100s) that incorporates the expected worst-case loading during a 3-hour simulation at the point of interest on the vessel, such as crane tip or tensioner exit.Ī short simulation can be defined by the largest rise/ fall of a wave or extreme vessel resp onse (max/min heave, velocity or acceleration). Therefore, it is common practice to analyse a short simulation period (e.g. However, this is very computationally expensive to perform due to the large quantity of load cases required. For irregular wave analysis, DNVGL-RP-N103 recommends performing a 3-hour simulation to ensure adequate statistics. Time-domain irregular wave dynamic analysis is performed using OrcaFlex as this is representative of a real sea state as opposed to regular wave. Therefore, it is important to select the correct analysis method to obtain the most accurate results. When installing subsea structures and pipelines, the ability to capture the worst case loading and limiting sea states during the installation analysis can improve safety offshore and l ower the operational risks.
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