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Shallow flow simulation on dynamically adaptive cut cell quadtree grids

Lookup NU author(s): Professor Qiuhua Liang

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Abstract

A computationally efficient, high-resolution numerical model of shallow flow hydrodynamics is described, based on dynamically adaptive quadtree grids. The numerical model solves the two-dimensional non-linear shallow water equations by means of an explicit second-order MUSCL-Hancock Godunov-type finite volume scheme. Interface fluxes are evaluated using an HLLC approximate Riemann solver. Cartesian cut cells are used to improve the fit to curved boundaries. A ghost-cell immersed boundary method is used to update flow information in the smallest cut cells and overcome the time step restriction that would otherwise apply. The numerical model is validated through simulations of reflection of a surge wave at a wall, a low Froude number potential flow past a circular cylinder, and the shock-like interaction between a bore and a circular cylinder. The computational efficiency is shown to be greatly improved compared with solutions on a uniform structured grid implemented with cut cells. Copyright © 2006 John Wiley & Sons, Ltd.

Publication metadata

Author(s): Liang Q, Zang J, Borthwick AGL, Taylor PH

Publication type: Article

Publication status: Published

Journal: International Journal for Numerical Methods in Fluids

Year: 2007

Volume: 53

Issue: 12

Pages: 1777-1799

ISSN (print): 0271-2091

ISSN (electronic): 1097-0363

Publisher: John Wiley & Sons Ltd.

URL: http://dx.doi.org/10.1002/fld.1363

DOI: 10.1002/fld.1363

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