Algorithmic framework for group analysis of differential equations and its application to generalized Zakharov-Kuznetsov equations

JOURNAL OF DIFFERENTIAL EQUATIONS

卷:260

Article

Huang, Ding-jiang¹  Ivanova, Nataliya M.² 

[1] E China Univ Sci & Technol, Dept Math, Shanghai 200237, Peoples R China

[2] NAS Ukraine, Inst Math, 3 Tereshchenkivska Str, UA-01601 Kiev, Ukraine

关键词: Group classification;    Equivalence transformation;    Symmetry reduction;    Generalized Zakharov-Kuznetsov equations;    Invariant solutions;   

DOI  :  10.1016/j.jde.2015.10.005

来源: Elsevier

【 摘 要 】

In this paper, we explain in more details the modern treatment of the problem of group classification of (systems of) partial differential equations (PDEs) from the algorithmic point of view. More precisely, we revise the classical Lie algorithm of construction of symmetries of differential equations, describe the group classification algorithm and discuss the process of reduction of (systems of) PDEs to (systems of) equations with smaller number of independent variables in order to construct invariant solutions. The group classification algorithm and reduction process are illustrated by the example of the generalized Zakharov-Kuznetsov (GZK) equations of form u(t) + (F(u))(xxx) + (G(u))(xyy) + (H(u))(x) = 0. As a result, a complete group classification of the GZK equations is performed and a number of new interesting nonlinear invariant models which have non-trivial invariance algebras are obtained. Lie symmetry reductions and exact solutions for two important invariant models, i.e., the classical and modified Zakharov-Kuznetsov equations, are constructed. The algorithmic framework for group analysis of differential equations presented in this paper can also be applied to other nonlinear PDEs. (C) 2015 Elsevier Inc. All rights reserved.

【 授权许可】

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