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Abstract
The current paper considers large galloping-like vibrations of circular cylinders, generically inclined and yawed to the flow. The case of a round section prone to galloping is seemingly a paradox since rotational symmetry (or close to it) and classical galloping are apparently contradictory. Still there seems to be a range of wind speeds far from those for typical Kármán vortex shedding resonance where such a phenomenon does occur. Experimental results from both static and dynamic large-scale rigid cable models, presented here, show that this range coincides with the critical Reynolds number regime, where notable symmetry-breaking characteristics such as nonzero mean lift emerge. It is shown that a fundamental difference between the inclined and non-inclined cylinder aerodynamics may exist accommodating different pressure distributions and different resulting dynamic behaviours. Unsteady pressure measurements showing avalanche-like “jumps” and vortex dislocations building between cell structures in the cylinder spanwise direction are conjectured to be a key element in the unstable behaviour experienced.
Original language | English |
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Pages (from-to) | 1295-1306 |
Journal | Experiments in Fluids |
Volume | 52 |
Issue number | 5 |
Early online date | 31 Dec 2011 |
DOIs | |
Publication status | Published - May 2012 |
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Dive into the research topics of 'Critical Reynolds number and galloping instabilities – Experiments on circular cylinders'. Together they form a unique fingerprint.Projects
- 1 Finished
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AEROELASTIC AND NON-LINEAR STRUCTURAL DYNAMIC INTERACTIONS OF SLENDER STRUCTURES
1/08/06 → 1/08/11
Project: Research