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INFLUENCE OF OBSTACLE ASPECT RATIO ON TRIPPED CYLINDER WAKES

Tiago B. Araugo
Institut Pprime, UPR CNRS 3346 ENSMA, Université de Poitiers BP 40109, France

Christophe Sicot
Institut Pprime, UPR CNRS 3346, ENSMA, Universite de Poitiers, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

Robert J. Martinuzzi
Department of Mechanical and Manufacturing Engineering Schulich School of Engineering, University of Calgary 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4

Jacques Boree
Institut Pprime, UPR CNRS 3346, ENSMA, Universite de Poitiers, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

Résumé

The influence of an asymmetrically mounted, single tripwire on the shedding and wake characteristics of a vertical, surface-mounted finite circular cylinder is investigated experimentally. Height-to-diameter aspect ratios of 3 and 6 are considered. It is shown that a critical position for the tripwire exists, which is characterised in an abrupt change in the shedding frequency and wake structure. Results further suggest that the tripwire can strengthen 2D wake properties. The influence of the aspect ratio is due to tip-wake flow interactions and thus differs fundamentally from two-dimensional geometries.