The Experts below are selected from a list of 336 Experts worldwide ranked by ideXlab platform
Bertrand Vignaud - One of the best experts on this subject based on the ideXlab platform.
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HYDRODYNAMIC LOADING ON MID WATER ARCH STRUCTURES
2015Co-Authors: Colin Russell, Bertrand VignaudAbstract:In the design and analysis of subsea structures, the hydrodynamic coefficients play a significant role in determining the behaviour of the system, particularly when they are under the combined action of steady and oscillatory flow. For small regularly shaped structures and slender members there is a significant amount of literature that provides assistance in the selection of suitable values, however this is not the case for larger and irregular shaped structures where there is a scarcity of information. This paper details the results of a study to develop techniques to derive hydrodynamic coefficients for representative mid water arch configurations commonly used in shallow water flexible Riser system applications. The results of a literature review are presented outlining where these structures fit into the different theoretical models. The use of the potential flow approach is verified by means of computational fluid dynamic simulations for a representative structure and both methods are utilised to assist in the generation of appropriate coefficients. A case study on a typical shallow water North Sea project is presented that demonstrates the importance of selecting appropriate hydrodynamic values to represent the structure. The influence of each of the coefficients on the arch motion, which has an impact on the Riser response, is studied. It is shown that it is not always possible to be conservative and instead it is important to select appropriate coefficients for the structure in question, which may differ from those typically used. The method developed has wide ranging applicability and can in principle be applied to the determination of hydrodynamic coefficients for other large structures subject to hydrodynamic loading, including disconnectable turret buoys and Hybrid Riser tower systems
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hydrodynamic loading on mid water arch structures
ASME 2011 30th International Conference on Ocean Offshore and Arctic Engineering, 2011Co-Authors: Colin Russell, Bertrand VignaudAbstract:In the design and analysis of subsea structures, the hydrodynamic coefficients play a significant role in determining the behaviour of the system, particularly when they are under the combined action of steady and oscillatory flow. For small regularly shaped structures and slender members there is a significant amount of literature that provides assistance in the selection of suitable values, however this is not the case for larger and irregular shaped structures where there is a scarcity of information. This paper details the results of a study to develop techniques to derive hydrodynamic coefficients for representative mid water arch configurations commonly used in shallow water flexible Riser system applications. The results of a literature review are presented outlining where these structures fit into the different theoretical models. The use of the potential flow approach is verified by means of computational fluid dynamic simulations for a representative structure and both methods are utilised to assist in the generation of appropriate coefficients. A case study on a typical shallow water North Sea project is presented that demonstrates the importance of selecting appropriate hydrodynamic values to represent the structure. The influence of each of the coefficients on the arch motion, which has an impact on the Riser response, is studied. It is shown that it is not always possible to be conservative and instead it is important to select appropriate coefficients for the structure in question, which may differ from those typically used. The method developed has wide ranging applicability and can in principle be applied to the determination of hydrodynamic coefficients for other large structures subject to hydrodynamic loading, including disconnectable turret buoys and Hybrid Riser tower systems.Copyright © 2011 by ASME
Colin Russell - One of the best experts on this subject based on the ideXlab platform.
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HYDRODYNAMIC LOADING ON MID WATER ARCH STRUCTURES
2015Co-Authors: Colin Russell, Bertrand VignaudAbstract:In the design and analysis of subsea structures, the hydrodynamic coefficients play a significant role in determining the behaviour of the system, particularly when they are under the combined action of steady and oscillatory flow. For small regularly shaped structures and slender members there is a significant amount of literature that provides assistance in the selection of suitable values, however this is not the case for larger and irregular shaped structures where there is a scarcity of information. This paper details the results of a study to develop techniques to derive hydrodynamic coefficients for representative mid water arch configurations commonly used in shallow water flexible Riser system applications. The results of a literature review are presented outlining where these structures fit into the different theoretical models. The use of the potential flow approach is verified by means of computational fluid dynamic simulations for a representative structure and both methods are utilised to assist in the generation of appropriate coefficients. A case study on a typical shallow water North Sea project is presented that demonstrates the importance of selecting appropriate hydrodynamic values to represent the structure. The influence of each of the coefficients on the arch motion, which has an impact on the Riser response, is studied. It is shown that it is not always possible to be conservative and instead it is important to select appropriate coefficients for the structure in question, which may differ from those typically used. The method developed has wide ranging applicability and can in principle be applied to the determination of hydrodynamic coefficients for other large structures subject to hydrodynamic loading, including disconnectable turret buoys and Hybrid Riser tower systems
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hydrodynamic loading on mid water arch structures
ASME 2011 30th International Conference on Ocean Offshore and Arctic Engineering, 2011Co-Authors: Colin Russell, Bertrand VignaudAbstract:In the design and analysis of subsea structures, the hydrodynamic coefficients play a significant role in determining the behaviour of the system, particularly when they are under the combined action of steady and oscillatory flow. For small regularly shaped structures and slender members there is a significant amount of literature that provides assistance in the selection of suitable values, however this is not the case for larger and irregular shaped structures where there is a scarcity of information. This paper details the results of a study to develop techniques to derive hydrodynamic coefficients for representative mid water arch configurations commonly used in shallow water flexible Riser system applications. The results of a literature review are presented outlining where these structures fit into the different theoretical models. The use of the potential flow approach is verified by means of computational fluid dynamic simulations for a representative structure and both methods are utilised to assist in the generation of appropriate coefficients. A case study on a typical shallow water North Sea project is presented that demonstrates the importance of selecting appropriate hydrodynamic values to represent the structure. The influence of each of the coefficients on the arch motion, which has an impact on the Riser response, is studied. It is shown that it is not always possible to be conservative and instead it is important to select appropriate coefficients for the structure in question, which may differ from those typically used. The method developed has wide ranging applicability and can in principle be applied to the determination of hydrodynamic coefficients for other large structures subject to hydrodynamic loading, including disconnectable turret buoys and Hybrid Riser tower systems.Copyright © 2011 by ASME
David Champi Farfan - One of the best experts on this subject based on the ideXlab platform.
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Estudo do comportamento estatico e dinamico de um Riser vertical co boia de subsuperficie
2014Co-Authors: David Champi FarfanAbstract:Resumo: Na atualidade as descobertas de óleo a grandes profundidades no mar têm levado ao desenvolvimento de campos localizados numa profundidade aproximada de 3000m, sendo então o sistema de Riser Híbrido Auto-Sustentável uma alternativa atraente. Opresente trabalho apresenta os modelos matemáticos que descrevem o comportamento estático e dinâmico de um Riser vertical com bóia de sub-superfície nas direções in-line, que é a direção da onda e correnteza no mar, e a direção transversal, perpendicular àdireção in-line. Apresentam-se também simulações numéricas em diferentes condições de onda e correnteza e o seu efeito combinado, assim como o estudo paramétrico para as principais variáveis que influenciam no comportamento dinâmico e estáticoAbstract: Nowadays, the oil discoveries at big depths in the sea have taken to the development of fields located in an approach depth of 3000m, being the Self Standing Hybrid Riser an attractive alternative. The present work presents the mathematical models that describe the static and dynamic behavior of a Vertical Riser with a subsurface buoy in the directions inline, that it is the direction of the wave and currents in the sea, and the transversal, that is perpendicular to the in-line direction. Numerical simulations in different conditions of wave and currents are also presented and its combined effect is studied, as well as the parametric study for the main variable that influences its dynamic and static behavio
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Estudo do comportamento estatico e dinamico de um Riser vertical co boia de subsuperficie
Universidade Estadual de Campinas. Faculdade de Engenharia Mecânica e Instituto de Geociências, 2005Co-Authors: David Champi FarfanAbstract:Na atualidade as descobertas de óleo a grandes profundidades no mar têm levado ao desenvolvimento de campos localizados numa profundidade aproximada de 3000m, sendo então o sistema de Riser Híbrido Auto-Sustentável uma alternativa atraente. O presente trabalho apresenta os modelos matemáticos que descrevem o comportamento estático e dinâmico de um Riser vertical com bóia de sub-superfície nas direções in-line, que é a direção da onda e correnteza no mar, e a direção transversal, perpendicular à direção in-line. Apresentam-se também simulações numéricas em diferentes condições de onda e correnteza e o seu efeito combinado, assim como o estudo paramétrico para as principais variáveis que influenciam no comportamento dinâmico e estáticoNowadays, the oil discoveries at big depths in the sea have taken to the development of fields located in an approach depth of 3000m, being the Self Standing Hybrid Riser an attractive alternative. The present work presents the mathematical models that describe the static and dynamic behavior of a Vertical Riser with a subsurface buoy in the directions inline, that it is the direction of the wave and currents in the sea, and the transversal, that is perpendicular to the in-line direction. Numerical simulations in different conditions of wave and currents are also presented and its combined effect is studied, as well as the parametric study for the main variable that influences its dynamic and static behavio
Asundi, Anand Krishna - One of the best experts on this subject based on the ideXlab platform.
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Failure assessment of aluminum liner based filament-wound Hybrid Riser subjected to internal hydrostatic pressure
'SPIE-Intl Soc Optical Eng', 2015Co-Authors: Dikshit Vishwesh, Seng, Ong Lin, Maheshwari Muneesh, Asundi, Anand KrishnaAbstract:The present study describes the burst behavior of aluminum liner based prototype filament-wound Hybrid Riser under internal hydrostatic pressure. The main objective of present study is to developed an internal pressure test rig set-up for filament-wound Hybrid Riser and investigate the failure modes of filament-wound Hybrid Riser under internal hydrostatic burst pressure loading. The prototype filament-wound Hybrid Riser used for burst test consists of an internal aluminum liner and outer composite layer. The carbon-epoxy composites as part of the filament-wound Hybrid Risers were manufactured with [±55o] lay-up pattern with total composite layer thickness of 1.6 mm using a CNC filament-winding machine. The burst test was monitored by video camera which helps to analyze the failure mechanism of the fractured filament-wound Hybrid Riser. The Fiber Bragg Grating (FBG) sensor was used to monitor and record the strain changes during burst test of prototype filament-wound Hybrid Riser. This study shows good improvements in burst strength of filament-wound Hybrid Riser compared to the monolithic metallic Riser. Since, strain measurement using FBG sensors has been testified as a reliable method, we aim to further understand in detail using this technique.Published versio
Anand Asundi - One of the best experts on this subject based on the ideXlab platform.
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failure assessment of aluminum liner based filament wound Hybrid Riser subjected to internal hydrostatic pressure
International Conference on Experimental Mechanics 2014, 2015Co-Authors: Vishwesh Dikshit, Ong Lin Seng, Muneesh Maheshwari, Anand AsundiAbstract:The present study describes the burst behavior of aluminum liner based prototype filament-wound Hybrid Riser under internal hydrostatic pressure. The main objective of present study is to developed an internal pressure test rig set-up for filament-wound Hybrid Riser and investigate the failure modes of filament-wound Hybrid Riser under internal hydrostatic burst pressure loading. The prototype filament-wound Hybrid Riser used for burst test consists of an internal aluminum liner and outer composite layer. The carbon-epoxy composites as part of the filament-wound Hybrid Risers were manufactured with [±55o] lay-up pattern with total composite layer thickness of 1.6 mm using a CNC filament-winding machine. The burst test was monitored by video camera which helps to analyze the failure mechanism of the fractured filament-wound Hybrid Riser. The Fiber Bragg Grating (FBG) sensor was used to monitor and record the strain changes during burst test of prototype filament-wound Hybrid Riser. This study shows good improvements in burst strength of filament-wound Hybrid Riser compared to the monolithic metallic Riser. Since, strain measurement using FBG sensors has been testified as a reliable method, we aim to further understand in detail using this technique.
