Computational fluid dynamics modelling of boundary roughness in gravel-bed rivers : an investigation of the effects of random variability in bed elevation

Auteur :
NICHOLAS, A.P.

Description :
Results from a series of numerical simulations of two-dimensional open channel flow, conducted using the computational fluid dynamics (CFD) code FLUENT, are compared with data quantifying the mean and turbulent characteristics of open-channel flow over 2 contrasting gravel beds. The aims of this study are : to assess the performance of the CFD model; to identify the limitations of the conventional wall function approach; to explore the potential for modelling intermediate-scale roughness effects using a random elevation model, and to address the wider implications of these results for the application of CFD models to natural gravel-bed channels.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2001, vol. 26, n°. 4, p. 345-362, Collation : Illustration, Références bibliographiques : 44 ref.

Date :
2001

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley