NDLI: Dynamic Behaviour of Compliant Towers in Deep Sea

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Clauss, Gu¨nther F. Lee, June Young
Copyright Year	2003
Abstract	For oil and gas production in deep water (> 500m) compliant structures are designed. By dedicated reduction of stiffness and optimization of mass (including added mass contributions) the fundamental period is tuned to about 30s, which is well above the period range of significant wave energy. This paper presents the results of a comprehensive numerical analysis of the hydroelastic behaviour of compliant towers in deep water, investigating the dynamic response of a flexible structure in a given sea state. The numerical program system is based on ADINA with an integrated hydrodynamic module for wave/structure interaction. Nonlinear effects of viscous forces are considered using Morison’s vector equation. In addition nonlinear characteristics of soil/structure interaction are also included according to API regulations. At first, for verification of the program system, the numerical results of a monotower are compared to analytical solutions obtained by modal analysis of the structure in regular and irregular seas. Based on the validated program a compliant tower installed in 503 m water in the Gulf of Mexico (Baldpate tower) is modeled in 3D, and the characteristic dynamic behavior is evaluated. Finally, the tower is exposed to a real “freak” wave (the 25.6m high New Year Wave which has been registered at the North Sea Draupner platform on January 1, 1995), and the associated loads and motions are evaluated.
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	317
Ending Page	327
Page Count	11
File Format	PDF
ISBN	0791836819
DOI	10.1115/OMAE2003-37173
e-ISBN	079183672X
Volume Number	Volume 1: Offshore Technology; Ocean Space Utilization
Conference Proceedings	ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2003-06-08
Publisher Place	Cancun, Mexico
Access Restriction	Subscribed
Subject Keyword	Water Dynamic response American petroleum institute Regulations Wave energy Seas Modal analysis North sea Waves Optimization Stress Gulf of mexico Numerical analysis Soil Stiffness Flexible structures
Content Type	Text
Resource Type	Article

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