Component Approach for Confident Predictions of Deepwater CALM Buoy Coupled Motions: Part 1 — Philosophy

Huang, Zhenjia; Santala, Markku; Wang, Hui; Yung, T. W.; Kan, Wan C.; Sandstrom, Robert E.

doi:10.1115/omae2005-67138

Cited by 4 publications

(3 citation statements)

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“…In such instance, their contribution to total drag is included in the drag loads on the skirt in the study presented here, which could lead to an overestimation of the CD values. Recent applications have been conducted by coupling CALM buoy models using related hydrodynamic formulations in literature [78][79][80][81]. .…”

Section: Results Of Viscous Dampingmentioning

confidence: 99%

An Investigation on the Vortex Effect of a CALM Buoy under Water Waves Using Computational Fluid Dynamics (CFD)

Amaechi

2022

Inventions

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Floating offshore structures (FOS) must be designed to be stable, to float, and to be able to support other structures for which they were designed. These FOS are needed for different transfer operations in oil terminals. However, water waves affect the motion response of floating buoys. Under normal sea states, the free-floating buoy presents stable periodic responses. However, when moored, they are kept in position. Mooring configurations used to moor buoys in single point mooring (SPM) terminals could require systems such as Catenary Anchor Leg Moorings (CALM) and Single Anchor Leg Moorings (SALM). The CALM buoys are one of the most commonly-utilised type of offshore loading terminal. Due to the wider application of CALM buoy systems, it is necessary to investigate the fluid structure interaction (FSI) and vortex effect on the buoy. In this study, a numerical investigation is presented on a CALM buoy model conducted using Computational Fluid Dynamics (CFD) in ANSYS Fluent version R2 2020. Some hydrodynamic definitions and governing equations were presented to introduce the model. The results presented visualize and evaluate specific motion characteristics of the CALM buoy with emphasis on the vortex effect. The results of the CFD study present a better understanding of the hydrodynamic parameters, reaction characteristics and fluid-structure interaction under random waves.

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Section: Results Of Viscous Dampingmentioning

confidence: 99%

An Investigation on the Vortex Effect of a CALM Buoy under Water Waves Using Computational Fluid Dynamics (CFD)

Amaechi

2022

Inventions

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“…[4], [5] and [6]) and AGBAMI projects. The AKPO project will offer a new opportunity to refine the conclusions.…”

Section: (See Ref [3])mentioning

confidence: 99%

Deepwater Oil Export Systems: Past, Present, and Future

Blanc¹,

Isnard²,

Smith³

2006

Offshore Technology Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractTo date, nine deepwater export systems have been installed by Oil Companies, or are under construction. The first deepwater export system, on the GIRASSOL field (Angola), was installed in 2001. Since then, a further three systems are now in place, one on the BONGA field (Nigeria) and two on the KIZOMBA field (Angola). A further five are under design or construction (ERHA, DALIA, GREATER PLUTONIO, AGBAMI and AKPO).All these export systems are based on the concept of a large surface buoy, shaped, in most cases, like a flat cylinder. These buoys are anchored to the sea bed by an array of semi-taut composite anchor lines and support several -generally twomid-water export lines.Although these systems show clear differences in anchor line arrangement and composition, and also in export line diameter and configuration, they indicate that the design of deep water export systems has reached maturity.In its first part, the paper gives a general outline description of the nine export systems mentioned above. It explains what the key design drivers are and describes the design process, addressing successively the following issues:a. derivation of mooring force and definition of the anchoring system; b. buoyancy requirements and hydrostatic stability; c. coupled motion response in waves; d. fatigue in anchor lines and export lines.In the second part, the paper highlights the major limitations of the present systems. It describes the various concepts recently developed in the Industry and discusses their relative merits and drawbacks.In conclusion the paper will propose a way forward, facing the challenge of deeper water and harsher environments.

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“…Thus, having mathematical models for bonded marine hoses on CALM buoys and SPM systems is obviously a requisite for the techno-economic design and operation of these floating structures. Recent innovations in bonded marine hoses include the application of composite materials [8][9][10][11], in composite marine risers [11][12][13][14][15][16][17][18][19], in moored offloading systems with coupled analysis [20][21][22][23][24][25][26][27], and the supporting CALM buoy systems [28][29][30][31][32][33][34][35]. However, these structures, similar to moorings, all depend on existing marine structures such as WECs, breakwater devices, tidal turbines, offshore wind turbines or CALM buoys [36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling of Bonded Marine Hoses for Single Point Mooring (SPM) Systems, with Catenary Anchor Leg Mooring (CALM) Buoy Application—A Review

Amaechi

Wang

2021

JMSE

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The application of mathematical analysis has been an essential tool applied on Catenary Anchor Leg Mooring (CALM) buoys, Wave Energy Converters (WEC), point absorber buoys, and various single point mooring (SPM) systems. This enables having mathematical models for bonded marine hoses on SPM systems with application with CALM buoys, which are obviously a requisite for the techno-economic design and operation of these floating structures. Hose models (HM) and mooring models (MM) are utilized on a variety of applications such as SPARs, Semisubmersibles, WECs and CALM buoys. CALM buoys are an application of SPM systems. The goal of this review is to address the subject of marine hoses from mathematical modeling and operational views. To correctly reproduce the behavior of bonded marine hoses, including nonlinear dynamics, and to study their performance, accurate mathematical models are required. The paper gives an overview of the statics and dynamics of offshore/marine hoses. The reviews on marine hose behavior are conducted based on theoretical, numerical, and experimental investigations. The review also covers challenges encountered in hose installation, connection, and hang-off operations. State-of-the-art, developments and recent innovations in mooring applications for SURP (subsea umbilicals, risers, and pipelines) are presented. Finally, this study details the relevant materials that are utilized in hoses and mooring implementations. Some conclusions and recommendations are presented based on this review.

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Component Approach for Confident Predictions of Deepwater CALM Buoy Coupled Motions: Part 1 — Philosophy

Cited by 4 publications

References 0 publications

An Investigation on the Vortex Effect of a CALM Buoy under Water Waves Using Computational Fluid Dynamics (CFD)

An Investigation on the Vortex Effect of a CALM Buoy under Water Waves Using Computational Fluid Dynamics (CFD)

Deepwater Oil Export Systems: Past, Present, and Future

Mathematical Modelling of Bonded Marine Hoses for Single Point Mooring (SPM) Systems, with Catenary Anchor Leg Mooring (CALM) Buoy Application—A Review

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