Seminar talk, 10 February 2021

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Speaker: Alexey Samokhin

Title: On monotonic pattern in periodic boundary solutions of cylindrical and spherical Kortweg-de Vries-Burgers equations

We studied, for the Kortweg-de Vries Burgers equations on cylindrical and spherical waves, the development of a regular profile starting from an equilibrium under a periodic perturbation at the boundary.

The regular profile at the vicinity of perturbation looks like a periodical chain of shock fronts with decreasing amplitudes. Further on, shock fronts become decaying smooth quasi periodic oscillations. After the oscillations cease, the wave develops as a monotonic convex wave, terminated by a head shock of a constant height and equal velocity. This velocity depends on integral characteristics of a boundary condition and on spatial dimensions.

The explicit asymptotic formulas for the monotonic part, the head shock and a median of the oscillating part are found.

Language: English

Slides: zoom-lab 6-eng.pdf