In Sparsim, I need to simulate three line types: (1) conventional high-tension mooring lines; (2) catenary-style risers; (3) constant-tensioned vertical risers. How is this best accomplished?
The mooring lines and catenary-style risers can be simply treated as two conventional mooring line “types”. The constant-tension risers are tricky, especially since they are vertical at the zero-environment equilibrium. It is generally adequate for simulation purposes to lump all the vertical constant-tension risers into a single vertical line, although this is not a requirement. Here is one way these lines can be handled: 1. Specify as many elements as necessary to simulate the weight/unit length distribution along the riser (usually this won’t make any noticeable difference; the only important simulation parameter for these line types is the riser axial tension at the keel entry point). 2. Set the “Mean line profile determined by” on editor page 2 to “line tension” and fill in the line tension arrays for all mooring lines and risers. 3. Make the vertical riser(s) *extremely* compliant (something like 1,000 times as compliant as an “equivalent” wire rope; the actual compliance value i
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