Disconnected Mode |
 
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Disconnected Mode |
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In this case the base of the riser is free in all DOFs. Vessel boundary conditions are specified in all 6 degrees of freedom at the top of the upper flex joint. The initial position of the vessel reference point and the RAO file name are again specified.
A piecewise-linear current is included in this analysis. All boundary conditions remain unchanged and are carried through automatically from the initial static analysis.
No specification of boundary conditions is required either in the disconnected mode dynamic analysis, which is a regular wave run. All of the boundary condition data carries through from the current analysis. Since vessel boundary conditions and RAO data have been specified previously, dynamic motions are automatically applied with the onset of wave loading.
Similar to the time domain, no specification of boundary conditions is required in the frequency domain dynamic analysis. All of the boundary condition data carries through from the current analysis.