From the experimental observations, the following conclusions can be derived:1. At the lower Froude number, the maximum roll angle is very high due to the large heeling moment caused by the significant amount of water trapped on one side of the weather deck.2. When the speed of the vessel increases, the maximum roll angle decreases due to the combined effect of reduced water ingress and roll damping due to trapped water. The damping effect becomes highest for this vessel around the Froude number of 0.31.3. When the Froude number exceeds 0.31, the maximum roll angle again starts to increase due to the yaw-roll coupling and decrease of roll damping.The present conclusions agree with the assumptions made in the previous researches 1) 2) and this year, the presence and variation of damping effect due to water on deck was directly verified by monitoring the water motion on the weather deck. The trapped water can induce both static and dynamic moments, depending on the speed of the vessel.The novel approach of a systematic division of the water on deck effect into isolated sub-phenomena would aid in, faster development of numerical code and easier debugging of errors.
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