Coupled Analysis |
 
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Coupled Analysis |
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A coupled analysis is a specialized type of analysis in which the vessel (or more correctly referred to as the floating body) is explicitly included in the model. It might typically be used in the analysis of relatively small offshore structure such as CALM buoys, where the motions of the body are heavily influenced by the lines which are attached to it. The inertia of vessels such as FPSOs is sufficiently large such that the vessel motions are independent of the presence of the attached risers. In traditional (decoupled) analysis the vessel motions are prescribed via (displacement) RAOs which are known beforehand. In a coupled analysis, various first and second order forces are applied to the vessel, and the solution is essentially the vessel response.
Further information on this topic is contained in the following sections:
•Evolution of Flexcom Capabilities outlines the main options available in Flexcom, beginning with the earlier “CALM Buoy” and “Moored Vessel” facilities, and describes the additional modelling complexity afforded by the more recent “Floating Body” capability.
•CALM Buoy provides a general overview of the CALM buoy analysis capability.
•Moored Vessel provides a general overview of the moored vessel analysis capability.
•Floating Body provides a general overview of the floating body analysis capability.
•*CALM MODEL is used to specify the properties of calm buoys.
•*MOORED VESSEL is used to define a moored vessel and its associated properties.
•*FLOATING BODY is used to define a floating body and its associated properties.