Journal
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
Volume 99, Issue 6-7, Pages 748-756Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jweia.2011.03.009
Keywords
Aeroelastic phenomena; Yawed galloping; Critical conditions; Dynamic instability; Fluid-structure interaction
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This paper concerns the study of galloping critical conditions on square cylinders with an arbitrary attitude in the wind flow. It is based on a consistent theoretical model of wind actions, which permits the analysis of a generic-shaped cross-section. A generalized definition of the aerodynamic damping matrix as function of both the angle of incidence and the angle of skew is proposed. The availability of specific experimental data allows a sound definition of aerodynamic actions. The analysis of critical conditions can be performed in closed form in the plane of the aerodynamic damping matrix invariants. Preliminary results obtained in smooth-flow conditions point out that yaw effects might influence critical conditions from a quantitative point of view, but do not destroy the instability domain obtained in the classical cross-flow conditions. (C) 2011 Elsevier Ltd. All rights reserved.
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