Abstract
We present the formal derivation of a new unidirectional model for unsteady mixed flows in nonuniform closed water pipes. 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 P-model, which describes the evolution of a compressible inviscid flow, close to gas dynamics equations in a nozzle. In order to cope with 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.
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Dedicated to the NSFC-CNRS Chinese-French summer institute on fluid mechanics in 2010
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Bourdarias, C., Ersoy, M. & Gerbi, S. A mathematical model for unsteady mixed flows in closed water pipes. Sci. China Math. 55, 221–244 (2012). https://doi.org/10.1007/s11425-011-4353-z
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DOI: https://doi.org/10.1007/s11425-011-4353-z
Keywords
- shallow water equations
- unsteady mixed flows
- free surface flows
- pressurized flows
- curvilinear transformation
- asymptotic analysis