Wake galloping phenomena between two parallel/unparallel cylinders

Sunjoong Kim, Ho Kyung Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


The characteristics of wake galloping phenomenon for two parallel/unparallel circular cylinders were investigated via wind tunnel tests. The two cylinders were initially deployed in parallel and wake galloping phenomena were observed by varying the center-to-center distance. The effect of an unparallel arrangement of two cylinders was next investigated by fixing the spacing ratio of one side of the cylinders at 5.0D and the other side at 3.0D, in which D represents the diameter of the cylinder. For the unparallel disposition, the 5.0D side showed a small, limited vibration while the 3.0D side produced much larger amplitude of vibration, resulting in a rolling motion. However, the overall amplitude appeared to decrease in unparallel disposition when compared with the amplitude of the 3.0D - 3.0D parallel case. This represents the mitigation effect of wake galloping due to the unparallel disposition between two cylinders. Flow visualization tests with particle image velocimetry were conducted to identify flow fields between two cylinders. The test results demonstrate the existence of a complex interaction of the downstream cylinder with the shear layer generated by the upstream cylinder. When the spacing ratio was large enough, the shear layer was not observed and the downstream cylinder showed only limited random vibration.

Original languageEnglish
Pages (from-to)511-528
Number of pages18
JournalWind and Structures, An International Journal
Issue number5
StatePublished - May 2014


  • Flow visualization
  • Particle image velocimetry (PIV)
  • Shear layer
  • Stay cable
  • Unparallel
  • Wake galloping
  • Wind tunnel test


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