This paper presents an investigation of the still water sink trajectories of an accidentally dropped Christmas Tree (XT). A 3D coupled nonlinear dynamics/hydrodynamics model of the XT is constructed and simulations executed from surface to seabed. XT initial water entry orientations are randomly varied in a Monte-Carlo simulation to predict the seabed impact zone. Still water simulation results are compared to simplified cone-angle type method predictions. The effect of XT flat panels on excursion mitigation is investigated. Finally, the influence of non-uniform current effects is studied.
Nonlinear Drop Simulations of a Christmas Tree in Deep Waters
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Majed, A, & Cooper, P. "Nonlinear Drop Simulations of a Christmas Tree in Deep Waters." Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. Volume 1B: Offshore Technology. San Francisco, California, USA. June 8–13, 2014. V01BT01A022. ASME. https://doi.org/10.1115/OMAE2014-24284
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