Publicações

Zhang, H., Cherneva, Z., Guedes Soares, C. e Onorato, M. (2013), “Comparison of distributions of wave heights from nonlinear Sch“Comparison of Distributions of Wave Heights from Nonlinear Schröedinger Equation Simulations and Laboratory Experiments”, Proceedings of the ASME 2013 32nd International Conference on Ocean, offshore and Arctic Engineering (OMAE2013), June 9-14, Nantes, France, pp. 11633

Numerical simulations of the nonlinear Schrödinger (NLS) equation are performed by using random initial wave conditions characterized by the JONSWAP spectrum and compared with four different sea states generated in the deep water wave basin of Marintek. The comparisons show that the numerical simulations have a high degree of agreement with the laboratory experiments although a little overestimation can be observed, especially in the severe sea state. Thus the simulations still catch the main characteristics of the extreme waves and provide an important physical insight into their generation. The coefficient of kurtosis ?40 presents a similar spatial evolution trend with the abnormal wave density and the nonlinear Gram-Charlier (GC) model is used to predict the wave height distribution. It is demonstrated again that the theoretical approximation based on the GC expansion candescribe the larger wave heights reasonably well in most cases. However, if the sea state is severe, wave breaking can significantly decrease the tail of wave height distribution in reality and the discrepancy occurs comparing with the numerical simulation. Moreover, the number of waves also plays an important role on the prediction of extreme wave height.

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