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

Details

Serval ID
serval:BIB_E6BC51D7CC42
Type
Article: article from journal or magazin.
Collection
Publications
Title
Development and testing of a numerical code for treatment of complex river channel topography in three-dimensional CFD models with structured grids
Journal
JOURNAL OF HYDRAULIC RESEARCH
Author(s)
Hardy RJ, Lane SN, Lawless MR, Best JL, Elliott L, Ingham DB
ISSN
0022-1686
Publication state
Published
Issued date
2005
Volume
43
Number
5
Pages
468-480
Notes
ISI:000234808500003
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 (P = 1 for cells that are all water, P = 0 for cells
that are all bed and 0 < P < 1 for partly blocked cells) with
appropriate drag terms introduced into the momentum equations. This
method has the distinct advantages of minimizing grid distortion and
increasing the ease of numerical solution. A validation exercise is
presented that is based upon two separate flume experiments using
digital particle imaging velocimetry to collect velocity measurements
of (i) flow around a cube; and (ii) a simulation of a simplified
representation of bed roughness. These results are considered against
simulations based upon previous treatments of complex topography,
notably in relation to roughness parameterization.
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Create date
03/02/2011 14:41
Last modification date
20/08/2019 16:09
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