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arXiv 1012.5606math-phmath.MP
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非线性边值问题的Lie对称性

Lie symmetries of nonlinear boundary value problems

Roman Cherniha, Sergii Kovalenko

摘要:

利用经典Lie对称方法研究了非线性边值问题。将已有的李不变性定义推广到更广泛的边值问题上,提出了边值问题李不变性的一个新定义。研究了一类二维非线性边值问题,该问题模拟了金属的熔化和蒸发过程。利用所提出的定义,构造了常微分方程边值问题的所有可能的Lie对称和相应的约化(具有物理意义)。给出了一个如何构造具有正确指定系数的问题的精确解的例子,并与以前发表的数值模拟结果进行了比较。

英文摘要:

Nonlinear boundary value problems (BVPs) by means of the classical Lie symmetry method are studied. A new definition of Lie invariance for BVPs is proposed by the generalization of existing those on much wider class of BVPs. A class of two-dimensional nonlinear boundary value problems, modeling the process of melting and evaporation of metals, is studied in details. Using the definition proposed, all possible Lie symmetries and the relevant reductions (with physical meaning) to BVPs for ordinary differential equations are constructed. An example how to construct exact solution of the problem with correctly-specified coefficients is presented and compared with the results of numerical simulations published earlier.

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