typing and word-processing and to Mrs. S. K. Zussman for her expert editing of the manuscript. 28 CREDITSThe author and Argonne National Laboratory gratefully acknowledge the courtesy of the organizations aLid individuals who granted permission to use illustrations and. other information in this report.The sources of this information are listed below. Figs. 6.3, 6.4 This report summarizes the flow-induced vibration of circular cylinders in quiescent fluid, axial flow, and crossf low, and applications of the analytical methods and experimental data in design evaluation of various system components consisting of circular cylinders.

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Section: Flow Regimessupporting

confidence: 83%

Flow-Induced Vibration of Circular Cylindrical Structures

Chen

1985

159

203

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“…However, Alam, Moriya & Sakamoto (2003a) observed that this sum was higher at T /d < 1.15 and 2.1-5.0 and only lower for T /d = 1.15-2.1 than 2C D0 . Previous investigators (Hori 1959;Bearman & Wadcock 1973;Zdravkovich & Pridden 1977;Jendrzejczyk & Chen 1982;Zhou et al 2001) noted that C L on two side-by-side cylinders was always repulsive and decreased with increasing T /d. Alam, Sakamoto & Moriya (2003b) measured attractive C L at very small T /d, i.e.…”

Section: Introductionmentioning

confidence: 93%

The wake of two side-by-side square cylinders

2011

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Aerodynamic interference between two cylinders involves most of the generic flow features associated with multiple structures, thus providing an excellent model for gaining physical insight into the wake of multiple cylindrical structures. This work aims to provide an experimental systematic study of the flow behind two side-by-side square cylinders. The square cylinder is a representative model for bluff bodies with sharp corners, characterized by a fixed flow separation point, which are distinct from those of continuous curvature with oscillating separation points, typically represented by the circular cylinder. Experiments were performed at a Reynolds number Re of 4.7 × 10 4 and a cylinder centre-to-centre spacing ratio T /d (d is the cylinder height) of 1.02-6.00. The flow was measured using different techniques, including hot wires, load cell, particle imaging velocimetry and laser-induced fluorescence flow visualization. Four distinct flow regimes and their corresponding T /d ranges are identified for the first time on the basis of the flow structure and the Strouhal number. Physical aspects in each regime, such as interference between shear layers, gap flow deflection and changeover, multiple flow modes, entrainment, recirculation bubble, vortex interactions and formation lengths, are investigated in detail and are connected to the characteristics of the time-averaged and fluctuating fluid forces. The flow displays a marked difference in many facets from that behind two side-by-side circular cylinders, which is linked to their distinct flow separation natures. A crucial role played by the gap flow and its passage geometry in contributing to the observed difference is also unveiled.

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“…These measurements are acquired for different arrangements of the cylinders, as the pitch ratio(s), incidence angle and -Aode et al (1985) 100, 300, 1 Â 10 3 1.5-10 30 2 Not given Towing tank FV, CTA St Igarashi (1981) 8.7 Â 10 3 -5.2 Â 10 4 1-5 4 6 0.6 Wind tunnel FV, CTA, pressure St, C P , C P 0 , C D Igarashi (1984) 1.15 Â 10 4 -1.03 Â 10 5 1-1.5 3 13 0.6 Wind tunnel FV, CTA, pressure St, C P , C P 0 , C D Ishigai et al (1972Ishigai et al ( , 1973 1.5 Â 10 3 -1.5 Â 10 4 1-5 11 9 Not given Wind tunnel FV, CTA, pressure St, C P Jendrzejcyk and Chen (1986) 1.5 Â 10 4 -1.5 Â 10 5 1.4-10 12 9 1-11 Water tunnel Force St, C D 0 , C L 0 Kiya et al (1992) 2 Â 10 4 -3.7 Â 10 4 2.5-4 11 10 0.1-10 Wind tunnel CTA, pressure - Kostic and Oka (1972) 1.3 Â 10 4 -4 Â 10 4 1.6-9 5 20 2.8 Wind tunnel Pressure, temperature C P , C D , Nu Kwon et al (1996) 1.7 Â 10 4 1-5 11 2 2.5 Water channel PIV Velocity field Lee and Basu (1997) 2.4 Â 10 4 -5. Nishimura et al (1986) 800-1 Â 10 4 1.2-7.2 5 9 0.6 Water tunnel FV Sh Okajima (1979) 4 Â 10 4 -6.2 Â 10 5 1.…”

Section: Approaches To Understanding the Fluid Behaviourmentioning

confidence: 99%

“…For instance, an increase in freestream turbulence intensity is associated with a reduction in (L/D) c (Ljungkrona et al, 1991). Elevated turbulence intensity also has pronounced effects on the fluid forces, vortex shedding frequencies, and flow regimes (e.g., Jendrzejcyk and Chen (1986), Ljungkrona et al (1991), Zhang and Melbourne (1992), Gu et al (1993)). …”

Section: Tandem Configurationmentioning

confidence: 99%