Conditional symmetries and Riemann invariants for inhomogeneous hydrodynamic-type systems
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Publication:3058602
DOI10.1088/1751-8113/43/45/455217zbMATH Open1208.35008arXiv1005.4945OpenAlexW3105286827MaRDI QIDQ3058602
Author name not available (Why is that?)
Publication date: 3 December 2010
Published in: (Search for Journal in Brave)
Abstract: A new approach to the solution of quasilinear nonelliptic first-order systems of inhomogeneous PDEs in many dimensions is presented. It is based on a version of the conditional symmetry and Riemann invariant methods. We discuss in detail the necessary and sufficient conditions for the existence of rank-2 and rank-3 solutions expressible in terms of Riemann invariants. We perform the analysis using the Cayley-Hamilton theorem for a certain algebraic system associated with the initial system. The problem of finding such solutions has been reduced to expanding a set of trace conditions on wave vectors and their profiles which are expressible in terms of Riemann invariants. A couple of theorems useful for the construction of such solutions are given. These theoretical considerations are illustrated by the example of inhomogeneous equations of fluid dynamics which describe motion of an ideal fluid subjected to gravitational and Coriolis forces. Several new rank-2 solutions are obtained. Some physical interpretation of these results is given.
Full work available at URL: https://arxiv.org/abs/1005.4945
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