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Summary of Vessel Motion Options

To summarise the above, the specification of vessel motion data in Flexcom falls into seven categories or headings, many of which are optional. These are:

(i)Vessel initial position

(ii)Static vessel offset

(iii)Constant forward vessel velocity

(iv)RAO data

(v)Drift data, whether sinusoidal or timetrace

(vi)Combined motion timetrace

(vii)Large or small angles formulation

It must be noted that not all of inputs (i) to (vi) in this list can be used in the same analysis. For example, if you invoke the combined motion timetrace option, then by definition you cannot also specify RAO data or drift data. In practice, options can be specified in only one of two possible combinations, which are defined as follows – the use of the [ ] brackets indicate a particular option is optional.

Combination 1:        Vessel initial position [+ static offset] [+ constant velocity] [+ drift]

                                [+ RAOs]

Combination 2:        Vessel initial position [+ static offset] [+ combined motion timetrace]