A model for unsteady mixed flows in non uniform closed water pipes and a well-balanced finite volume scheme

Abstract : We present the derivation of a new unidirectional model for We present the derivation of a new unidirectional model for unsteady mixed flows in non uniform closed water pipes. We introduce a local reference frame to take into account the local perturbation caused by the changes of section and slope. Then an asymptotic analysis is performed to obtain a model for free surface flows and another one for pressurized flows. By coupling these models through the transition points by the use of a common set of variables and a suitable pressure law, we obtain a simple formulation called PFS-model close to the shallow water equations with source terms. It takes into account the changes of section and the slope variation in a continuous way through transition points. Transition point between the two types of flows is treated as a free boundary associated to a discontinuity of the gradient of pressure. The numerical simulation is performed by making use of a Roe-like finite volume scheme that we adapted to take into account geometrical source terms in the convection matrix. Finally some numerical tests are presented.
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Submitted on : Friday, November 6, 2009 - 4:50:45 PM
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  • HAL Id : hal-00342745, version 3
  • ARXIV : 0812.0057

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Christian Bourdarias, Mehmet Ersoy, Stéphane Gerbi. A model for unsteady mixed flows in non uniform closed water pipes and a well-balanced finite volume scheme. International Journal on Finite Volumes, Institut de Mathématiques de Marseille, AMU, 2009, 6 (2), pp.1-47. ⟨hal-00342745v3⟩

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