Coupled Dynamic Analysis of Platforms, Risers, and Moorings

Chaudhury, Gautam; Ho, Cheng-Yo

doi:10.4043/12084-ms

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…Some researchers investigated the coupling effect of the spar mooring system (Chaudhury 2001;Chaudhury, Ho 2000;Ding et al 2003Ding et al , 2005Garrett 2005;Koo et al 2004;Vazquez-Hernandez et al 2006). Tahar and Kim (2008) developed numerical tool for coupled analysis of deepwater floating platform with polyester mooring lines.…”

Section: Introductionmentioning

confidence: 99%

Non-Linear Dynamic Analysis of Coupled Spar Platform

Jameel

Ahmad

Islam

et al. 2013

Journal of Civil Engineering and Management

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Spar platforms are treated as cost-effective and resourceful type of offshore structure in deep water. With increasing depth there are significant changes in its structural behaviour due to coupling of spar hull-mooring line along with radical influence of mooring line damping. So these phenomena should be precisely counted for accurate motion analysis of spar mooring system. In present study, spar platform are configured as a single fully coupled integrated model in ABAQUS/AQUA. Non-linear dynamic analysis in time domain is performed adopting Newmark-β automatic time incrementation technique. Non-linearities due to geometric, loading and boundary conditions are duly considered. Displacement and rotational responses of spar and mooring tensions are obtained during long-duration storm. spar responses get significantly modified and mean position of oscillations gets shifted after longer wave loading. The surge, heave and pitch responses are predominantly excited respectively. The energy contents of PSDs of these responses reduce considerably after long wave loading. Mooring tension responses are significantly different reflecting the damping effect of mooring lines. The pitch response is fairly sensitive to the wave loading duration. After long duration of storm the wave frequency response increases. However, low frequency and wave frequency responses may simultaneously occur due to synchronising sea states.

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Section: Introductionmentioning

confidence: 99%

Non-Linear Dynamic Analysis of Coupled Spar Platform

Jameel

Ahmad

Islam

et al. 2013

Journal of Civil Engineering and Management

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“…Based on results, it was concluded that the current drag on mooring lines and risers could be significant and should be included in the response predictions. Chaudhury and Ho [90] developed an integrated system of risers, mooring lines, and platform in ABAQUS. The dynamic equilibrium of the Spar system and non-linear soil mooring line interaction were taken into account.…”

Section: Analysis Technique Of Classic Sparmentioning

confidence: 99%

Review of offshore energy in Malaysia and floating Spar platform for sustainable exploration

Islam

Jameel

Jumaat

et al. 2012

Renewable and Sustainable Energy Reviews

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Rapidly rising trends of fuel consumption indicate enormous energy crisis of global proportions in near future. Following the trend, Malaysia's fuel consumption has been increasing by an annual rate of 7.2% since 1990 and has even reached 44.9 Mtoe in 2008. It is forecasted to reach 207.3 Mtoe by the year 2030. Due to serious depletion of reserves in various onshore locations, the exploration process is expanded to offshore deeper waters. Seven sedimentary basins belonging to Malaysia, in South China Sea, show great promise to be excellent sources of hydrocarbons. For deep-sea exploration fixed offshore structures are not feasible. An economical alternative is Spar platforms, which are floating structures ideal for exploration of deep water deposits. In this research, Malaysian experience in offshore hydrocarbon exploration is investigated. Various kinds of operational Spar platforms are censoriously explored and their recent technical developments are reviewed. The study reveals that Malaysia's primary energy requirements were met (in year 2008) with natural gas by 43.4% of the total, crude oil by 38.2%, coal by 15.3% and hydropower by 3.1%; indicating evidently that natural gas and crude oil are still the predominant energy sources. Out of the total energy, around 70% oil and 85% natural gas come from offshore fields. These large figures highlight the necessity to consider economically viable alternatives. Spar platform is an innovative marine structure designed to conduct such deep sea explorations. First commissioned Spar at Kikeh field of Malaysia is testimony to immense potential and possibilities of incorporating Spar platforms in the country's deep reserves for sustainable energy generation. Classic Spar, Truss Spar, Cell Spar and Cell-truss Spar are identified to be well suited for these environments. Since the offshore fields are located at waters with more than 1000 m depth, Spar platforms can be successfully installed at these Malaysian deep water fields.

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Implicit domain decomposition methods for coupled analysis of offshore platforms

Rodrigues

Corrêa

Jacob

2006

Commun. Numer. Meth. Engng.

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SUMMARYThis work presents the implementation of optimized numerical tools for the coupled analysis of floating platforms for offshore oil exploitation. The focus is on time-domain, nonlinear dynamic analysis, considering the coupling between the hydrodynamic behaviour of the hull and the structural behaviour of the mooring lines and risers modelled by finite elements (FEs). Some aspects of the formulation and solution of the large-amplitude equations of motion of the hull of the platform are presented, including a brief description of the hydrodynamic models and calculation of the environmental forces. The main aspects of the formulation for the spatial and time discretization of the structural model for the lines are also discussed. Since coupled analyses may require excessive computational costs, the objective of this work is to present the implementation and application of domain decomposition methods, adapted and specialized for the problem at hand, in order to optimize the efficiency of the computational tool. Two groups of domain decomposition methods are considered: the first is a subcycling technique that takes into account the natural partition that exists between the hull and the lines; the second considers the internal decomposition of the mesh of FEs to represent the mooring lines and risers. The methods are devised having in mind their implementation in computers with parallel architecture. Results of a numerical application are presented in order to assess the performance of the methods.

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Coupled Dynamic Analysis of Platforms, Risers, and Moorings

Cited by 8 publications

References 4 publications

Non-Linear Dynamic Analysis of Coupled Spar Platform

Non-Linear Dynamic Analysis of Coupled Spar Platform

Review of offshore energy in Malaysia and floating Spar platform for sustainable exploration

Implicit domain decomposition methods for coupled analysis of offshore platforms

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