Flow-Induced Motions of Multiple Risers

[+] Author and Article Information
T. Overvik, G. Moe

Division of Port and Ocean Engineering, Norwegian Institute of Technology, Trondheim, Norway

E. Hjort-Hansen

Division of Structural Mechanics, Norwegian Institute of Technology, Trondheim, Norway

J. Energy Resour. Technol 105(1), 83-89 (Mar 01, 1983) (7 pages) doi:10.1115/1.3230885 History: Received July 01, 1981; Revised October 13, 1982; Online October 22, 2009


Vortex-induced and galloping vibrations of flexible risers in steady, uniform currents have been investigated. The cross sections consisted of a bundle of pipes tied together to form a so-called multiple production riser, see Fig. 3(b). The tests have been carried out in a wind tunnel at subcritical Reynolds numbers, using spring-mounted sectional models. The tests used the single tube case as a reference case, and the results indicated increased motions for all of the multiple configurations compared to the reference case. For some cases, vortex-induced motions gave the largest excursions, for others galloping. Crude calculations indicate that a typical 400-m depth riser configuration would experience significant galloping motions as well as vortex-induced motions in steady, uniform currents at 0.5 m/s or less.

Copyright © 1983 by ASME
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