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A new model for shallow viscoelastic fluids

Abstract : We propose a new reduced model for gravity-driven free-surface flows of shallow elastic fluids. It is obtained by an asymptotic expansion of the upper-convected Maxwell model for elastic fluids. The viscosity is assumed small (of order epsilon, the aspect ratio of the thin layer of fluid), but the relaxation time is kept finite. Additionally to the classical layer depth and velocity in shallow models, our system describes also the evolution of two scalar stresses. It has an intrinsic energy equation. The mathematical properties of the model are established, an important feature being the non-convexity of the physically relevant energy with respect to conservative variables, but the convexity with respect to the physically relevant pseudo-conservative variables. Numerical illustrations are given, based on a suitable well-balanced finite-volume discretization involving an approximate Riemann solver.
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https://hal-enpc.archives-ouvertes.fr/hal-00628651
Contributeur : Sébastien Boyaval <>
Soumis le : mercredi 8 août 2012 - 23:16:57
Dernière modification le : lundi 30 mars 2020 - 12:04:16
Archivage à long terme le : : vendredi 16 décembre 2016 - 05:03:04

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François Bouchut, Sébastien Boyaval. A new model for shallow viscoelastic fluids. Mathematical Models and Methods in Applied Sciences, World Scientific Publishing, 2013, 23 (8), pp.1479-1526. ⟨10.1142/S0218202513500140⟩. ⟨hal-00628651v2⟩

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