Introduction |
 
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Introduction |
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This example considers a tow-out and installation of a riser bundle. The analysis is performed in two phases. Firstly, a shallow water tow configuration is considered, where the forward tow speed is simulated by an in-line uniform reverse current, and the riser bundle is subjected to regular wave loading. Secondly, a deep water installation procedure is analysed in which the riser bundle is upended from an initial floating configuration into a vertical position.
This example illustrates a number of important modelling features in Flexcom which are useful in this type of analysis. Specifically, the following capabilities are demonstrated:
•Modelling of partial submergence of sections. The buoyancy formulation in Flexcom means that partial submergence of an element cross-section can be accurately modelled. This is particularly useful when, as in this case, elements float on the sea surface.
•Winch element facility. The winch capability previously demonstrated in the SCR Transfer example is used again here in the deep water installation phase of the analysis.
A schematic of the system at the start of the second, deep water phase is shown in the figure below.
Tow-Out Configuration