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OC4 P2 LC2.3 Current only

Platform Surge

Flexcom's surge response shows good agreement with the other software tools. Given that surge motions are dependent on (time-invariant) viscous drag loads, closer agreement might have been expected between all the software tools, as this is quite a simple test case. Differences in mooring line modelling approaches (as mentioned in OC4 P2 LC2.1) may be partially responsible. Note that results from DeepLinesWT (Principia) are based on potential flow theory only, and so are missing the viscous drag terms which are central to this test (see note on DeepLines Wind results in OC4). Note also that results from FAST (NREL) were not found in the IEA Wind Task 30 results library, so we have used results from FAST (Goldwind) instead in this comparison.