Numerical limitations of hydraulic models

Toombes, Luke and Chanson, Hubert (2011). Numerical limitations of hydraulic models. In: Eric Valentine, Colin Apelt, James Ball, Hubert Chanson, Ron Cox, Robert Ettema, George Kuczera, Martin Lambert, Bruce Melville and Jane Sargison, Proceedings of the 34th IAHR World Congress. 34th IAHR World Congress, 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering, Brisbane, Australia, (2322-2329). 26 June - 1 July 2011.

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Name Description MIMEType Size Downloads
Author Toombes, Luke
Chanson, Hubert
Title of paper Numerical limitations of hydraulic models
Conference name 34th IAHR World Congress, 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering
Conference location Brisbane, Australia
Conference dates 26 June - 1 July 2011
Proceedings title Proceedings of the 34th IAHR World Congress
Place of Publication Brisbane, Australia
Publisher Engineers Australia
Publication Year 2011
Sub-type Fully published paper
ISBN 9780858258686
Editor Eric Valentine
Colin Apelt
James Ball
Hubert Chanson
Ron Cox
Robert Ettema
George Kuczera
Martin Lambert
Bruce Melville
Jane Sargison
Start page 2322
End page 2329
Total pages 8
Collection year 2012
Language eng
Abstract/Summary Fluid motion is controlled by the basic principles of conservation of mass, energy and momentum, which form the basis of fluid mechanics and hydraulic engineering. Complex flow situations must be solved using empirical approximations and numerical models, which are based on derivations of the basic principles (backwater equation, Navier-Stokes equation etc). All numerical models are required to make some form of approximation to solve these principles, and consequently all have their limitations. Sadly, these limitations are usually neither advertised by the software developers, nor investigated and understood by the users. The consequences of misusing a model can be catastrophic. This paper presents a brief explanation of the backwater and Navier-Stokes equations, and examines the use of these equations in the context of several leading software packages. The major assumptions and approximations implicit in both the base equations and numerical models are identified, together with the limitations that these impose. The validity of the numerical models is then examined in a number of situations, including verification of the model predictions against physical model data.
Keyword Basic equations
Numerical modelling
Physical modelling
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Conference theme - Balance and Uncertainty: Water in a Changing World

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2012 Collection
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Created: Sun, 03 Jul 2011, 13:45:35 EST by Hubert Chanson on behalf of School of Civil Engineering