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Research Papers: Flows in Complex Systems

Energy Concentration by Bluff Bodies—A Particle Image Velocimetry Investigation

[+] Author and Article Information
Eshodarar Manickam Sureshkumar

School of Mechanical Engineering,
The University of Adelaide,
Adelaide SA 5005, Australia
e-mail: eshodarar.manickamsureshkumar@adelaide.edu.au

Maziar Arjomandi

School of Mechanical Engineering,
The University of Adelaide,
Adelaide SA 5005, Australia
e-mail: maziar.arjomandi@adelaide.edu.au

Bassam B. Dally

School of Mechanical Engineering,
The University of Adelaide,
Adelaide SA 5005, Australia
e-mail: bassam.dally@adelaide.edu.au

Benjamin S. Cazzolato

School of Mechanical Engineering,
The University of Adelaide,
Adelaide SA 5005, Australia
e-mail: benjamin.cazzolato@adelaide.edu.au

Mergen H. Ghayesh

School of Mechanical Engineering,
The University of Adelaide,
Adelaide SA 5005, Australia
e-mail: mergen.ghayesh@adelaide.edu.au

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 31, 2018; final manuscript received September 18, 2018; published online December 24, 2018. Assoc. Editor: Hui Hu.

J. Fluids Eng 141(6), 061105 (Dec 24, 2018) (14 pages) Paper No: FE-18-1229; doi: 10.1115/1.4041886 History: Received March 31, 2018; Revised September 18, 2018

Particle image velocimetry (PIV) of four cylinders with different cross sections were performed in a recirculating water channel at Reynolds numbers of 5000 and 10,000. The cylinders were split into two distinct categories; semicircular and convex-edged triangular (c-triangular) prisms which have a smooth diverging fore-face and a flat, backward facing step aft-face, and a trapezoid which has a flat fore face and a backward-facing step aft-face. The resulting streamwise and transverse velocity vectors (u and v, respectively) were analyzed to provide a qualitative comparison of the bluff body wakes to the circular cylinder, which is the standard upstream stationary body in wake-induced vibration (WIV) energy technology. The Reynolds stresses, turbulent kinetic energy (TKE), mean spanwise vorticity, and the energy in the fluctuating component of the wake were compared. The main findings are: (i) a convex fore-face and a backward-facing step aft face are more effective at converting the flow energy to temporal wake energy (+20%) compared to a circular cylinder, (ii) a trapezoid type shape is less effective at converting flow energy to temporal wake energy (−40%) compared to a circular cylinder, (iii) increasing Reynolds number reduces the efficiency of conversion of upstream flow energy to downstream transverse temporal energy. Utilizing stationary upstream bodies such as the semicircle and the c-triangle can result in concentrating more energy in the fluctuating components for the downstream transversely vibrating bluff body in a WIV system, and hence can realize in more efficient WIV technology.

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Figures

Grahic Jump Location
Fig. 1

Bluff body cross-section used in this study (all shapes have a characteristic diameter of 30 mm; not to scale); from left to right—circle (a), semicircle (b), c-triangle (c), and trapezoid (d)

Grahic Jump Location
Fig. 3

Power spectrum output for the fluctuating transverse velocity component (v′) at x/D = 2 and y/D = 0 for the circular (a) and trapezoidal (b) cylinders

Grahic Jump Location
Fig. 4

Power spectrum output for the fluctuating transverse velocity component (v′) at x/D = 2 and y/D = 0 for the semicircular (a) and convex-edged triangular (b), cylinders

Grahic Jump Location
Fig. 5

Normalized mean streamwise velocity, u/¯U0, of the circular cylinder along the centerline (y/D = 0) compared to the published experimental data by Norberg [37]

Grahic Jump Location
Fig. 6

Normalized mean streamwise velocity,u¯/U0 in the wake of a circular cylinder at Re = 10,000 from PIV [39] (a), DNS [39] (b), and current research (c)

Grahic Jump Location
Fig. 7

Mean normalized spanwise vorticity ωz¯D/U0 in the wake of the bluff bodies. Top row of images corresponds to Re = 5000 (ad) and the bottom row (eh) to Re = 10,000. Images from left to right—circle (a and e), semicircle (b and f), trapezoid (c and g), and c-triangle (d and h). All the contours have the same scale.

Grahic Jump Location
Fig. 8

Reynolds stresses in the current research,u′v′/U02. Order of images same as Fig. 7.

Grahic Jump Location
Fig. 9

Turbulent kinetic energy [u′2¯+v′2¯]/U02(TKE) in the wake of the investigated bluff bodies. Order of images same as Fig. 7.

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Fig. 10

Normalized energy magnitudes due to the mean streamwise component (Eu¯). Order of images same as Fig. 7.

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Fig. 11

Normalized energy magnitudes due to the mean transverse component (Ev¯). Order of images same as Fig. 7.

Grahic Jump Location
Fig. 12

Normalized energy magnitudes due to the fluctuating streamwise component (Eufs′). Order of images same as Fig. 7.

Grahic Jump Location
Fig. 2

Working section of the Thebarton water channel (Birdseye view) with a schematic of the PIV setup

Grahic Jump Location
Fig. 13

Normalized energy magnitudes due to the fluctuating transverse component (Evfs′). Order of images same as Fig. 7.

Grahic Jump Location
Fig. 14

Normalized transverse fluctuating energy magnitudes along the centerline (y/D = 0) for all the bluff bodies investigated. The top plot is for Re = 5000 and the bottom plot corresponds to Re = 10,000.

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