| Full text | |
| Author(s): |
Assi, Gustavo R. S.
;
Crespi, Tommaso
;
ASME
Total Authors: 3
|
| Document type: | Journal article |
| Source: | PROCEEDINGS OF THE ASME 38TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2019, VOL 7A; v. N/A, p. 7-pg., 2019-01-01. |
| Abstract | |
Slender offshore structures of a cylindrical cross section, such as drilling and production risers, are susceptible to vortexinduced vibrations (VIV) when exposed to water currents. The present work presents an experimental investigation of the suppression of VIV of a circular cylinder by means of three different types of helical strakes: (i) a strake with continuous blades, (ii) a strake with serrated blades (or fins) and (iii) a strake with serrated blades individually twisted in relation to the incoming flow By altering the blade geometry to produce the twisted-bladed strake, it was possible to keep the same level of suppression of the cross-flow vibration achieved by conventional strakes, but reducing drag in 15%. Experiments have been conducted in a recirculating water channel at moderate Reynolds numbers. (AU) | |
| FAPESP's process: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 11/00205-6 - Investigation of new methods for suppressing flow-induced vibrations of offshore structures |
| Grantee: | Gustavo Roque da Silva Assi |
| Support Opportunities: | Regular Research Grants |