Introduction |
 
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Introduction |
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This example considers the analysis of a drilling riser in 7500 ft of water. Connected mode (including drift-off) and disconnected mode analyses are performed. The loads experienced by the riser include current loading, wave loading due to both regular waves and random seas, and forces induced by vessel motions including vessel offsets and the first and second order vessel response to waves.
This example illustrates a number of important modelling features in Flexcom. Specifically, the following capabilities are demonstrated:
•Modelling of soil structure interaction defined in terms of P-y curves.
•Modelling of complex riser tensioning system.
•Simulation of vessel drift-off via the inclusion of an explicitly modelled moored vessel in an analysis.
•Simulation of an emergency-disconnect scenario and subsequent riser recoil.
•Performing dynamic analyses in the frequency domain, and comparing results with corresponding time domain dynamic analyses.
•Performing a modal analysis using Modes to calculate the natural frequencies and mode shapes of a top tensioned riser.
•Performing a time domain fatigue analysis using LifeTime to estimate fatigue damage and predict fatigue life.
•Performing a frequency domain fatigue analysis using LifeFrequency to estimate fatigue damage and predict fatigue life.
A schematic of the riser stack-up is shown in the Riser Stack-Up Schematic figure.