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arXiv 1105.0629math.AP
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(2+1)维Kuramoto-Sivashinsky方程的经典与非经典对称性

Classical and Nonclassical symmetries of the (2+1)-dimensional Kuramoto-Sivashinsky equation

Mehdi Nadjafikhah, Fatemeh Ahangari

摘要:

本文研究了非线性动力系统的一个重要例子:二维和一维的Kuramoto-Sivashinsky(K-S)模型的最大可能对称集的确定问题。应用经典对称性方法,我们找到了K-S模型的经典对称性算符。讨论了对称性李代数的结构,构造了方程的最优子代数系。指出了与对称生成元相关的Lie不变量以及相应的相似简化方程。通过对K-S模型应用非经典对称性方法,我们得出结论,所分析的模型不允许补充的非经典型对称性。使用这个过程,只生成经典的李算子。

英文摘要:

In this paper, we have studied the problem of determining the largest possible set of symmetries for an important example of nonlinear dynamical system: the Kuramoto-Sivashinsky (K-S) model in two spatial and one temporal dimensions. By applying the classical symmetry method for the K-S model, we have found the classical symmetry operators. Also, the structure of the Lie algebra of symmetries is discussed and the optimal system of subalgebras of the equation is constructed. The Lie invariants associated to the symmetry generators as well as the corresponding similarity reduced equations are also pointed out. By applying the nonclassical symmetry method for the K-S model we concluded that the analyzed model do not admit supplementary, nonclassical type, symmetries. Using this procedure, the classical Lie operators only were generated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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