Header menu link for other important links
X
Flow-induced oscillations of three tandem circular cylinders in a two-dimensional flow
Published in Academic Press
2019
Volume: 91
   
Abstract
Flow-induced oscillations of three identical circular cylinders, arranged in tandem configuration, are studied via two-dimensional finite element computations. Cylinders are mounted on elastic supports in the streamwise and transverse directions. Each downstream cylinder is placed at a distance of 5 diameters (5D) from its immediate upstream neighbor. Nondimensional mass ( m∗) of 2, and zero damping (ξ) are considered. Simulations are performed with the objective of understanding dynamic response of cylinders, as they are subject to wake interference, at constant Reynolds number, Re=150, and for varying reduced velocity (U∗) in the range of U∗=2−14. Similar to the behavior of an isolated cylinder at low Re, oscillation response of the upstream body exhibits initial excitation and lower lock-in regimes. However, for both the downstream cylinders, depending on their amplitude and frequency responses, the synchronization regime of U∗ can be categorized into three distinct regions: initial excitation, upper and lower lock-in regions. First downstream cylinder undergoes gradual transition between initial excitation and upper region, whereas the second downstream body exhibits this transition in two phases, which are separated by a periodic oscillation response regime. Upper lock-in region is characterized by periodic oscillations, while amplitude is modulated in the lower region. Only 2S shedding mode is observed for all the U∗ considered. © 2019
About the journal
JournalJournal of Fluids and Structures
PublisherAcademic Press
ISSN08899746
Open AccessNo
Concepts (14)
  •  related image
    Frequency response
  •  related image
    Hysteresis
  •  related image
    Locks (fasteners)
  •  related image
    Oscillating cylinders
  •  related image
    Reynolds number
  •  related image
    DOWNSTREAM CYLINDERS
  •  related image
    FINITE ELEMENT COMPUTATIONS
  •  related image
    FLOW-INDUCED OSCILLATION
  •  related image
    Lock-in
  •  related image
    PERIODIC OSCILLATION
  •  related image
    PRIMARY VORTEX
  •  related image
    Tandem configuration
  •  related image
    Two-dimensional flow
  •  related image
    Circular cylinders