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Stability of discontinuity structures described by a generalized KdV-Burgers equation. (English. Russian original) Zbl 1346.35178
Comput. Math. Math. Phys. 56, No. 2, 263-277 (2016); translation from Zh. Vychisl. Mat. Mat. Fiz. 56, No. 2, 259-274 (2016).
Summary: The stability of discontinuities representing solutions of a model generalized KdV-Burgers equation with a nonmonotone potential of the form $$\phi(u) = u^4-u^2$$ is analyzed. Among these solutions, there are ones corresponding to special discontinuities. A discontinuity is called special if its structure represents a heteroclinic phase curve joining two saddle-type special points (of which one is the state ahead of the discontinuity and the other is the state behind the discontinuity). The spectral (linear) stability of the structure of special discontinuities was previously studied. It was shown that only a special discontinuity with a monotone structure is stable, whereas special discontinuities with a nonmonotone structure are unstable. In this paper, the spectral stability of nonspecial discontinuities is investigated. The structure of a nonspecial discontinuity represents a phase curve joining two special points: a saddle (the state ahead of the discontinuity) and a focus or node (the state behind the discontinuity). The set of nonspecial discontinuities is examined depending on the dispersion and dissipation parameters. A set of stable nonspecial discontinuities is found.

##### MSC:
 35Q53 KdV equations (Korteweg-de Vries equations) 35B35 Stability in context of PDEs 35B38 Critical points of functionals in context of PDEs (e.g., energy functionals)
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