Prediction of Slamming Occurrence on Catamaran Cross Structures

Abstract

In this paper, we study the problem of wave slamming on the cross structures of both fast ferry type catamarans and ocean going racing sailing catamarans. The emphasis is given to the prediction of the statistical distributions of slamming occurrence and slamming pressure magnitudes in a random seaway. A partly non-linear high-speed strip theory sea-keeping program is used to calculate the vessel motions and the relative motions between any part of the hull and the sea surface, including slamming impact velocity. Impact velocities are classified in 5 groups, and slamming pressures calculated for each group. To calculate vessel motions of heeled sailing catamarans a strip method for an asymmetric multi-hull is developed; the theory and initial results are presented. An investigation into the effect of sail forces on motions and slamming occurrence is also performed. The sail forces are found to be an important factor in predicting motions of sailing catamarans. The procedure proposed in this paper gives the necessary information to estimate the maximum slamming pressures the vessel is likely to encounter and equally importantly the expected frequency of lighter slams, which is useful for fatigue calculations.

Seakeeping Prediction of Deep-v High Speed Catamaran Using Computational Fluid Dynamics Approach

“…Several researchers had studied the behavior of multihull ship using analytical, experimental and numerical methods to predictions the seakeeping performance. According to (Grande & Xia, 2002), (Belknap, 2008), (Lin et al, 2017 ) and (Aribenchi, 2017) seakeeping performance was also predicted using strip theory method. Besides that, (Vakilabadi, Khedmati, & Seif, 2014), (Yanuar, Ibadurrahman, Karim, & Ichsan, 2017), (Abdul Ghani & Wilson, 2017) and (Zotti, 2007) studies the behavior of catamaran ship using experimental method approach that have their own disadvantages such as complex procedure, costly and time-consuming.…”

Effect of flat deck on catamaran water entry through smoothed particle hydrodynamics

“…They presented free surface and pressure time history. Grande and Xia 6 studied statistical distributions of slamming occurrence and slamming pressure magnitudes in a random seaway of two types of catamarans. They used a nonlinear high-speed strip program to calculate the vessel motions and relative motions between the hull and water surface.…”