Trans RINA, Vol 154, Part A2, Intl J Maritime Eng, Apr-Jun 2012


The water levels in the lower tank on the starboard side (0Fwd-S06) are plotted as functions of time in Figure 4. As can be seen, there are two distinctly different patterns: one where the water level increases


slowly and


consistently; and one where the water level increases rapidly to begin with, and then levels out. In each case the tank was full at the end of the run (the slight differences in equilibrium water level are within the expected level of uncertainty).


Figure 2a Cross-section AA


It was observed that for the cases where the water level increased rapidly, a vortex was formed in the water on the 2nd deck above. This meant that air escaping from this compartment had a direct path to the atmosphere. On the other hand, for the runs where the water level filled more slowly such a vortex did not appear, and consequently the air could only escape from


this Figure 2b Cross-section BB


compartment more slowly as a series of bubbles. This was visible within the footage from the internal video camera. It is unknown as to what triggered this vortex to occur during some runs and not in others.


Note that the area of the damage opening varied between the four runs shown in Figure 4, however it is assumed that this had little effect on the rate at which tank 0Fwd- S06 filled due to its location and because it filled through a down flooding hatch.


Figure 2c Cross-section CC Water Levels Run P1_R26 70 60 50


Water Level 0Fwd-S06 Water Level 2Centre-S12 Water Level 2Centre-S15 Water Level 2Aft-S11


40


30


20


10


0


-10 -10 0 10 20 Time (s) Figure 3 Water levels in compartments as a function of time 30 40 50


A-56


©2012: The Royal Institution of Naval Architects


Water Level (mm)


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