High-order simulation of the flow instability over a non-circular structure

• Published in: Volume 7: CFD and VIV
• Main Authors: Minguez, Matthieu, Meliga, Philippe, Serre, Eric
• Other Authors: Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2013
• Subjects: [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph]; Arctic
• Online Access: https://hal.archives-ouvertes.fr/hal-01309838; https://hal.archives-ouvertes.fr/hal-01309838/document; https://hal.archives-ouvertes.fr/hal-01309838/file/Minguez2013.pdf; https://doi.org/10.1115/OMAE2013-10200

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