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Full-Scale Verification of the Hydrodynamic Motions of a Floating Facility

Authors
M. Zed (Woodside Energy Limited) | I. A. Milne (The University of Western Australia)
DOI
https://doi.org/10.4043/28479-MS
Document ID
OTC-28479-MS
Publisher
Offshore Technology Conference
Source
Offshore Technology Conference Asia, 20-23 March, Kuala Lumpur, Malaysia
Publication Date
2018
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-552-5
Copyright
2018. Offshore Technology Conference
Disciplines
1.1 Well Planning, 1.1 Well Planning, 1.6 Drilling Operations
Keywords
wave structure interaction, vessel response, metocean, hydrodyanmics, wave spectra
Downloads
2 in the last 30 days
109 since 2007
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Abstract

Quantifying the hydrodynamic motions of a floating facility is critical for ensuring its safe and efficient operation. The ability to obtain estimates of the motion response charactersitics using a numerical approach to estimate the seastate is particulary attractive for sites in which limited observational wave data are available. Validation of such a numerial approach using full-scale data is however, desirable in order to establish its accuracy and limitations. To this end, this paper presents a case study where numerical estimates of the dynamic motions of a drillship were validated using high quality dynamic motion records acquired during the drilling campaign. The model comprises a hindcast of the directional wave spectra and numerically derived hydrodynamic response characteristics of the ship. The performance of the model is evaluated using a range of selected seastates which were observed during the drilling campaign. It is demonstrated that reliable estimates of the motions of most interest for a drilling operation can generally be obtained, thus providing support to the use of the provided numerical approach for conducting operability assessments for floating facility planning purposes.

File Size  1 MBNumber of Pages   11

Ardhuin, F., W. E. Rogers, A. V. Babanin, J.-F. Filipot, R. Magne, A. Roland, A. van der Westhuysen, P. Queffeulou, B. Lee, L. Aouf, and F. Collard 2010, Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation, Journal of Physical Oceanography, 40(9), 1917–1941, doi:10.1175/2010JPO4324.1.

Chakrabarti, S.K. 1987. Hydrodynamics of offshore structures. Computational Mechanics, Southampton.

Milne, I.A., S. Delaux, P. McComb 2016. Validation of a predictive tool for the heading of turret-moored vessels, Ocean Engineering, 128, 2016, 22–40, doi:10.1016/j.oceaneng.2016.10.007.

Milne, I.A. and Zed, M. 2018. Deriving directional wave spectra from ship motions. Proceedings of OTC Asia, Kuala Lumpur, Malaysia.

Newman, J.N. and Lee, C-H. (2018) WAMIT; a radiation-diffraction panel program for wave-body interactions. http://www.wamit.com. Accessed 16 Jan 2018

Saha, S., S. Moorthi, X. Wu, J. Wang, S. Nadiga, P. Tripp, D. Behringer, Y. T. Hou, H. Y. Chuang, M. Iredell, M. Ek, J. Meng, R. Yang, M. P. Mendez, H. Van Den Dool, Q. Zhang, W. Wang, M. Chen, and E. Becker. 2014, The NCEP climate forecast system version 2, Journal of Climate, 27(6), 2185–2208, doi:10.1175/JCLI-D-12-00823.1.

Tolman, H.L. 2014. User manual and system documentation of WAVEWATCH III version 4.18.

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