Trans RINA, Vol 154, Part A2, Intl J Maritime Eng, Apr-Jun 2012 Water Level 0Fwd-S06 70 Model Fully Constrained 60
Fixed Heel Angle = 0 degrees Fixed Trim Angle = 0 degrees Calm Water
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10 0
Water Level Damage Opening 50% (Run P1_R21) Water Level Damage Opening 85% (Run P1_R22) Water Level Damage Opening 85% (Run P1_R23) Water Level Damage Opening 100% (Run P1_R26)
-10 -10 0 10 20 Time (s) Figure 4 Water level at 0Fwd-S06 as a function of time Air Pressure Run P1_R26 1,000 800
Air Pressure 0Fwd-S06 Moving Average
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-200 -10 0 10 20 Model Scale Time (s) Figure 5 Air pressure in tank 0Fwd-S06 as a function of time
Figure 5 is a plot of the change in air pressure as a function of time within compartment 0Fwd-S06, which was located in the forward lower starboard tank (see Figure 1). As can be seen, there was considerable noise in the signal as water was entering the tank, however the signal noise level dramatically decreased as the water level within the tank reached equilibrium after just over
©2012: The Royal Institution of Naval Architects
38s. This appeared to coincide with a reduction in the level of bubbles that were occurring as this tank filled up through the hatchway, which were visible in the video footage. To provide a clearer picture of how the air pressure changes, a moving average curve has been added, as shown in black (period of moving average = 100 samples).
A-57 30 40 50
Air Pressure (Pa)
Water Level
(mm)
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