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Wind and Structures
  Volume 8, Number 5, September 2005, pages 373-388
DOI: http://dx.doi.org/10.12989/was.2005.8.5.373
 


Aeroelastic forces on yawed circular cylinders: quasi-steady modeling and aerodynamic instability
Luigi Carassale, Andrea Freda and Giuseppe Piccardo

 
Abstract
    Quasi-steady approaches have been often adopted to model wind forces on moving cylinders in cross-flow and to study instability conditions of rigid cylinders supported by visco-elastic devices. Recently, much attention has been devoted to the experimental study of inclined and/or yawed circular cylinders detecting dynamical phenomena such as galloping-like instability, but, at the present state-of-the-art, no mathematical model is able to recognize or predict satisfactorily this behaviour. The present paper presents a generalization of the quasi-steady approach for the definition of the flow-induced forces on yawed and inclined circular cylinders. The proposed model is able to replicate experimental behaviour and to predict the galloping instability observed during a series of recent wind-tunnel tests.
 
Key Words
    quasi-steady modeling; aerodynamic instability; yawed cylinders; galloping.
 
Address
Dipartimento di Ingegneria Strutturale e Geotecnica, University of Genova, Via Montallegro 1, 16145 Genova, Italy
 

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