Investigation on the ow around yawed cylinders with low aspect ratio, focusing on the VIM (vortex-induced motion) of floating platforms

• Grant number: 13/09802-2
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: September 01, 2013
• End date: March 31, 2014
• Field of knowledge: Engineering - Naval and Oceanic Engineering - Hydrodynamics of Ships and Ocean Systems
• Principal Investigator: André Luís Condino Fujarra
• Grantee: Guilherme Rosa Franzini
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The ow around yawed cylinders, or oblique flow, is a common problem in several engineering conditions. An example of offshore application consists on the flow around risers hanged in catenary. A more recent example of application is the ow around the columns of a Tension Leg Platform (TLP). Despite the fact that the ow around a nonyawed cylinder consists on a extensively studied problem within the uid mechanics scope, the number of investigations concerning oblique flow is significantly lower than those related to non-oblique flow. The most employed approach for the study of the obliqueflow is the Independence Principle, which states that the wake characteristics depend onlyon the component of the free-stream that is orthogonal do the cylinder axis. It is wellknown in the literature that the ow developed at the upstream end of the cylinder playsan important role in the wake characteristics. The purpose of the post-doctoral researchis to investigate numerically and experimentally the flow around yawed cylinders withasymmetrical end-conditions. The results will consist on a complementary informationto the experimental ones obtained during the PhD research program developed by thecandidate, as well as a database that supports the design of new types of floating platforms.

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FRANZINI, GUILHERME R.; GONCALVES, RODOLFO T.; PESCE, CELSO P.; FUJARRA, ANDRE L. C.; MAZZILLI, CARLOS E. N.; MENEGHINI, JULIO R.; MENDES, PEDRO. Vortex-induced vibration experiments with a long semi-immersed flexible cylinder under tension modulation: Fourier transform and Hilbert-Huang spectral analyses. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 37, n. 2, p. 589-599, MAR 2015. (13/09802-2)

FRANZINI, GUILHERME R.; GONCALVES, RODOLFO T.; MENEGHINI, JULIO R.; FUJARRA, ANDRE L. C.. Experimental Investigation Into the Flow Around a Stationary and Yawed Cylinder Under Asymmetrical End Conditions. INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING, v. 24, n. 2, p. 90-97, JUN 2014. (08/00688-4, 13/09802-2)

FRANZINI, G. R.; PESCE, C. P.; GONCALVES, R. T.; FUJARRA, A. L. C.; MENDES, P.. An experimental investigation on concomitant Vortex-Induced Vibration and axial top-motion excitation with a long flexible cylinder in vertical configuration. OCEAN ENGINEERING, v. 156, p. 596-612, MAY 15 2018. (14/02043-1, 13/09802-2)

FRANZINI, GUILHERME R.; PESCE, CELSO P.; SALLES, RAFAEL; GONCALVES, RODOLFO T.; FUJARRA, ANDRE L. C.; MENDES, PEDRO. Experimental Analysis of a Vertical and Flexible Cylinder in Water: Response to Top Motion Excitation and Parametric Resonance. JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME, v. 137, n. 3, JUN 2015. (13/09802-2)