Experimental Investigation Into the Flow Around a Stationary and Yawed Cylinder Under Asymmetrical End Conditions

Autor(es)

Franzini, Guilherme R. ^[1] ; Goncalves, Rodolfo T. ^[2] ; Meneghini, Julio R. ^[1] ; Fujarra, Andre L. C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Politecn, Fluids & Dynam Res Grp NDF, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Escola Politecn, Numer Offshore Tank TPN, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING; v. 24, n. 2, p. 90-97, JUN 2014.
• Citações Web of Science: 3

Resumo

Experiments with stationary and yawed cylinders were carried out at a recirculating water channel facility and aimed to study the effects of the inclination in the force coefficients and in the vortex-shedding frequency. The cylinders were inclined at 0 (non-yawed case), 10, 20, 30, and 45 degrees. Force coefficients and the Strouhal number were evaluated by using the Independence Principle (IF), which states a dependence of the flow characteristics only on the component of velocity normal to the cylinder axis. The experimental results showed that when the cylinder was yawed at 45 degrees, there was no regular vortex-shedding regime. A new result is the fact that the lift force spectra, as well as the mean drag coefficient, are different if the cylinder is yawed in upstream or downstream orientation. This difference is associated with the asymmetrical end conditions of the cylinder. (AU)

• Processo FAPESP: 08/00688-4 - Investigação do fenômeno de VIV Vibração Induzida por Vórtices: em cilindros flexíveis
• Beneficiário: Guilherme Rosa Franzini
• Linha de fomento: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 13/09802-2 - Estudo do escoamento ao redor de cilindros inclinados e de baixa razão de aspecto com vistas ao movimento induzido pela emissão de vórtices (MIV) de plataformas flutuantes
• Beneficiário: Guilherme Rosa Franzini
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado