Trans RINA, Vol 157, Part A3, Intl J Maritime Eng, Jul-Sep 2015
decreases. An increasing density of the contour lines of the surface elevation indicate a very steep wave and wave breaking is likely to occur, though not in the simulations due to the chosen mesh density. The main features of the wave- pattern agree with those presented by other researchers [15].
Fr = 0.25
Figure 10 examines the free surface elevation for medium displacement at Fr = 0.41 for ship length of L = 110 – 190m. The wave height was scaled consistently with respect to ship length and black and white indicate absolute elevations of 1% of the ship length. Whilst the characteristic features of the wave
pattern remain
unchanged as slenderness increases the wave elevation as well as the rooster tail reduces.
L = 110 m Fr = 0.29
L = 130 m Fr = 0.33
L = 150 m Fr = 0.37
L = 170 m Fr = 0.41
L = 190 m Fr = 0.45
Fr = 0.49
Figure 10: Wave elevation of large medium-speed catamarans at Fr = 0.41 of 110 – 190 m in length at medium displacement (top to bottom).
Figure 9: Free surface elevation of 130 m medium-speed catamaran at medium displacement for Fr = 0.25, 0.29, 0.33, 0.37, 0.41, 0.45, and 0.49 from top to bottom.
©2015: The Royal Institution of Naval Architects
Finally, the influence of the displacement is shown in Figure 11 for L = 130m at Fr = 0.41. Again the main features of the wave pattern remain constant, but the wave elevation, as well as the rooster tail, increase in magnitude with increasing displacement.
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