Experimental investigation of the flow-induced vibration of a curved cylinder in convex and concave configurations

Autor(es)

Assi, Gustavo R. S. ^[1] ; Srinil, Narakorn ^[2] ; Freire, Cesar M. ^[3] ; Korkischko, Ivan ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Naval Architecture & Ocean Engn, BR-05508030 Sao Paulo - Brazil

^[2] Univ Strathclyde, Dept Naval Architecture & Marine Engn, Glasgow, Lanark - Scotland

^[3] Univ Sao Paulo, Dept Mech Engn, BR-05508030 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF FLUIDS AND STRUCTURES; v. 44, p. 52-66, JAN 2014.
• Citações Web of Science: 13

Resumo

Experiments have been conducted to investigate the two-degree-of-freedom vortex-induced vibration (VIV) response of a rigid section of a curved circular cylinder with low mass-damping ratio. Two curved configurations, a concave and a convex, were tested regarding the direction of the flow, in addition to a straight cylinder that served as reference. Amplitude and frequency responses are presented versus reduced velocity for a Reynolds number range between 750 and 15 000. Results for the curved cylinders with concave and convex configurations revealed significantly lower vibration amplitudes when compared to the typical VIV response of a straight cylinder. However, the concave cylinder showed relatively higher amplitudes than the convex cylinder which were sustained beyond the typical synchronisation region. We believe this distinct behaviour between the convex and the concave configurations is related to the wake interference taking place in the lower half of the curvature due to perturbations generated in the horizontal section when it is positioned upstream. Particle-image velocimetry (PIV) measurements of the separated flow along the cylinder highlight the effect of curvature on vortex formation and excitation revealing a complex fluid-structure interaction mechanism. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/00053-9 - Vibração induzida por vórtices com dois graus de liberdade e efeito de interferência
• Beneficiário: Cesar Monzu Freire
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 11/00205-6 - Desenvolvimento de métodos de supressão de vibrações induzidas pelo escoamento em estruturas oceânicas
• Beneficiário: Gustavo Roque da Silva Assi
• Modalidade de apoio: Auxílio à Pesquisa - Regular