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Research Papers: Fluid-Structure Interaction

# The Spanwise Dependence of Vortex-Shedding From Yawed Circular Cylinders

[+] Author and Article Information
James D. Hogan

Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canadav3679@unb.ca

Joseph W. Hall1

Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canadajwhall@unb.ca

1

Corresponding author.

J. Pressure Vessel Technol 132(3), 031301 (May 05, 2010) (5 pages) doi:10.1115/1.4000732 History: Received September 30, 2009; Revised November 18, 2009; Published May 05, 2010; Online May 05, 2010

## Abstract

Simultaneous measurements of the fluctuating wall pressure along the cylinder span were used to examine the spanwise characteristics of the vortex-shedding for yaw angles varying from $α=60 deg$ to $α=90 deg$. The Reynolds number based on the diameter of the cylinder was 56,100. The results indicate that yawing the cylinder to the mean flow direction causes the vortex-shedding in the wake to become more disorderly. This disorder is initiated at the upstream end of the cylinder and results in a rapid decrease in correlation length, from $3.3D$ for $α=90 deg$ to $1.1D$ for $α=60 deg$. The commonly used independence principle was shown to predict the vortex-shedding frequency reasonably well along the entire cylinder span for $α>70 deg$, but did not work as well for $α=60 deg$.

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## Figures

Figure 1

Schematic of a yawed cylinder system

Figure 2

Comparison of power spectra normalized by the dynamic pressure squared along the cylinder span for: (a) α=90 deg, (b) α=70 deg, and (c) α=60 deg

Figure 3

Spanwise variation in the two-point correlation coefficients ρ(y,y′,0) for ◻ (α=90 deg), × (α=80 deg), ▽ (α=70 deg), and * (α=60 deg)

Figure 4

Variation in the correlation length with the yaw angle

Figure 5

Spanwise coherence coefficients at the vortex-shedding frequency for ◻ (α=90 deg), × (α=80 deg), ▽ (α=70 deg), and * (α=60 deg)

Figure 6

Instantaneous spanwise distribution of the fluctuating surface pressure for: (a) α=90 deg, (b) α=80 deg, and (c) α=60 deg

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