Numerical simulation of flows around two unyawed and yawed wavy cylinders in tandem arrangement

K. Lam, Y. F. Lin, L. Zou, Yang Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

The turbulent flows around two fixed unyawed and yawed wavy cylinders in tandem arrangement at a subcritical Reynolds number of 3900 were studied using three-dimensional large eddy simulation. A range of spacing (L) between the cylinders from 1.5Dmto 5.5Dmwith yaw angles of α=0°, 30° were investigated so as to identify the effects of cylinder spacing ratio and yaw angle as well as the coupling effects of the two wavy cylinders in tandem. The instantaneous near wake flow patterns around the cylinders were captured. Flows around circular cylinders with the same configurations were also obtained for comparison. The effects of the vortex shedding from the upstream cylinder on the fluid-dynamic forces acting on the downstream one were examined. Results show that vortex shedding behind the upstream wavy cylinder occurs at a further downstream position compared with that of the circular upstream cylinder. This leads to the weakening of the effect of bodies' vibration of the cylinders as well as an evident reduction of drag. With a yaw angle of 30°, the vortex formation lengths behind both the upstream and downstream cylinders decrease, typically for the wavy cylinders configuration. However, the effects of drag reduction and the control of bodies' vibration still exist except for the spacing ratio of L/Dm=3.5, which is in the critical spacing ratio regime for two wavy cylinders in tandem.
Original languageEnglish
Pages (from-to)135-151
Number of pages17
JournalJournal of Fluids and Structures
Volume28
DOIs
Publication statusPublished - 1 Jan 2012

Keywords

  • Large eddy simulation
  • Tandem arrangement
  • Vortex shedding
  • Yawed wavy cylinders

ASJC Scopus subject areas

  • Mechanical Engineering

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