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December 2010 Lie symmetries and exact solutions of a class of thin film equations
Roman Cherniha, Liliia Myroniuk
J. Phys. Math. 2: 1-19 (December 2010). DOI: 10.4303/jpm/P100508


A symmetry group classification for fourth-order reaction-diffusion equations, allowing for both second-order and fourth-order diffusion terms, is carried out. The fourth-order equations are treated, firstly, as systems of second-order equations that bear some resemblance to systems of coupled reaction-diffusion equations with cross diffusion, secondly, as systems of a second-order equation and two first-order equations. The paper generalizes the results of Lie symmetry analysis derived earlier for particular cases of these equations. Various exact solutions are constructed using Lie symmetry reductions of the reaction-diffusion systems to ordinary differential equations. The solutions include some unusual structures as well as the familiar types that regularly occur in symmetry reductions, namely, self-similar solutions, decelerating and decaying traveling waves, and steady states.


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Roman Cherniha. Liliia Myroniuk. "Lie symmetries and exact solutions of a class of thin film equations." J. Phys. Math. 2 1 - 19, December 2010.


Published: December 2010
First available in Project Euclid: 25 October 2010

zbMATH: 1264.74156
Digital Object Identifier: 10.4303/jpm/P100508

Primary: 35K50 , 35K60

Keywords: exact solutions , Lie symmetries , thin film equations

Rights: Copyright © 2010 Ashdin Publishing (2009-2013) / OMICS International (2014-2016)


Vol.2 • December 2010
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