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Mathematical Modelling of Wave-Induced Motions and Loads on Moored Offshore Structures
This thesis presents the numerical methods for wave-induced motions and loads on moored offshore structures. The state-of-the-art numerical tools including potential-flow and viscous-flow solvers coupled with mooring dynamics, mechanical connections, and structural dynamics are critically studied and improved. Verification and validation studies are conducted for all applied mathematical models, using available benchmarks and model basin tests. Aiming to account for the nonlinear fluid-structure interaction, mooring dynamics, and associated viscous flow effects, a coupled mooring-viscous flow solver is developed by solving the equations governing mooring dynamics, six-degree-of-freedom nonlinear body motions, and fluid dynamics in a coupled manner. To study an articulated multibody offshore system interacting with its mooring lines, the mooring-viscous flow solver is extended by incorporating a rigid-body-dynamics algorithm, where various mechanical joints can be applied to articulate bodies. The fluid-structure interaction is considered using both a conventional Finite-Volume-Finite-Element (FV-FE) approach and a novel self-contained FV-FV method. Implemented into OpenFOAM as an open source, the developed numerical models show the high potential for analyzing the motions and loads on moored and/or articulated offshore structures in various sea states, which goes beyond the state of the art. ; Im Rahmen dieser Arbeit werden numerische Methoden für welleninduzierte Bewegungen und Lasten auf verankerte Offshore-Strukturen entwickelt und analysiert. Die eingesetzten numerischen Verfahren, einschließlich Lösungsverfahren für potentielle und viskose Strömungen, gekoppelt mit mathematischen Modellen für Verankerungssysteme, mechanischen Verbindungen und Strukturdynamik, werden kritisch analysiert und erweitert. Verifikations- und Validierungsstudien werden für alle eingesetzten mathematischen Modelle durchgeführt, wobei verfügbare Benchmarks und Messungen aus Modellversuchen herangezogen werden. Zur Untersuchung ...
Mathematical Modelling of Wave-Induced Motions and Loads on Moored Offshore Structures
This thesis presents the numerical methods for wave-induced motions and loads on moored offshore structures. The state-of-the-art numerical tools including potential-flow and viscous-flow solvers coupled with mooring dynamics, mechanical connections, and structural dynamics are critically studied and improved. Verification and validation studies are conducted for all applied mathematical models, using available benchmarks and model basin tests. Aiming to account for the nonlinear fluid-structure interaction, mooring dynamics, and associated viscous flow effects, a coupled mooring-viscous flow solver is developed by solving the equations governing mooring dynamics, six-degree-of-freedom nonlinear body motions, and fluid dynamics in a coupled manner. To study an articulated multibody offshore system interacting with its mooring lines, the mooring-viscous flow solver is extended by incorporating a rigid-body-dynamics algorithm, where various mechanical joints can be applied to articulate bodies. The fluid-structure interaction is considered using both a conventional Finite-Volume-Finite-Element (FV-FE) approach and a novel self-contained FV-FV method. Implemented into OpenFOAM as an open source, the developed numerical models show the high potential for analyzing the motions and loads on moored and/or articulated offshore structures in various sea states, which goes beyond the state of the art. ; Im Rahmen dieser Arbeit werden numerische Methoden für welleninduzierte Bewegungen und Lasten auf verankerte Offshore-Strukturen entwickelt und analysiert. Die eingesetzten numerischen Verfahren, einschließlich Lösungsverfahren für potentielle und viskose Strömungen, gekoppelt mit mathematischen Modellen für Verankerungssysteme, mechanischen Verbindungen und Strukturdynamik, werden kritisch analysiert und erweitert. Verifikations- und Validierungsstudien werden für alle eingesetzten mathematischen Modelle durchgeführt, wobei verfügbare Benchmarks und Messungen aus Modellversuchen herangezogen werden. Zur Untersuchung ...
Mathematical Modelling of Wave-Induced Motions and Loads on Moored Offshore Structures
Jiang, Changqing (author) / Moctar, Bettar Ould El
2021-12-17
Theses
Electronic Resource
English
Response Statistics of Moored Offshore Structures
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