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Fundamental Issues and Canonical Flows

Characteristics of Turbulent Wakes Generated by Twin Parallel Cylinders

[+] Author and Article Information
T. N. Aboul Fetouh

Department of Mechanical Engineering, Faculty of Engineering,
Ain Shams University,
1 El Sarayat Street, Abbassia,
Cairo 111517, Egypt

L. A. El-Gabry

Mechanical Engineering Department,
The American University in Cairo,
New Cairo 11835, Egypt
e-mail: lelgabry@aucegypt.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received May 17, 2011; final manuscript received October 15, 2012; published online November 20, 2012. Assoc. Editor: Sharath S. Girimaji.

J. Fluids Eng 134(12), 121201 (Nov 20, 2012) (10 pages) doi:10.1115/1.4007889 History: Received May 17, 2011; Revised October 15, 2012

This research aims to study the characteristics of the wake generated by twin cylinders. The cylinders are arranged in parallel side-by-side and staggered arrangements. The mainstream velocity is varied between 18 m/s and 20 m/s, which are equivalent to cylinder Reynolds numbers between 4750 and 5300. The cross-stream spacing ratios are 2, 3, 4, and 6 times the cylinder's diameter for the side-by-side arrangements. For the staggered arrangement, the cross-stream and streamwise spacing were varied between 2 and 4 times the cylinder diameter. The results show that the spacing ratio s/d has a significant effect on the wake development and interactions. The wakes of the side-by-side cylinders tend to merge into a single wake for cross-stream spacing of 2d and 3d at early stations, equivalent to 15 and 30 times the cylinder diameter, respectively, and merge completely at 50 and 100 times the cylinder diameter for 4d and 6d, respectively. Velocity measurements are used to develop a correlation that relates the wake merging distance to the cylinder spacing. Turbulence measurements are used to develop a correlation between the turbulence intensity and the streamwise distance. The comprehensive survey of the results and the correlations developed are provided in order to facilitate numerical model development and evaluation.

Copyright © 2012 by ASME
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Figures

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Fig. 1

Classification of interference regions [6]

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Fig. 2

Wind tunnel apparatus [26]

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Fig. 3

Flow geometry: the side-by-side arrangement (top), and the staggered arrangement (bottom)

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Fig. 4

Flow characteristics for the side-by-side arrangement

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Fig. 5

Mean velocity profiles for side-by-side cylinders at x/d = 10

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Fig. 6

Mean velocity profiles for side-by-side cylinders at x/ d = 20

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Fig. 7

Mean velocity profiles for side-by-side cylinders at x/ d = 30

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Fig. 8

Mean velocity profiles for side-by-side cylinders at x/ d = 50

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Fig. 9

Streamwise variation of the wake half width for the side-by-side cylinders

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Fig. 10

Streamwise variation of the wake half width for the side-by-side cylinders

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Fig. 11

Streamwise variation of the wake centerline velocity for the side-by-side cylinders

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Fig. 12

Correlation between the merging distance and the spacing ratio for the side-by-side cylinders

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Fig. 13

Turbulence intensity profiles for side-by-side cylinders at x/d = 10

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Fig. 14

Turbulence intensity profiles for side-by-side cylinders at x/d = 20

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Fig. 15

Turbulence intensity profiles for side-by-side cylinders at x/d = 30

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Fig. 16

Turbulence intensity profiles for side-by-side cylinders at x/d = 50

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Fig. 17

Streamwise variation of the maximum turbulence intensity for side-by-side cylinders

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Fig. 18

Mean velocity profiles, staggered cylinders, s/d = 2, L/ d = 2 and 4, x/d = 10

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Fig. 19

Mean velocity profiles, staggered cylinders, s/d = 2, L/ d = 2 and 4, x/d = 20

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Fig. 20

Mean velocity profiles, staggered cylinders, s/d = 2, L/ d = 2 and 4, x/d = 30

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Fig. 21

Mean velocity profiles, staggered cylinders, s/d = 2, L/ d = 2 and 4, x/d = 50

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Fig. 22

Mean velocity profiles, staggered cylinders, s/d = 4, L/ d = 2 and 4, x/d = 10

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Fig. 23

Mean velocity profiles, staggered cylinders, s/d = 4, L/ d = 2 and 4, x/d = 20

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Fig. 24

Mean velocity profiles, staggered cylinders, s/d = 4, L/ d = 2 and 4, x/d = 30

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Fig. 25

Mean velocity profiles, staggered cylinders, s/d = 4, L/ d = 2 and 4, x/d = 50

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Fig. 26

Streamwise variation of the wake half width for the staggered cylinders

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Fig. 27

Variation of the half width for the staggered cylinders

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Fig. 28

Streamwise variation of the center-plane velocity for the staggered cylinders

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Fig. 29

Turbulence intensity profiles for staggered cylinders for s/d = 2 at x/d = 10

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Fig. 30

Turbulence intensity profiles for staggered cylinders for s/d = 2 at x/d = 20

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Fig. 31

Turbulence intensity profiles for staggered cylinders for s/d = 2 at x/d = 30

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Fig. 32

Turbulence intensity profiles for staggered cylinders for s/d = 2 at x/d = 50

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Fig. 33

Turbulence intensity profiles for staggered cylinders s/ d = 4 at x/d = 10

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Fig. 34

Turbulence intensity profiles for staggered cylinders s/ d = 4 at x/d = 20

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Fig. 35

Turbulence intensity profiles for staggered cylinders s/ d = 4 at x/d = 30

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Fig. 36

Turbulence intensity profiles for staggered cylinders s/ d = 4 at x/d = 50

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Fig. 37

Streamwise variation of the maximum turbulence intensity for the staggered cylinders

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