Assi, Gustavo R. S.
Bearman, Peter W.
Tognarelli, Michael A.
Total Authors: 3
 Univ Sao Paulo, Dept Naval Architecture & Ocean Engn, BR-05508030 Sao Paulo - Brazil
 Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London - England
 BP Amer Prod Co, Houston, TX - USA
Total Affiliations: 3
DEC 1 2014.
Web of Science Citations:
Experiments in the Reynolds number range of 1000 to 12,000 have been carried out on a free-to-rotate short-tail fairing fitted to a rigid length of circular cylinder to investigate the effect of rotational friction on the stability of this type of VIV suppressor. Measurements of the dynamic response are presented for models with low mass and damping which are free to respond in the cross-flow and streamwise directions. It is shown how vortex-induced vibration can be reduced if the rotational friction between the cylinder and the short-tail fairing exceeds a critical limit. In this configuration the fairing finds a stable position deflected from the flow direction and a steady lift force appears towards the side to which the fairing has deflected. The fluid-dynamic mechanism is very similar to that observed for a free-to-rotate splitter plate of equivalent length. A non-rotating fairing as well as splitter plates is shown to develop severe galloping instabilities in 1-dof experiments. (C) 2014 Elsevier Ltd. All rights reserved. (AU)