Effect of an internal nonlinear rotational dissipative element on vortex shedding and vortex-induced vibration of a sprung circular cylinder

Ravi Kumar R. Tumkur, Arne J. Pearlstein, Arif Masud, Oleg V. Gendelman, Antoine B. Blanchard, Lawrence Bergman, Alexander F. Vakakis

Research output: Contribution to journalArticlepeer-review

Abstract

We computationally investigate coupling of a nonlinear rotational dissipative element to a sprung circular cylinder allowed to undergo transverse vortex-induced vibration (VIV) in an incompressible flow. The dissipative element is a 'nonlinear energy sink' (NES), consisting of a mass rotating at fixed radius about the cylinder axis and a linear viscous damper that dissipates energy from the motion of the rotating mass. We consider the Reynolds number range 20≤Re≤ 120, with Re based on cylinder diameter and free-stream velocity, and the cylinder restricted to rectilinear motion transverse to the mean flow. Interaction of this NES with the flow is mediated by the cylinder, whose rectilinear motion is mechanically linked to rotational motion of the NES mass through nonlinear inertial coupling. The rotational NES provides significant 'passive' suppression of VIV. Beyond suppression however, the rotational NES gives rise to a range of qualitatively new behaviours not found in transverse VIV of a sprung cylinder without an NES, or one with a 'rectilinear NES', considered previously. Specifically, the NES can either stabilize or destabilize the steady, symmetric, motionless-cylinder solution and can induce conditions under which suppression of VIV (and concomitant reduction in lift and drag) is accompanied by a greatly elongated region of attached vorticity in the wake, as well as conditions in which the cylinder motion and flow are temporally chaotic at relatively low Re.

Original languageEnglish (US)
Pages (from-to)196-235
Number of pages40
JournalJournal of Fluid Mechanics
Volume828
DOIs
StatePublished - Oct 10 2017

Keywords

  • Chaos
  • flow-structure interactions
  • vortex shedding

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Effect of an internal nonlinear rotational dissipative element on vortex shedding and vortex-induced vibration of a sprung circular cylinder'. Together they form a unique fingerprint.

Cite this