50m Fast Support Intervention Vessel in waves

Jan 30, 2015

In this video, the calculations in Computational Fluid Dynamic of the De Hoop 50 meter Fast Supply Intervention Vessel (FSIV) is visualized. On the left, the vessel is displayed without Hull Vane®. On the right, a Hull Vane® is included. In the middle, respectively the heave, pitch, acceleration at 0.9 LWL, and the resistance is shown for both vessels. In these graphs, the red line represents the model without Hull Vane®, the blue line depicts the model with Hull Vane. The tests were carried out at 20 knots, in typical wave conditions: HW = 1.0 m, TW = 5.7 s.

In the first two graphs can be observed that the root-mean-squares (RMS) of both the heave and the pitch motion are reduced by the addition of the Hull Vane®. This leads to a 10% reduction of the vertical accelerations at 0.9 LWL. Because the Hull Vane® is attached near the aft of the vessel, the accelerations are even more reduced on the aft of the vessel. The RMS of the vertical accelerations at the aft of the vessel are reduced by 20% (not in video). In the fourth graph can be seen that the mean resistance of the vessel is reduced with the inclusion of a Hull Vane®. The resistance reduction is even more than in calm water, showing that the Hull Vane® is even more effective in waves than in calm water.

These results underline the benefits of (retro-)fitting the Hull Vane® to the aft of a vessel. This leads to increased comfort, a broader range of operability, and a reduced resistance of the vessel, in calm water and waves