Abstract
In this work we present a multilayer approach to the solution of non-stationary 3D Navier–Stokes equations. We use piecewise smooth weak solutions. We approximate the velocity by a piecewise constant (in z) horizontal velocity and a linear (in z) vertical velocity in each layer, possibly discontinuous across layer interfaces. The multilayer approach is deduced by using the variational formulation and by considering a reduced family of test functions. The procedure naturally provides the mass and momentum interfaces conditions. The mass and momentum conservation across interfaces is formulated via normal flux jump conditions. The jump conditions associated to momentum conservation are formulated by means of an approximation of the vertical derivative of the velocity that appears in the stress tensor. We approximate the multilayer model for hydrostatic pressure, by using a polynomial viscosity matrix finite volume scheme and we present some numerical tests that show the main advantages of the model: it improves the approximation of the vertical velocity, provides good predictions for viscous effects and simulates re-circulations behind solid obstacles.
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Acknowledgments
We thank E. Audusse, M.J. Castro, A. Mangeney, J. Sainte-Marie and C. Parés for the interesting discussion on the multilayer approach during the conference “Numerical methods for Hyperbolic Equations Theory and Applications” to honour Professor E.F. Toro in his 65th birthday, in July 2011, Santiago de Compostela, Spain. We also thank the organizers of this conference to bring us this meaningful opportunity of meeting and discussion.
This work has been partially supported by Spanish Ministerio de Educación y Ciencia Research Project MTM2009-07719.
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Fernández-Nieto, E.D., Koné, E.H. & Chacón Rebollo, T. A Multilayer Method for the Hydrostatic Navier-Stokes Equations: A Particular Weak Solution. J Sci Comput 60, 408–437 (2014). https://doi.org/10.1007/s10915-013-9802-0
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DOI: https://doi.org/10.1007/s10915-013-9802-0