Simulation of Scour around a Vibrating Pipe in Steady Currents
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 2
Abstract
A vertical two-dimensional numerical model is employed to study the scour beneath a vibrating pipe exposed to steady currents. The ability of the model is first validated against previous scour experiments concerning both fixed and vibrating pipes. Both the development of scour depth and the final bed profile are generally well reproduced by the model. Subsequently, a broad range of the vibration parameters, including the amplitude and frequency, are tested to reveal their influences on the equilibrium scour depth. A generic relationship between the vibration frequency, amplitude, and scour depth is established by constructing suitable nondimensional groups. The maximum scour depth is shown to increase with the vibration amplitude and frequency. At small frequencies, both the frequency and amplitude have a pronounced influence on the scour depth; with the increase of the vibration frequency, the influence of the frequency gradually diminishes and the scour depth is mainly decided by the vibration amplitude. Two empirical formulas are proposed to describe the quantitative relationship between the frequency, amplitude, and scour depth.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors thank the financial support by the National Natural Science Foundation of China (Grant No. 51479111) and by the State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University (Grant No. GKZD010061).
References
Bearman, P. W., and Zdravkovich, M. M. (1978). “Flow around a circular cylinder near a plane boundary.” J. Fluid Mech., 89(1), 33–47.
Bijker, E. W., and Leeuwestein, W. (1984). “Interaction between pipelines and the seabed under the influence of waves and currents.” Seabed mechanics, Graham & Trotman, London, 235–242.
Brørs, B. (1999). “Numerical modeling of flow and scour at pipelines.” J. Hydraul. Eng., 511–523.
Chiew, Y. M. (1990). “Mechanics of local scour around submarine pipelines.” J. Hydraul. Eng., 515–529.
Chiew, Y. M. (1991). “Prediction of maximum scour depth at submarine pipelines.” J. Hydraul. Eng., 452–466.
Fredsøe, J., Sumer, B. M., Andersen, J., and Hansen, E. A. (1987). “Transverse vibrations of a cylinder very close to a plane wall.” J. Offshore Mech. Arct. Eng., 109(1), 52–60.
Gao, F. P., Yang, B., Wu, Y. X., and Yan, S. M. (2006). “Steady current induced seabed scour around a vibrating pipeline.” Appl. Ocean Res., 28(5), 291–298.
Li, F. Z., Dwivedi, A., Low, Y. M., Hong, J. H., and Chiew, Y. M. (2013). “Experimental investigation on scour under a vibrating catenary riser.” J. Eng. Mech., 868–878.
Liang, D., and Cheng, L. (2005). “Numerical model for wave-induced scour below a submarine pipeline.” J. Waterw. Port Coastal Ocean Eng., 193–202.
Liang, D., and Cheng, L. (2008). “Numerical study of scour around a pipeline bundle.” Proc. ICE - Maritime Eng., 161(2), 89–95.
Liang, D., Cheng, L., and Li, F. (2005). “Numerical modeling of flow and scour below a pipeline in currents. Part II: Scour simulation.” Coastal Eng., 52(1), 43–62.
Liang, D., Gotoh, H., Scott, N., and Tang, H. (2013). “Experimental study of local scour around twin piles in oscillatory flows.” J. Waterw. Port Coastal Ocean Eng., 404–412.
Luan, Y. (2014). “Numerical analysis of two-dimensional scour beneath a pipeline undergoing forced vibration.” M.Phil. thesis, Dept. of Engineering, Univ. of Cambridge, Cambridge, U.K.
Sumer, B. M., and Fredsøe, J. (1990). “Scour below pipelines in waves.” J. Waterw. Port Coastal Ocean Eng., 307–323.
Sumer, B. M., Mao, Y., and Fredsøe, J. (1988). “Interaction between vibrating pipe and erodible bed.” J. Waterw. Port Coastal Ocean Eng., 81–92.
Sumer, B. M., Truelsen, C., Sichmann, T., and Fredsøe, J. (2001). “Onset of scour below pipelines and self-burial.” Coastal Eng., 42(4), 313–335.
Tsahalis, D. T. (1984). “Vortex-induced vibrations of a flexible cylinder near a plane boundary exposed to steady and wave-induced currents.” J. Energy Resour. Technol., 106(2), 206–213.
Yang, B., Gao, F. P., Jeng, D. S., and Wu, Y. X. (2008). “Experimental study of vortex-induced vibrations of a pipeline near an erodible sandy seabed.” Ocean Eng., 35(3), 301–309.
Zhao, M., and Cheng, L. (2008). “Numerical modeling of local scour below a piggyback pipeline in currents.” J. Hydraul. Eng., 1452–1463.
Zhao, M., and Cheng, L. (2010). “Numerical investigation of local scour below a vibrating pipeline under steady currents.” Coastal Eng., 57(4), 397–406.
Zyserman, J. A., and Fredsøe, J. (1990). “Data analysis of bed concentration of suspended sediment.” J. Hydraul. Eng., 1021–1042.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 22, 2014
Accepted: Jul 20, 2015
Published online: Sep 8, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 8, 2016
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.