Analyses |
 
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Analyses |
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The base node, Node 1, is fixed in all 6 degrees of freedom. Vessel BCs are specified at the uppermost node, Node 507, in DOFs 2, 3, 5, and 6. The initial position of the vessel reference point and the RAOs are also specified.
The only change here is that a vessel offset of 50 ft is applied in the horizontal (DOF 2) direction. The BCs remain unchanged and are carried through automatically from the initial static analysis.
A piecewise-linear current is applied to the riser. The current is ramped on over ten increments. The BCs again remain unchanged and are carried through automatically from the offset analysis.
Once again the BCs remain unchanged and are carried through automatically from the current analysis. Since vessel BCs and RAO data have previously been input, dynamic motions are automatically applied with the onset of wave loading.