Exciting Mechanisms of Rain-Wind-Induced Vibrations

Verwiebe, C.

doi:10.2749/101686698780489324

Cited by 7 publications

(3 citation statements)

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“…However, both parts simultaneously contribute to the forcing throughout the oscillation cycle. Qualitatively the mechanism seems similar to what was put forward for rain-wind vibrations by Verwiebe [4] and Cosentino et al [5]. According to Verwiebe a single underside rivulet can instigate large motion by causing an early underside separation and thus lift during upward movement.…”

Section: Flow Features and Excitation Mechanismmentioning

confidence: 69%

“…[3]). The other suggests that it is primarily the motion of the formed rivulet that is central in developing large response [4,5]. The role of influencing parameters such as the rainfall intensity, the cable inclination angle and roughness and the motion frequencies have been extensively studied and there is confidence in the knowledge of the combination of these contributions leading to dynamic instability.…”

Section: Introductionmentioning

confidence: 99%

“…The well known case of an inclined cylinder with an ogive or conical nose, as in missiles [10,11] provide this work with a very relevant precedent. Further connections are sought with rain-wind [4,12,5] and other flow-induced vibration phenomena [13,14], where unsteadiness also seems important.…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds numbers

Nikitas

Macdonald

2015

European Journal of Mechanics - B/Fluids

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a b s t r a c tThis article attempts to highlight characteristics of the aerodynamic forcing on a rigid circular cylinder experiencing dry galloping vibrations. Observations from a series of wind tunnel tests are studied comparatively with the literature on rain-wind cable vibrations and on flow past inclined lifting bodies such as missiles, for drawing similarities. Unsteadiness and spatial variation of the flow, both previously undermined, are significant during the large cylinder motions recorded. Thus, they are here suspected to play a role in triggering unstable behaviour. Instabilities were restricted to specific ranges of cablewind angles and Reynolds numbers. The transitional features identified refute the view of simple bursting separation bubbles that rhythmically produce lift and suggest that there is a multitude of paths for energetically feeding dry galloping. Finally explanations are provided and a mechanism incorporating unstable features is proposed for future modelling.Crown

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Section: Flow Features and Excitation Mechanismmentioning

confidence: 69%