The full line is the 'usual' OrcaFlex line, defined by the section lengths and properties specified on the structure page of the line data form. Full line and active lineįollowing the above analogy, we introduce a distinction between the full line and the active line. The inactive line is, for instance, massless – unlike the hose on the drum. Where line feeding departs from the analogy is in the properties of the inactive line, which plays no part in the model whatsoever and effectively does not exist for the purposes of simulation. Line feeding in OrcaFlex is analogous to this flexible hose system, in that it permits the amount of active line to vary during a simulation, up to a maximum length. The line that has been paid out into the water is referred to as active, and that hauled in onto the drum as inactive. If the system were running in reverse, then it would remove the hose from the water and wind it back up around the drum. The drum unwinds the hose at a constant rate, so that the length of hose in the water increases linearly as time progresses. TerminologyĪs a helpful analogy, consider a flexible hose being fed into the water from a rotating drum. Feeding occurs at line ends, and may occur at both ends simultaneously. Line feeding is used to introduce new line, or remove existing line, during an OrcaFlex simulation.
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