Behavior of oil platforms under the action of VIM and simultaneous wave incidence

• Grant number: 14/02043-1
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): May 01, 2014
• Effective date (End): April 30, 2016
• Field of knowledge: Engineering - Naval and Oceanic Engineering
• Principal Investigator: André Luís Condino Fujarra
• Grantee: Rodolfo Trentin Gonçalves
• Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The VIM - vortex-induced motions phenomenon is a particular way to call VIV - vortex-induced vibrations. VIM occurs in offshore platforms due to current incidence. Motions in the transverse direction are in the same order of the platform main dimension. These large amplitudes in the horizontal plane are responsible to decrease the fatigue life of the mooring and riser systems, therefore VIM must be consider in the initial design phases. The classification rules that talk about VIM do not come the simultaneous wave effects; the rules consider the effect of wave and current separately. This fact can increase the effect cost of the project and make the project unfeasible. The aim of the research program is to understand the behavior of oil platforms under the action of VIM and simultaneous wave incidence. In this way, critical analysis of the classification rules will be performed, as well as a new approach to consider these phenomena in the initial design phases. Experimental VIM database will be used to achieve the goal.

Scientific publications

(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, 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. Web of Science Citations: 1.

GONCALVES, RODOLFO T.; MENEGHINI, JULIO R.; FUJARRA, ANDRE L. C. Vortex-induced vibration of floating circular cylinders with very low aspect ratio. OCEAN ENGINEERING, v. 154, p. 234-251, APR 15 2018. Web of Science Citations: 5.

GONCALVES, RODOLFO T.; FUJARRA, ANDRE L. C.; ROSETTI, GUILHERME F.; KOGISHI, ANDRE M.; KOOP, ARJEN. Experimental study of the column shape and the roughness effects on the vortex-induced motions of deep-draft semi-submersible platforms. OCEAN ENGINEERING, v. 149, p. 127-141, FEB 1 2018. Web of Science Citations: 4.