Numerical and experimental evaluation of rogue waves and corresponding ship motions at forward speed

Denchfield, S.S., Hudson, D.A. and Temarel, P. (2010) Numerical and experimental evaluation of rogue waves and corresponding ship motions at forward speed. 28th Symposium on Naval Hydrodynamics, Pasadena, United States. 11 - 16 Sep 2010. 17 pp .

Abstract

Rogue waves are a phenomenon that has grown in importance in recent decades. The ability to model rogue waves and their interaction with a moving ship is important for the understanding of any problems such an encounter may cause. This paper compares unidirectional, experimental random and rogue waves to both linear and second order wave theories. Rogue waves are generated successfully numerically and experimentally using the NewWave, and optimisation techniques. Results show that as significant wave height, hence rogue wave height, increases, the experimental wave traces exhibit greater second order characteristics in the vicinity of the rogue wave peak. The two rogue wave models are used to investigate, experimentally and numerically (using a 2D linear rigid body model), the influence of forward speed on rogue wave encounters. Comparisons are in terms of heave and pitch motions, and reference is made to equivalent motions in random seas of low and high significant wave heights. Such motions become more severe with the introduction of a rogue wave into a seaway. The 2D linear model shows good agreement at low and mid-range speeds but at high speeds shows some considerable discrepancies with experiments. This is likely to be due to the extreme “tunnelling” motion seen at high speed in large seas during experiments

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Contributors

Author: D.A. Hudson

Author: P. Temarel

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