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Lattice Boltzmann approach to simulating a wetting–drying front in shallow flows

Published online by Cambridge University Press:  03 March 2014

H. Liu  and
J. G. Zhou
H. Liu*
Affiliation:
Key Laboratory of Water and Sediment Sciences of Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China
J. G. Zhou
Affiliation:
School of Engineering, University of Liverpool, Brownlow Hill, Liverpool L69 3GQ, UK
*
†Email address for correspondence: haifei.liu@bnu.edu.cn
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Abstract

The paper reports a new lattice Boltzmann approach to simulating wetting–drying processes in shallow-water flows. The scheme is developed based on the Chapman–Enskog analysis and the Taylor expansion, which is consistent with the theory of the lattice Boltzmann method. All the forces, such as bed slope and bed friction, are taken into account naturally in determining the wet–dry interface, without the use of either the spurious assumption of a thin water film on a dry bed or the non-physical extrapolation of certain variables such as water depth or velocity. This offers a simple and general model for simulating wetting–drying processes in complex flows involving external forces. Its verification is carried out by modelling several one-dimensional (1D) and two-dimensional (2D) flows: (i) 1D sloshing over a parabolic container; (ii) a 1D tidal wave over three adverse bed slopes; (iii) a 1D solitary wave run up on a plane sloping beach; (iv) a tsunami run up on a plane beach; (v) a 2D stationary case with wet–dry boundaries; (vi) a 2D long-wave resonance over a parabolic basin; and (vii) a 2D solitary wave run up on a conical island. The numerical results agree well with analytical solutions, other numerical results and experimental data, demonstrating the effectiveness and accuracy of the new approach.

JFM classification

Mathematical Foundations: Computational methods Waves/Free-surface Flows: Hydraulics Waves/Free-surface Flows: Solitary waves
Type
Papers
Information
Journal of Fluid Mechanics , Volume 743 , 25 March 2014 , pp. 32 - 59
Copyright
© 2014 Cambridge University Press 

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