| Summary: | 32nd ASME International Conference on Ocean, Offshore and Arctic ă Engineering, Nantes, FRANCE, JUN 09-14, 2013 International audience Bluff bodies can be prone to well-known self-excited instability such as ă galloping. Opposite to classical and well documented Vortex Induced ă Vibrations (VIV), oscillation amplitude is not bounded in such a way ă galloping-like instability can alter the integrity of the structure on ă short term. Although stability criteria exist in the literature [1], ă there is a real lack considering the cause and the way to inhibit such ă instability. ă It is consequently proposed in this paper to investigate the flow over ă the classical `non-circular' structure, i.e the square box body, by ă means of advanced Spectral Large Eddy Simulation (LES) solver, [16], ă [17] & [18]. The main objectives of this numerical analysis will be ă to provide an accurate solution to underline the possible mechanisms ă that trigger the instability as well as a base solution for future wake ă stability & control analysis, [6].
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