# Air entrainment in transient flows in closed water pipes : A two-layer approach

• Volume: 47, Issue: 2, page 507-538
• ISSN: 0764-583X

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## Abstract

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In this paper, we first construct a model for free surface flows that takes into account the air entrainment by a system of four partial differential equations. We derive it by taking averaged values of gas and fluid velocities on the cross surface flow in the Euler equations (incompressible for the fluid and compressible for the gas). The obtained system is conditionally hyperbolic. Then, we propose a mathematical kinetic interpretation of this system to finally construct a two-layer kinetic scheme in which a special treatment for the “missing” boundary condition is performed. Several numerical tests on closed water pipes are performed and the impact of the loss of hyperbolicity is discussed and illustrated. Finally, we make a numerical study of the order of the kinetic method in the case where the system is mainly non hyperbolic. This provides a useful stability result when the spatial mesh size goes to zero.

## How to cite

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Bourdarias, C., Ersoy, M., and Gerbi, Stéphane. "Air entrainment in transient flows in closed water pipes : A two-layer approach." ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique 47.2 (2013): 507-538. <http://eudml.org/doc/273176>.

@article{Bourdarias2013,
abstract = {In this paper, we first construct a model for free surface flows that takes into account the air entrainment by a system of four partial differential equations. We derive it by taking averaged values of gas and fluid velocities on the cross surface flow in the Euler equations (incompressible for the fluid and compressible for the gas). The obtained system is conditionally hyperbolic. Then, we propose a mathematical kinetic interpretation of this system to finally construct a two-layer kinetic scheme in which a special treatment for the “missing” boundary condition is performed. Several numerical tests on closed water pipes are performed and the impact of the loss of hyperbolicity is discussed and illustrated. Finally, we make a numerical study of the order of the kinetic method in the case where the system is mainly non hyperbolic. This provides a useful stability result when the spatial mesh size goes to zero.},
author = {Bourdarias, C., Ersoy, M., Gerbi, Stéphane},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique},
keywords = {two-layer vertically averaged flow; free surface water flows; loss of hyperbolicity; nonconservative product; two-layer kinetic scheme; real boundary conditions},
language = {eng},
number = {2},
pages = {507-538},
publisher = {EDP-Sciences},
title = {Air entrainment in transient flows in closed water pipes : A two-layer approach},
url = {http://eudml.org/doc/273176},
volume = {47},
year = {2013},
}

TY - JOUR
AU - Bourdarias, C.
AU - Ersoy, M.
AU - Gerbi, Stéphane
TI - Air entrainment in transient flows in closed water pipes : A two-layer approach
JO - ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
PY - 2013
PB - EDP-Sciences
VL - 47
IS - 2
SP - 507
EP - 538
AB - In this paper, we first construct a model for free surface flows that takes into account the air entrainment by a system of four partial differential equations. We derive it by taking averaged values of gas and fluid velocities on the cross surface flow in the Euler equations (incompressible for the fluid and compressible for the gas). The obtained system is conditionally hyperbolic. Then, we propose a mathematical kinetic interpretation of this system to finally construct a two-layer kinetic scheme in which a special treatment for the “missing” boundary condition is performed. Several numerical tests on closed water pipes are performed and the impact of the loss of hyperbolicity is discussed and illustrated. Finally, we make a numerical study of the order of the kinetic method in the case where the system is mainly non hyperbolic. This provides a useful stability result when the spatial mesh size goes to zero.
LA - eng
KW - two-layer vertically averaged flow; free surface water flows; loss of hyperbolicity; nonconservative product; two-layer kinetic scheme; real boundary conditions
UR - http://eudml.org/doc/273176
ER -

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