| Full text | |
| Author(s): |
Franzini, Guilherme R.
[1, 2, 3, 4]
;
Goncalves, Rodolfo T.
[1]
;
Pesce, Celso P.
[4]
;
Fujarra, Andre L. C.
[1, 4]
;
Mazzilli, Carlos E. N.
[3]
;
Meneghini, Julio R.
[2]
;
Mendes, Pedro
[5]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Escola Politecn, TPN Numer Offshore Tank, BR-2231 Sao Paulo - Brazil
[2] Univ Sao Paulo, Escola Politecn, NDF Fluids & Dynam Res Grp, BR-2231 Sao Paulo - Brazil
[3] Univ Sao Paulo, Escola Politecn, LMC Lab Computat Mech, BR-2231 Sao Paulo - Brazil
[4] Univ Sao Paulo, Escola Politecn, LMO Offshore Mech Lab, BR-2231 Sao Paulo - Brazil
[5] Petrobras SA, Rio De Janeiro - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Journal of the Brazilian Society of Mechanical Sciences and Engineering; v. 37, n. 2, p. 589-599, MAR 2015. |
| Web of Science Citations: | 4 |
| Abstract | |
An experimental investigation of the vortex-induced vibration phenomenon on a long semi-immersed flexible cylinder in constant current profile were carried out at a recirculating water channel facility. The experiments are part of a comprehensive research project which aims a better understanding of non-linear riser dynamics. Vertical and prescribed monochromatic harmonic motions were imposed to the top with amplitude A(t)/L approximate to 1% causing eigenfrequencies modulations. The mass ratio parameter is m{*} approximate to 10, and the ratio between the total length L and the immersed length Lim is L/Lim approximate to 3.5. The Reynolds number Re range lies within the interval 10(3) < Re <10(4). Three values of motion frequency f(t) were imposed, being them f(t) : f(N,1) - 1:3, 1:2 and 1:1 where f(N,1) is the first eigenfrequency. The application of both the Fourier Transform and the Hilbert-Huang Transform allowed identifying subharmonic components and also frequency modulation aspects in the data. (AU) | |
| FAPESP's process: | 13/09802-2 - Investigation on the ow around yawed cylinders with low aspect ratio, focusing on the VIM (vortex-induced motion) of floating platforms |
| Grantee: | Guilherme Rosa Franzini |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |