FLUID DAMPING OF AN ELASTIC CYLINDER IN A CROSS-FLOW

C. Y. Zhou, R. M C So, Marc Mignolet

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Damping characteristics of fluid-structure systems are difficult to measure or calculate. In the past, such data have been rather scarce. This study reports an attempt on the use of a numerical approach to derive damping ratios related to fluid-structure interactions. It is based on an autoregressive moving-average (ARMA) method, which is used to analyse the displacement time series obtained from a numerical simulation of an elastic cylinder in a uniform cross-flow. The damping ratios show a similar trend to those obtained in previous experiments. An alternative way to deduce damping ratios is to decompose the transverse force in the structural dynamics equation into a drag (or out-of-phase) and an inertia (or in-phase) component for analysis. The damping thus deduced is in fair agreement with that obtained from ARMA; however, at or near synchronization, where the natural frequency of the stationary cylinder is close to the vortex shedding frequency, there is a very substantial difference between the two results.

Original languageEnglish (US)
Pages (from-to)303-322
Number of pages20
JournalJournal of Fluids and Structures
Volume14
Issue number3
DOIs
StatePublished - Apr 2000

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Damping
Fluids
Fluid structure interaction
Vortex shedding
Structural dynamics
Drag
Time series
Natural frequencies
Synchronization
Computer simulation
Experiments

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

FLUID DAMPING OF AN ELASTIC CYLINDER IN A CROSS-FLOW. / Zhou, C. Y.; So, R. M C; Mignolet, Marc.

In: Journal of Fluids and Structures, Vol. 14, No. 3, 04.2000, p. 303-322.

Research output: Contribution to journalArticle

Zhou, C. Y. ; So, R. M C ; Mignolet, Marc. / FLUID DAMPING OF AN ELASTIC CYLINDER IN A CROSS-FLOW. In: Journal of Fluids and Structures. 2000 ; Vol. 14, No. 3. pp. 303-322.
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