NDLI: Experimental and Numerical Study on Large Truncation of Deepwater Mooring Line

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Su, Yihua Yang, Jianmin Xiao, Longfei Chen, Gang
Copyright Year	2009
Abstract	Modeling the deepwater mooring system in present available basin using standard Froude scaling at an acceptable scale presents new challenges. A prospective method is to truncate the full-depth mooring lines and find an equivalent truncated mooring system that can reproduce both static and dynamic response of the full-depth mooring system, but large truncation arise if the water depth where the deepwater platform located is very deep or the available water depth of the basin is shallow. A Cell-Truss Spar operated in 1500m water depth is calibrated in a wave basin with 4m water depth. Large truncation arises even though a small model scale 1:100 is chosen. A series of truncated mooring lines are designed and investigated through numerical simulations, single line model tests and coupled wave basin model tests. It is found that dynamic response of the truncated mooring line can be enlarged by using larger diameter and mass per unit length in air. Although the truncated mooring line with clump presents a “taut” shape, its dynamic characteristics is dominated by the geometry stiffness and it underestimates dynamic response of the full-depth mooring line, even induces high-frequency dynamic response. There are still two obstacles in realizing dynamic similarity for the largely truncated mooring system: lower mean value of the top tension of upstream mooring lines, and smaller low-frequency mooring-induced damping.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	201
Ending Page	212
Page Count	12
File Format	PDF
ISBN	9780791843413
DOI	10.1115/OMAE2009-79218
e-ISBN	9780791838440
Volume Number	Volume 1: Offshore Technology
Conference Proceedings	ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2009-05-31
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Dynamic response Water Damping Computer simulation Mooring Waves Modeling Spar platforms Geometry Stiffness Tension Shapes Trusses (building) Wing spars
Content Type	Text
Resource Type	Article

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