Abstract
The present work presents an experimental investigation of the suppression of vortex-induced vibrations of a circular cylinder by means of helical strakes. Experiments have been per- formed in a water channel at moderate Reynolds numbers. Three different types of helical strakes are compared: (i) a continuous helical strake, (ii) a helical strake with serrated blades and (iii) a helical strake with serrated blades but inverted (negative) in relation to the helical pitch of the strake. While the serrated- blade strake appeared as an improvement over the conventional model, the novel negative-bladed strake produced worse results, allowing for the return of resonant VIV. The most effective VIV suppressor was the bladed strake, achieving a reduction of 88% in the peak amplitude of vibration when compared to that of a bare cylinder during resonance. We conclude that simply inverting the local angle of attack of the individual blades (or fins) in relation to the helical pitch of the strake does not improve the performance of the strake in terms of VIV suppression.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Tognarelli, M., Taggart, S., Campbell, M.: Actual VIV fatigue response of full-scale drilling risers: with and without suppression devices. In: Proceedings of the 27th International Conference on Ocean, Offshore and Arctic Engineering (ASME-OMAE 2008), p. 57046 (2008)
Taggart, S., Tognarelli, M.: Offshore drilling riser VIV suppression devices - what’s available to operators?. In: Proceedings of the 27th International Conference on Ocean, Offshore and Arctic Engineering (ASME- OMAE 2008), p. 57047 (2008)
Assi, G.R., Bearman, P.W., Tognarelli, M.A.: On the stability of a free-to-rotate short-tail fairing and a splitter plate as suppressors of vortex-induced vibration. Ocean Eng. 92, 234–244 (2014)
Silva-Ortega, M., Assi, G.: Flow-induced vibration of a circular cylinder surrounded by two, four and eight wake-control cylinders. Exp. Therm. Fluid Sci. 85, 354–362 (2017)
Korkischko, I., Meneghini, J.R.: Experimental investigation of flow-induced vibration on isolated and tandem circular cylinders fitted with strakes. J. Fluids Struct. 26(4), 611–625 (2010)
Freire, C.M., Meneghini, J.R., Gioria, R.S., Assi, G.R.S.: Comparison between the Koopman modes for the flow around circular cylinder and circular cylinder fitted with helical strakes. In: Theofilis, V., Soria, J. (eds.) Instability and Control of Massively Separated Flows. Fluid Mechanics and its Applications, vol. 107. Springer (2015)
Assi, G.R.S., Bearman, P.W., Carmo, B.S., Meneghini, J.R., Sherwin, S.J., Willden, R.H.J.: The role of wake stiffness on the wake-induced vibration of the downstream cylinder of a tandem pair. J. Fluid Mech. 718(3), 210–245 (2013)
Assi, G., Bearman, P., Kitney, N., Tognarelli, M.: Suppression of wake-induced vibration of tandem cylinders with free-to-rotate control plates. J. Fluids Struct. 26, 1045–1057 (2010)
Assi, G.R.S., Bearman, P.W., Meneghini, J.R.: On the wake-induced vibration of tandem circular cylinders: the vortex interaction excitation mechanism. J. Fluid Mech. 661(10), 365–401 (2010)
Assi, G.R.S.: Mechanisms for flow-induced vibration of interfering bluff bodies. Ph.D. thesis, Imperial College London (2009)
Chaplin, J., Teigen, P.: Steady flow past a vertical surface-piercing circular cylinder. J. Fluids Struct. 18(3), 271–285 (2003)
Williamson, C.H.K., Govardhan, R.: Vortex-induced vibrations. Ann. Rev. Fluid Mech. 36, 413–455 (2004)
Blevins, R.D.: Flow-Induced Vibration, 2nd edn. Van Nostrand Reinhold, New York (1990)
Acknowledgment
We gratefully acknowledge support of the RCGI Research Centre for Gas Innovation, hosted by the University of São Paulo (USP) and sponsored by FAPESP São Paulo Research Foundation (2014/50279-4) and Shell Brasil. GRSA acknowledges the support of FAPESP (2011/00205-6) and CNPq (306917/2015-7).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Switzerland AG
About this paper
Cite this paper
Assi, G.R.S., Crespi, T. (2020). Comparison of Serrated Helical Strakes in Suppressing the Vortex-Induced Vibrations of a Circular Cylinder. In: Carreño Moreno, V., Vega Saenz, A., Carral Couce, L., Saravia Arenas, J. (eds) Proceeding of the VI International Ship Design & Naval Engineering Congress (CIDIN) and XXVI Pan-American Congress of Naval Engineering, Maritime Transportation and Port Engineering (COPINAVAL). CIDIN COPINAVAL 2019 2019. Springer, Cham. https://doi.org/10.1007/978-3-030-35963-8_24
Download citation
DOI: https://doi.org/10.1007/978-3-030-35963-8_24
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-35962-1
Online ISBN: 978-3-030-35963-8
eBook Packages: EngineeringEngineering (R0)