Assessing the credibility of a series of computational fluid dynamic simulations of open channel flow
Article first published online: 24 MAR 2003
Copyright © 2003 John Wiley & Sons, Ltd.
Volume 17, Issue 8, pages 1539–1560, 15 June 2003
How to Cite
Hardy, R. J., Lane, S. N., Ferguson, R. I. and Parsons, D. R. (2003), Assessing the credibility of a series of computational fluid dynamic simulations of open channel flow. Hydrol. Process., 17: 1539–1560. doi: 10.1002/hyp.1198
- Issue published online: 14 MAY 2003
- Article first published online: 24 MAR 2003
- Manuscript Accepted: 8 JUL 2002
- Manuscript Received: 28 NOV 2001
- NERC. Grant Number: GR3/9715
- Global Convergence Index;
Recent developments in numerical algorithms have enabled the construction of three-dimensional models for the prediction of flows in open channels. These advances encompass improvements in both numerical solutions and the process representation required for an accurate system definition. However, to date, there is still little agreement on how to assess systematically and report the credibility of these simulations. This paper addresses this problem by adopting a Grid Convergence Index approach. The results indicate, for two simple hypothetical cases, a zero-degree confluence and a meander bend, that the numerical code can be verified to an acceptable numerical standard. However, it is shown that this does not mean that verification is complete, as the literature implies, as whilst the discretization resolution may be sufficient to verify one of the model variables it does not imply that every variable has converged. Furthermore, the scheme may still be insufficient to capture all the processes of interest that are operating within the chosen environment. Copyright © 2003 John Wiley & Sons, Ltd.