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Wind and Structures Volume 16, Number 4, April 2013 , pages 341-354 DOI: https://doi.org/10.12989/was.2013.16.4.341 |
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Maximum Vortex-Induced Vibrations of a square prism |
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A. Barrero-Gil and P. Fernandez-Arroyo
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| Abstract | ||
| This paper presents an experimental investigation concerning the peak amplitudes of oscillation of a square prism due to Vortex-Induced-Vibrations (VIV) as a function of the mass damping parameter m*S (the so called Griffin--plot); m*and S being, respectively, the non-dimensional mass and the mechanical (structural) damping ratio. With this purpose in mind, an electromagnetic actuator has been employed to provide controlled damping. During the experiments the mass--damping parameter was in the range 0.15 < m*S < 2.4. Experiments show that there is a value of m*S below which VIV appears combined with galloping and the prism oscillation increases monotonically with the incoming flow velocity. For m*S >0.3 the present experiments show a well-defined VIV phenomenon and, consequently, a Griffin-plot can be defined. | ||
| Key Words | ||
| Vortex-Induced Vibrations; Griffin plot; square prism | ||
| Address | ||
| A. Barrero-Gil and P. Fernandez-Arroyo : Aerospace Thermal and Fluids Mechanics Department, School of Aeronautics, Universidad Politecnica de Madrid, Plaza Cardenal Cisneros 3, 28040, Madrid, Spain | ||