Abstract: The foundations of group analysis of differential equations were laid by S. Lie. This theory was essentially developed in works of L. V. Ovsiannikov, N. H. Ibragimov, their students, and followers. Notion of the partially invariant solution to the system of differential equations (Ovsiannikov 1964) substantially extended possibilities of exact solutions construction for multidimensional systems of differential equations admitting the Lie group. It is important to note that fundamental equations of continuum mechanics and physics fall in this class a priori as invariance principle of space, time, and moving medium there with respect to some group (Galilei, Lorenz, and others) are situated in the base of their derivation. It should be noticed that classical group analysis of differential equations has a local character. To apply this approach to initial boundary value problems, one need to provide the invariance properties of initial and boundary conditions. Author (1973) studied these properties for free boundary problems to the Navier–Stokes equations. Present chapter contains an example of partially invariant solution of these equations describing the motion of a rotating layer bounded by free surfaces.

Cite: Pukhnachev V.V.
Partial Invariance and Problems with Free Boundaries
Monography chapter Symmetries and Applications of Differential Equations. In Memory of Nail H. Ibragimov (1939–2018). – Springer., 2021. – C.251–267. DOI: 10.1007/978-981-16-4683-6_9 Scopus РИНЦ OpenAlex

Identifiers:

Scopus:	2-s2.0-85121729746
Elibrary:	47550179
OpenAlex:	W4205629151

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