Hydrodynamic coefficients of two fixed circular cylinders fitted with helical strakes at various staggered and tandem arrangements

Shan Huang, Andy Sworn

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Experimental results are presented in the paper of two identical stationary cylinders fitted with triple-starting helical strakes subjected to steady uniform cross flows in a flume. The two cylinders were placed at various staggered and tandem positions. In total, 32 relative positions were tested with the streamwise spacing varied 2 to 15 diameters and the transverse spacing from 0 to 7.5 diameters. The hydrodynamic loading was measured in both the in-line and the cross-flow directions for each cylinder. The nominal Reynolds number, based on the cylinder diameter, ranged from 1.40 ×10 4 to 4.21 ×10 4 . It is found that, as expected, the straked cylinder has a higher drag coefficient in comparison with its smooth counterpart. Qualitatively, the interaction between the two straked cylinders is similar to that between two smooth cylinders in terms of the mean hydrodynamic coefficients. It is further found that whilst the strakes reduce the fluctuating forces on the upstream cylinder, the reduction is significantly smaller for the down-stream straked cylinder.
LanguageEnglish
Pages21-26
Number of pages6
JournalApplied Ocean Research
Volume43
Issue numberOctober
Early online date10 Aug 2013
DOIs
Publication statusPublished - Oct 2013

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Circular cylinders
Hydrodynamics
Drag coefficient
Reynolds number

Keywords

  • strakes circular cylinder vortex-induced vibration (VIV) cylinder interference
  • hydrodynamic coefficients
  • two fixed circular cylinders
  • helical strakes
  • tandem arrangements
  • vortex-induced vibration (VIV)
  • cylinder interference
  • circular cylinder

Cite this

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title = "Hydrodynamic coefficients of two fixed circular cylinders fitted with helical strakes at various staggered and tandem arrangements",
abstract = "Experimental results are presented in the paper of two identical stationary cylinders fitted with triple-starting helical strakes subjected to steady uniform cross flows in a flume. The two cylinders were placed at various staggered and tandem positions. In total, 32 relative positions were tested with the streamwise spacing varied 2 to 15 diameters and the transverse spacing from 0 to 7.5 diameters. The hydrodynamic loading was measured in both the in-line and the cross-flow directions for each cylinder. The nominal Reynolds number, based on the cylinder diameter, ranged from 1.40 ×10 4 to 4.21 ×10 4 . It is found that, as expected, the straked cylinder has a higher drag coefficient in comparison with its smooth counterpart. Qualitatively, the interaction between the two straked cylinders is similar to that between two smooth cylinders in terms of the mean hydrodynamic coefficients. It is further found that whilst the strakes reduce the fluctuating forces on the upstream cylinder, the reduction is significantly smaller for the down-stream straked cylinder.",
keywords = "strakes circular cylinder vortex-induced vibration (VIV) cylinder interference, hydrodynamic coefficients, two fixed circular cylinders, helical strakes , tandem arrangements, vortex-induced vibration (VIV), cylinder interference, circular cylinder",
author = "Shan Huang and Andy Sworn",
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Hydrodynamic coefficients of two fixed circular cylinders fitted with helical strakes at various staggered and tandem arrangements. / Huang, Shan; Sworn, Andy.

In: Applied Ocean Research, Vol. 43, No. October, 10.2013, p. 21-26.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hydrodynamic coefficients of two fixed circular cylinders fitted with helical strakes at various staggered and tandem arrangements

AU - Huang, Shan

AU - Sworn, Andy

PY - 2013/10

Y1 - 2013/10

N2 - Experimental results are presented in the paper of two identical stationary cylinders fitted with triple-starting helical strakes subjected to steady uniform cross flows in a flume. The two cylinders were placed at various staggered and tandem positions. In total, 32 relative positions were tested with the streamwise spacing varied 2 to 15 diameters and the transverse spacing from 0 to 7.5 diameters. The hydrodynamic loading was measured in both the in-line and the cross-flow directions for each cylinder. The nominal Reynolds number, based on the cylinder diameter, ranged from 1.40 ×10 4 to 4.21 ×10 4 . It is found that, as expected, the straked cylinder has a higher drag coefficient in comparison with its smooth counterpart. Qualitatively, the interaction between the two straked cylinders is similar to that between two smooth cylinders in terms of the mean hydrodynamic coefficients. It is further found that whilst the strakes reduce the fluctuating forces on the upstream cylinder, the reduction is significantly smaller for the down-stream straked cylinder.

AB - Experimental results are presented in the paper of two identical stationary cylinders fitted with triple-starting helical strakes subjected to steady uniform cross flows in a flume. The two cylinders were placed at various staggered and tandem positions. In total, 32 relative positions were tested with the streamwise spacing varied 2 to 15 diameters and the transverse spacing from 0 to 7.5 diameters. The hydrodynamic loading was measured in both the in-line and the cross-flow directions for each cylinder. The nominal Reynolds number, based on the cylinder diameter, ranged from 1.40 ×10 4 to 4.21 ×10 4 . It is found that, as expected, the straked cylinder has a higher drag coefficient in comparison with its smooth counterpart. Qualitatively, the interaction between the two straked cylinders is similar to that between two smooth cylinders in terms of the mean hydrodynamic coefficients. It is further found that whilst the strakes reduce the fluctuating forces on the upstream cylinder, the reduction is significantly smaller for the down-stream straked cylinder.

KW - strakes circular cylinder vortex-induced vibration (VIV) cylinder interference

KW - hydrodynamic coefficients

KW - two fixed circular cylinders

KW - helical strakes

KW - tandem arrangements

KW - vortex-induced vibration (VIV)

KW - cylinder interference

KW - circular cylinder

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