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A thorough description of one-dimensional steady open channel flows using the notion of viscosity solution

Mean, Sovanna Unami, Koichi Okamoto, Hisashi Fujihara, Masayuki 京都大学 DOI:10.1016/j.amc.2021.126730

2022.02.15

概要

Determining water surface profiles of steady open channel flows in a one-dimensional bounded domain is one of the well-trodden topics in conventional hydraulic engineering. However, it involves Dirichlet problems of scalar first-order quasilinear ordinary differential equations, which are of mathematical interest. We show that the notion of viscosity solution is useful in thoroughly describing the characteristics of possibly non-smooth and discontinuous solutions to such problems, achieving the conservation of momentum and the entropy condition. Those viscosity solutions are the generalized solutions in the space of bounded measurable functions. Generalized solutions to some Dirichlet problems are not always unique, and a necessary condition for the non-uniqueness is derived. A concrete example illustrates the non-uniqueness of discontinuous viscosity solutions in a channel of a particular cross-sectional shape.

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S. Mean, K. Unami, H. Okamoto et al.

Applied Mathematics and Computation 415 (2022) 126730

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