Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2009-10-18
Mathematics and Computers in Simulation 82 (6), 2012, pp. 1069-1078
Nonlinear Sciences
Pattern Formation and Solitons
10 pages, 4 figures (9 images); v2: minor revision, version accepted for publication in Math. Comput. Simulat
Scientific paper
10.1016/j.matcom.2010.05.021
Recent numerical work on the Zabusky--Kruskal experiment has revealed, amongst other things, the existence of hidden solitons in the wave profile. Here, using Osborne's nonlinear Fourier analysis, which is based on the periodic, inverse scattering transform, the hidden soliton hypothesis is corroborated, and the \emph{exact} number of solitons, their amplitudes and their reference level is computed. Other "less nonlinear" oscillation modes, which are not solitons, are also found to have nontrivial energy contributions over certain ranges of the dispersion parameter. In addition, the reference level is found to be a non-monotone function of the dispersion parameter. Finally, in the case of large dispersion, we show that the one-term nonlinear Fourier series yields a very accurate approximate solution in terms of Jacobian elliptic functions.
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