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Development and testing of a numerical code for treatment of complex river channel topography in three-dimensional CFD models with structured grids

Hardy, R.J.; Lane, S.N.; Lawless, M.R.; Best, J.L.; Elliott, L.; Ingham, D.B.

Authors

S.N. Lane

M.R. Lawless

J.L. Best

L. Elliott

D.B. Ingham



Abstract

The potential for using high-resolution numerical modelling to understand flow over complex rough heterogeneous surfaces has yet to be fully realized, largely due to problems of designing numerically stable meshes for use with complex bed geometries. Representation of such geometries has tended to rely upon sub-grid scale treatments involving roughness parameterization within numerical schemes. This paper develops, verifies and validates a technique for dealing with the representation of complex bed geometries within a basic numerical scheme. The method is based upon a numerical porosity treatment, which uses a structured grid but specifies cell porosities to block out bottom topography ( =1 for cells that are all water, P =0 for cells that are all bed and 0

Citation

Hardy, R., Lane, S., Lawless, M., Best, J., Elliott, L., & Ingham, D. (2005). Development and testing of a numerical code for treatment of complex river channel topography in three-dimensional CFD models with structured grids. Journal of Hydraulic Research, 43(5), 468-480

Journal Article Type Article
Publication Date 2005
Deposit Date Nov 14, 2006
Journal Journal of Hydraulic Research
Print ISSN 0022-1686
Electronic ISSN 1814-2079
Publisher Taylor and Francis Group
Peer Reviewed Peer Reviewed
Volume 43
Issue 5
Pages 468-480
Keywords Porosity algorithm, CFD, Boundary roughness, DPIV.
Publisher URL http://www.journalhydraulicresearch.com/