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 Zhengqiang Xu and Shan Huang.Numerical Investigation of Mooring Line Damping and the Drag Coefficients of Studless Chain Links[J].Journal of Marine Science and Application,2014,(1):76-84.[doi:1671-9433(2014)01-0076-09]
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Numerical Investigation of Mooring Line Damping and the Drag Coefficients of Studless Chain Links


Numerical Investigation of Mooring Line Damping and the Drag Coefficients of Studless Chain Links
Zhengqiang Xu and Shan Huang
Zhengqiang Xu and Shan Huang
Dept. of Naval Architecture and Marine Engineering, University of Strathclyde, Glasgow, Henry Dyer Building, 100 Montrose Street, Glasgow G4 0LZ1, UK
CFD drag coefficient low frequency motion mooring line damping chain links offshore floating platforms
The chain/wire rope/chain combination is a common choice for mooring offshore floating platforms. However, data of the drag coefficients of chain links are rather limited, resulting in uncertainties with the calculations of the drag force, and hence the damping of the mooring system. In this paper, the importance of the selection of the drag coefficient is first investigated. The computational fluid dynamics (CFD) method is then used to determine the drag coefficients of a studless chain under steady flows. Numerical model validation is first completed by simulating a smooth circular cylinder under steady flows. In particular, the performance of different turbulence models is assessed through the comparisons between the calculations and the experimental results. The large eddy simulation (LES) model is finally selected for the simulation of steady flows past a chain. The effects of the Reynolds number on the drag coefficient of a stud-less chain is also studied. The results show that the calculated drag coefficients of a stud-less chain are fairly consistent with the available experimental data.


Breuer M (1998). Numerical and modeling influences on large eddy simulations for the flow past a circular cylinder. International Journal of Heat and Fluid Flow, 19, 512-521.
Breuer M (1998). Large eddy simulation of the sub-critical flow past a circular cylinder: numerical and modeling aspects. Int. J. Numer. Meth. Fluids, 28, 1281-1302.
Breuer M (2000). A challenging test case for large eddy simulation: high Reynolds number circular cylinder flow. Int’l J. Heat and Fluid Flow, 21, 648-654.
Brown DT, Mavrakos S (1999). Comparative study on mooring line dynamic loading. Marine Structures, 12, 131-151.
Cantwell B, Coles D (1983). An experimental study of entrainment and transport in the turbulent near-wake of a circular cylinder. Journal of Fluid Mechanics, 136, 321-374.
DNV (2010a). DNV Recommended Practice DNV-RP-C205. Environmental Conditions and Environmental Loads.
DNV (2010b). DNV Offshore Standard DNV-OS-E301. Position Mooring.
Franke J, Frank W (2002). Large eddy simulation of the flow past a circular cylinder at Re=3900. Journal of Wind Engineering and Industrial Aerodynamics, 90, 1191-1206, 2002.
Hallam MG, Heaf NJ, Wootton LR (1977). Dynamics of marine structures. Report UR8, CIRIA Underwater Engineering Group, Atkins Research and Development, London.
Huse E, Matsumoto K (1988). Practical estimation of mooring line damping. Offshore Technology Conference, Houston, Texas, USA, 543–552.
Huse E, Matsumoto K (1989). Mooring line damping due to first- and second-order vessel motion. Offshore Technology Conference, OTC6137, Houston, Texas, USA.
Johanning L, Smith GH, Wolfram J (2007). Measurements of static and dynamic mooring line damping and their importance for floating WEC devices. Ocean Engineering, 34, 1918-1934.
Kim SE, Mohan LS (2005). Prediction of unsteady loading on a circular cylinder in high Reynolds number flows using large eddy simulation. Proceedings of OMAE 2005, Halkidiki, Greece, 2005.
Lyons GJ, Brown DT, Lin HM (1997). Drag coefficients for mooring line hydrodynamic damping. Proceedings of the Seventh International Offshore and Polar Engineering Conference, Honolulu, USA, 1997.
Menter FR, Rumsey CL (1994). Assessment of two-equation turbulence models for transonic flows. 25th AIAA Fluid Dynamics Conference, Colorado, AIAA 94–2343, 1994.
Orcina (2011). OrcaFlex User Manual. Version9.5a, Orcina Ltd,.
Ormberg H, Larsen K (1998). Coupled analysis of floater motion and mooring dynamics for a turret-moored ship. Applied Ocean Research, 20, 55-67.
Sarkar A, Taylor RE (2000). Effects of mooring line drag damping on response statistics of vessels excited by first- and second-order wave forces. Ocean Engineering, 27, 667-686.
Scheme G (1983). On the force fluctuations acting on a circular cylinder in cross-flow from subcritical up to transcritical Reynolds numbers. Journal of Fluid Mechanics, 133, 265-285.
Wichers J, Dercksen A (1994). Investigation into scale effects on motions and mooring forces of a turret-moored tanker. Offshore Technology Conference, Houston, Texas, USA.
Webster WC (1995). Mooring-induced damping. Ocean Engineering, 22, 571-591.
Young ME, Ooi A (2007). Comparative assessment of LES and URANS for flow over a cylinder at a Reynolds number of 3900. 16th Australasian Fluid Mechanics Conference, Crown Plaza, Gold Coast, Australia, 2007.
Young WS (2007). Hydrodynamic analysis of mooring lines based on optical tracking experiments. PhD thesis, Texas A&M University, 2007.


Last Update: 2014-11-04