Journal ArticleDOI
Fourth-order nonlinear evolution equation for two Stokes wave trains in deep water
A. K. Dhar,K. P. Das +1 more
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In this paper, the authors derived the fourth-order nonlinear evolution equations for a deepwater surface gravity wave packet in the presence of a second wave packet, where it is assumed that the space variation of the amplitude takes place only in a direction along which the group velocity projection of the two waves overlap.Abstract:
Fourth‐order nonlinear evolution equations, which are a good starting point for the study of nonlinear water waves as first pointed out by Dysthe [Proc. R. Soc. London Ser. A 369, 105 (1979)] and later elaborated by Janssen [J. Fluid Mech. 126, 1 (1983)], are derived for a deep‐water surface gravity wave packet in the presence of a second wave packet. Here it is assumed that the space variation of the amplitude takes place only in a direction along which the group velocity projection of the two waves overlap. Stability analysis is made for a uniform Stokes wave train in the presence of a second wave train. Graphs are plotted for maximum growth rate of instability and for wave number at marginal stability against wave steepness. Significant deviations are noticed from the results obtained from the third‐order evolution equations which consist of two coupled nonlinear Schrodinger equations.read more
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Instability and evolution of nonlinearly interacting water waves
Padma Kant Shukla,Padma Kant Shukla,Ioannis Kourakis,Bengt Eliasson,Mattias Marklund,Lennart Stenflo +5 more
TL;DR: The modulational instability of nonlinearly interacting two-dimensional waves in deep water is considered by means of computer simulations of the governing nonlinear equations and the formation of localized coherent wave envelopes is demonstrated.
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Bright N-soliton solutions in terms of the triple Wronskian for the coupled nonlinear Schrödinger equations in optical fibers
TL;DR: In this article, the authors used the Darboux transformation to prove that the NLS equations of the Manakov type have triple Wronskian solutions, which are characterized by 3N complex parameters.
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Integrable aspects and applications of a generalized inhomogeneous N-coupled nonlinear Schrödinger system in plasmas and optical fibers via symbolic computation
TL;DR: For describing the general behavior of N fields propagating in inhomogeneous plasmas and optical fibers, a generalized N-coupled nonlinear Schrodinger system is investigated with symbolic computation in this article.
Journal ArticleDOI
Fourth-order coupled nonlinear Schrödinger equations for gravity waves on deep water
Odin Gramstad,Karsten Trulsen +1 more
TL;DR: In this paper, a set of fourth-order coupled nonlinear Schrodinger equations describing the evolution of two two-dimensional systems of deep-water gravity waves with different wavenumbers or directions of propagation is derived.
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A semi-explicit multi-symplectic splitting scheme for a 3-coupled nonlinear Schrödinger equation
Xu Qian,Songhe Song,Yaming Chen +2 more
TL;DR: Numerical experiments show the effectiveness of the proposed semi-explicit multi-symplectic splitting scheme to solve a 3-coupled nonlinear Schrodinger equation during long-time numerical calculation.
References
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Journal ArticleDOI
The disintegration of wave trains on deep water Part 1. Theory
T. Brooke Benjamin,J. E. Feir +1 more
TL;DR: In this paper, a theoretical analysis of the stability of periodic wave trains to small disturbances in the form of a pair of side-band modes is presented, where the wave train becomes highly irregular far from its origin, even when the departures from periodicity are scarcely detectable at the start.
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Note on a Modification to the Nonlinear Schrodinger Equation for Application to Deep Water Waves
TL;DR: In this paper, a significant improvement can be achieved by taking the perturbation analysis one step further O (∊ 4 ) by introducing the mean flow response to non-uniformities in the radiation stress caused by modulation of a finite amplitude wave.
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The instabilities of gravity waves of finite amplitude in deep water I. Superharmonics
TL;DR: In this paper, the authors extended the analysis of the normal-mode perturbation of steep irrotational gravity waves to subharmonic perturbations, namely those having horizontal scales greater than the basic wavelength (2π/k).
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Phase velocity effects in tertiary wave interactions
TL;DR: In this article, it was shown that when two trains of waves in deep water interact, the phase velocity of each is modified by the presence of the other, and the change in phase velocity is of second order and is distinct from the increase predicted by Stokes for a single wave train.
Journal ArticleDOI
Energy transport in a nonlinear and inhomogeneous random gravity wave field.
TL;DR: In this paper, the contribution of tertiary resonant interactions to the total energy transfer in an inhomogeneous random field of gravity waves is calculated, and it is found to be small for open-ocean waves, but to be of some importance for shallow-water waves, where topography or mean shear currents may produce strong inhomogeneities.