Air entrainment in transient flows in closed water pipes : A two-layer approach
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 47 (2013) no. 2, p. 507-538

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.

DOI : https://doi.org/10.1051/m2an/2012036
Classification:  74S10,  35L60,  74G15
Keywords: two-layer vertically averaged flow, free surface water flows, loss of hyperbolicity, nonconservative product, two-layer kinetic scheme, real boundary conditions
@article{M2AN_2013__47_2_507_0,
author = {Bourdarias, C. and Ersoy, M. and Gerbi, St\'ephane},
title = {Air entrainment in transient flows in closed water pipes : A two-layer approach},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
publisher = {EDP-Sciences},
volume = {47},
number = {2},
year = {2013},
pages = {507-538},
doi = {10.1051/m2an/2012036},
zbl = {1267.76009},
mrnumber = {3021696},
language = {en},
url = {http://www.numdam.org/item/M2AN_2013__47_2_507_0}
}

Bourdarias, C.; Ersoy, M.; 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, Volume 47 (2013) no. 2, pp. 507-538. doi : 10.1051/m2an/2012036. http://www.numdam.org/item/M2AN_2013__47_2_507_0/

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