Water-on-deck effects on roll motions of an offshore supply vessel in regular stern quartering waves

Abstract

The applicability of the second generation intact stability criteria for preventing pure loss of stability in astern waves to offshore supply vessels (OSV) is investigated. OSVs show an inconsistency problem in the first and second level criteria. Thus, free-running model experiments of an OSV by changing its length of low weather deck in regular stern quartering waves were conducted and were compared with numerical simulation used for pure loss of stability so far. As a result, it was confirmed that the effects of water on deck (WOD) on the behaviour of the OSV could prevent the occurrence of typical pure loss of stability for the cases of long low weather deck. One of WOD's effects is the increase of roll damping and the other is the loss of static stability.