Mass ratio and afterbody effects in flow-induced vibrations of a 3:2 rectangular cylinder

Tommaso Massai, Jisheng Zhao, David Lo Jacono, John Sheridan

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Abstract

The present study aims at describing the evolution of the dynamical response observed for a rectangular section of side ratio (SR) 1.5 tested in a low mass ratio (m*) range. The transition between very low to higher m* regimes for these reference sections has not been documented yet in the reference literature. A wide experimental campaign was performed in a recirculating water channel to investigate a low m* regime, using a purposely designed test rig allowing both static and dynamic tests on light cross-sectional models. In particular displacement and force measurements were taken. The SR was varied in order to evaluate the afterbody effect on models’ aerodynamics and amplitude response. Given that there is evidence for the resultant cross-sections to exhibit a behavior in which VIV and galloping interact in airflow (higher m*), the possible m*
threshold for which such an interaction takes place was determined. This task was well described and related to SR = 1.5, whereas the comparisons with the
other sections developed differently though peculiar response branches. The role of interacting higher harmonics of both VIV and galloping is also briefly discussed.
Original languageEnglish
Title of host publication14th International Conference on Wind Engineering
Number of pages8
Publication statusPublished - 2015
EventInternational Conference on Wind Engineering 2015 - Porto Alegre, Brazil
Duration: 21 Jun 201526 Jun 2015
Conference number: 14th
https://14thinternationalcon.eventize.com.br/

Conference

ConferenceInternational Conference on Wind Engineering 2015
Abbreviated titleICWE 2015
Country/TerritoryBrazil
CityPorto Alegre
Period21/06/1526/06/15
Internet address

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