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Unified derivation of thin-layer reduced models for shallow free-surface gravity flows of viscous fluids

Abstract : We propose a unified framework to derive thin-layer reduced models for some shallow free-surface flows driven by gravity. It applies to incompressible homogeneous fluids whose momentum evolves according to Navier-Stokes equations, with stress satisfying a rheology of viscous type (i.e. the standard Newtonian law with a constant viscosity, but also non-Newtonian laws generalized to purely viscous fluids and to viscoelastic fluids as well). For a given rheology, we derive various thin-layer reduced models for flows on a rugous topography slowly varying around an inclined plane. This is achieved thanks to a coherent simplification procedure, which is formal but based on a mathematically clear consistency requirement between scaling assumptions and the approximation errors in the differential equations. The various thin-layer reduced models are obtained depending on flow regime assumptions (either fast/inertial or slow/viscous). As far as we know, it is the first time that the various thin-layer reduced models investigated here are derived within the same mathematical framework. Furthermore, we obtain new reduced models in the case of viscoelastic non-Newtonian fluids, which extends [Bouchut & Boyaval, M3AS (23) 8, 2013].
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Submitted on : Tuesday, May 5, 2015 - 1:27:02 PM
Last modification on : Friday, July 8, 2022 - 10:06:49 AM
Long-term archiving on: : Wednesday, April 19, 2017 - 4:27:33 PM

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François Bouchut, Sébastien Boyaval. Unified derivation of thin-layer reduced models for shallow free-surface gravity flows of viscous fluids . European Journal of Mechanics - B/Fluids, Elsevier, 2016, 55 (1), pp.116-131. ⟨10.1016/j.euromechflu.2015.09.003⟩. ⟨hal-00833468v2⟩

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