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A mathematical model for unsteady mixed flows in closed water pipes

By Christian Bourdarias, Mehmet Ersoy and Stéphane Gerbi

Abstract

International audienceWe present the formal derivation of a new unidirectional model for unsteady mixed flows in non uniform closed water pipe. In the case of free surface incompressible flows, the \FS-model is formally obtained, using formal asymptotic analysis, which is an extension to more classical shallow water models. In the same way, when the pipe is full, we propose the \Pres-model, which describes the evolution of a compressible inviscid flow, close to gas dynamics equations in a nozzle. In order to cope the transition between a free surface state and a pressured (i.e. compressible) state, we propose a mixed model, the \PFS-model, taking into account changes of section and slope variation

Topics: asymptotic analysis, Shallow water equations, unsteady mixed flows, free surface flows, pressurized flows, curvilinear transformation, asymptotic analysis., [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP]
Publisher: 'Springer Science and Business Media LLC'
Year: 2012
DOI identifier: 10.1007/s11425-011-4353-z
OAI identifier: oai:HAL:hal-00599656v1
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