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Abstract: Slug flows are extremely interesting multiphase regime phenomena whichfrequently occur in flexible marine risers used by the petroleum industry inoffshore environments and have both a liquid and gaseous phase. This paperdescribes two simple models of the slug flow regime by means of an equivalentmonophase flow with a non-constant density. The slug regime is modelled as amonophase density-varying flow with a sinusoidal density, travelling along thepipe itself towards the top end node of the riser. Starting from the bottomend, it is characterized by adiabatic processes and energy loss along theentire length of the pipe. In the first model, the slug wavelength is supposedto be independent of the riser inclination, while in the second one a simplelinear relationship between the slug wavelength and the pipe inclination wasimposed. The global equation of the motion of the riser written in atwo-dimensional domain throughout the plane containing the riser was solvedusing a Matlab code in the time domain. In particular, the axial tensile force,the bending moment, the viscous structural damping, the wave-induced forces andthe riser-seabed interaction are all modelled here. This work presents acomparison between the two models in two main kinds of configuration a verylong riser with and without seabed presence and it allows the authors to makesome considerations on general pipe behaviour.



Autor: A. Pollio, M. Mossa

Fuente: https://arxiv.org/



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