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Numerical simulation of sand dune evolution in severe winds
Author(s) -
Ortiz Pablo,
Smolarkiewicz Piotr K.
Publication year - 2005
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1138
Subject(s) - geology , curvilinear coordinates , advection , sediment transport , mechanics , solver , partial differential equation , landform , boundary layer , boundary value problem , meteorology , computer simulation , geometry , geomorphology , mathematics , physics , mathematical analysis , sediment , mathematical optimization , thermodynamics
Abstract We present a novel approach for numerical simulation of fluid flow and sediment transport past evolutionary landforms, with emphasis on sand dunes developing in extreme winds. Time‐dependent curvilinear coordinates are employed to fully couple flow aloft with the developing landform. The conservation law that defines shape of the lower boundary depends on details of local surface stress, thereby favouring a large eddy simulation of the atmospheric boundary layer. The flux‐form partial differential equation for the interface profile—via saltation and sand avalanches—is formulated as an advection–diffusion equation. The latter facilitates discrete integrations using nonoscillatory algorithms—consistent with the nonoscillatory forward‐in‐time solver, based on MPDATA transport methods, employed to simulate the boundary layer flow aloft. Theoretical discussions are illustrated with numerical experiments that explore the interactive evolution of the dune/atmosphere system. Copyright © 2005 John Wiley & Sons, Ltd.