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- W576537514 abstract "The derivation of the fifth-order Korteweg—de Vries equation is presented for internal waves in two-layer fluid with surface tension on the interface between the layers. The fluid motion is not supposed to be potential, therefore similar derivation can be used for consideration of wave motion in viscous fluid, in rotated fluid or for the shear flows with nonzero vorticity. Explicit expressions are obtained for the coefficients of the equation depending on the parameters of the background medium: widths of the layers, densities of the fluids, coefficient of surface tension. It is shown that for some combinations of the parameters of background medium the coefficients of the quadratic nonlinear and lowest order dispersive terms in the derived generalized equation can vanish and change their signs. Especially interesting is the situation when these terms become small simultaneously, and the coefficients at the nonlinear dispersive terms are also small. This is possible when the widths of the layers are almost equal. In the vicinity of such a double critical point the derived equation reduces to the Gardner-Kawahara equation, which possesses solitary wave solutions with oscillating tails. Such a property makes this equation attractive theoretically and from the point of view of practical applications in the problems of flows in thin surface films of immiscible fluids. The characteristics of the flow in the presence of solitons significantly differ from those in the laminar flows, and this can lead to either negative or positive effects. On the base of the derived generalized equation and its solutions one can propose a method of control over a flow." @default.
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- W576537514 date "2014-01-01" @default.
- W576537514 modified "2023-09-23" @default.
- W576537514 title "Generalized Korteweg–de Vries equation for internal waves in two-layer fluid" @default.
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