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Comparison of the Effectiveness of Different Methods for Constructing Exact Solutions to Nonlinear PDEs. Generalizations and New Solutions

1
Ishlinsky Institute for Problems in Mechanics RAS, 101 Vernadsky Avenue, bldg 1, 119526 Moscow, Russia
2
Department of Applied Mathematics, Bauman Moscow State Technical University, 5 Second Baumanskaya Street, 105005 Moscow, Russia
3
Department of Applied Mathematics, National Research Nuclear University MEPhI, 31 Kashirskoe Shosse, 115409 Moscow, Russia
Mathematics 2019, 7(5), 386; https://doi.org/10.3390/math7050386
Received: 22 March 2019 / Revised: 24 April 2019 / Accepted: 25 April 2019 / Published: 28 April 2019
(This article belongs to the Section Mathematics and Computers Science)
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PDF [307 KB, uploaded 28 April 2019]

Abstract

The paper shows that, in looking for exact solutions to nonlinear PDEs, the direct method of functional separation of variables can, in certain cases, be more effective than the method of differential constraints based on the compatibility analysis of PDEs with a single constraint (or the nonclassical method of symmetry reductions based on an invariant surface condition). This fact is illustrated by examples of nonlinear reaction-diffusion and convection-diffusion equations with variable coefficients, and nonlinear Klein–Gordon-type equations. Hydrodynamic boundary layer equations, nonlinear Schrödinger type equations, and a few third-order PDEs are also investigated. Several new exact functional separable solutions are given. A possibility of increasing the efficiency of the Clarkson–Kruskal direct method is discussed. A generalization of the direct method of the functional separation of variables is also described. Note that all nonlinear PDEs considered in the paper include one or several arbitrary functions. View Full-Text
Keywords: functional separation of variables; differential constraints; nonclassical method; symmetry reductions; invariant surface condition; Clarkson–Kruskal direct method; nonlinear Klein–Gordon equations; boundary layer equations; Schrödinger type equations; exact solutions functional separation of variables; differential constraints; nonclassical method; symmetry reductions; invariant surface condition; Clarkson–Kruskal direct method; nonlinear Klein–Gordon equations; boundary layer equations; Schrödinger type equations; exact solutions
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Polyanin, A.D. Comparison of the Effectiveness of Different Methods for Constructing Exact Solutions to Nonlinear PDEs. Generalizations and New Solutions. Mathematics 2019, 7, 386.

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