This paper explores the impact of friction models on mooring line simulations. Seabed friction can play an important role in the determination of mooring loads of slack-moored floating offshore wind turbines. Most mooring models include a relatively simple seabed friction formulation, if any, and little examination of their accuracy is available in literature. Current implementations typically represent seabed contact as coulombic friction with ramping near zero velocity to mitigate instability in the numerical time integration. To assess the impact of this friction model’s use, we compare it against a more sophisticated friction model. This model differentiates between static and kinetic friction, where the former is dependent upon the forces acting on the line and the latter is a function of seabed’s normal response. Both friction models have been implemented into the MoorDyn mooring dynamics simulator and tested under a set of prescribed scenarios including snap loads and oscillatory motion, where the fairlead of a mooring line was driven along both linear and circular paths. Additionally, coupled floating wind turbine simulations using the OC4-DeepCwind semisubmersible show how the friction models affect the platform global response and the extreme and fatigue mooring loads. The results highlight practical differences between the models in terms of both loads prediction and simulation stability/consistency.
Skip Nav Destination
ASME 2018 1st International Offshore Wind Technical Conference
November 4–7, 2018
San Francisco, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5197-5
PROCEEDINGS PAPER
Comparison of Seabed Friction Formulations in a Lumped-Mass Mooring Model Available to Purchase
Kellen Devries,
Kellen Devries
University of Prince Edward Island, Charlottetown, PE, Canada
Search for other works by this author on:
Matthew Hall
Matthew Hall
University of Prince Edward Island, Charlottetown, PE, Canada
Search for other works by this author on:
Kellen Devries
University of Prince Edward Island, Charlottetown, PE, Canada
Matthew Hall
University of Prince Edward Island, Charlottetown, PE, Canada
Paper No:
IOWTC2018-1099, V001T01A025; 8 pages
Published Online:
December 13, 2018
Citation
Devries, K, & Hall, M. "Comparison of Seabed Friction Formulations in a Lumped-Mass Mooring Model." Proceedings of the ASME 2018 1st International Offshore Wind Technical Conference. ASME 2018 1st International Offshore Wind Technical Conference. San Francisco, California, USA. November 4–7, 2018. V001T01A025. ASME. https://doi.org/10.1115/IOWTC2018-1099
Download citation file:
54
Views
Related Proceedings Papers
Related Articles
Hydrodynamic Responses of a Moored Semi-submersible Floating Offshore Wind Turbine in Steep Waves
J. Offshore Mech. Arct. Eng (January,0001)
Alternative Mooring Systems for a Very Large Offshore Wind Turbine Supported by a Semisubmersible Floating Platform
J. Sol. Energy Eng (October,2018)
Power Optimization of Model-Scale Floating Wind Turbines Using Real-Time Hybrid Testing With Autonomous Actuation and Control
J. Offshore Mech. Arct. Eng (June,2019)
Related Chapters
Life Extension of Mooring Chains - Including Effects of Mean Load and Corrosion Condition to Fatigue Capacity
Ageing and Life Extension of Offshore Facilities
Theoretical Analysis of Sliding Friction Contact between Friction Lining and Wire Rope
International Conference on Mechanical and Electrical Technology 2009 (ICMET 2009)
Fatigue Analysis in the Connecting Rod of MF285 Tractor by Finite Element Method
International Conference on Advanced Computer Theory and Engineering, 4th (ICACTE 2011)