Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2001-08-05
Nonlinear Sciences
Pattern Formation and Solitons
A text file in the latex format and 20 eps files with figures. Physical Review E, in press
Scientific paper
10.1103/PhysRevE.64.046304
A model consisting of a mixed Kuramoto - Sivashinsky - KdV equation, linearly coupled to an extra linear dissipative equation, is proposed. The model applies to the description of surface waves on multilayered liquid films. The extra equation makes its possible to stabilize the zero solution in the model, opening way to the existence of stable solitary pulses (SPs). Treating the dissipation and instability-generating gain in the model as small perturbations, we demonstrate that balance between them selects two steady-state solitons from their continuous family existing in the absence of the dissipation and gain. The may be stable, provided that the zero solution is stable. The prediction is completely confirmed by direct simulations. If the integration domain is not very large, some pulses are stable even when the zero background is unstable. Stable bound states of two and three pulses are found too. The work was supported, in a part, by a joint grant from the Israeli Minsitry of Science and Technology and Japan Society for Promotion of Science.
Feng Bao-Feng
Kawahara Takuji
Malomed Boris
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