A three-dimensional distinct element model for bed-load transport

Yeganeh-Bakhtiary, Abbas, Shabani, Behnam, Gotoh, Hitoshi and Wang, Sam S. Y. (2009) A three-dimensional distinct element model for bed-load transport. Journal of Hydraulic Research, 47 2: 203-212. doi:10.3826/jhr.2009.3168

Author Yeganeh-Bakhtiary, Abbas
Shabani, Behnam
Gotoh, Hitoshi
Wang, Sam S. Y.
Title A three-dimensional distinct element model for bed-load transport
Journal name Journal of Hydraulic Research   Check publisher's open access policy
ISSN 0022-1686
Publication date 2009
Year available 2009
Sub-type Article (original research)
DOI 10.3826/jhr.2009.3168
Volume 47
Issue 2
Start page 203
End page 212
Total pages 10
Editor W.H. Hager
Place of publication Madrid, Spain
Publisher Int. Assoc. Hydraulic Research
Collection year 2010
Language eng
Subject C1
970109 Expanding Knowledge in Engineering
091501 Computational Fluid Dynamics
091103 Ocean Engineering
091504 Fluidisation and Fluid Mechanics
091599 Interdisciplinary Engineering not elsewhere classified
Abstract A three-dimensional model is developed to simulate bed-load transport using Distinct Element Method (DEM). The model describes the bed-load transport as dynamically interdependent motions of individual sediment particles under the flow action. A steady logarithmic velocity distribution over the flow depth is considered to represent fluid motion, while turbulent intensities are also included within the closure model. The present model accounts for both fluid-particle and particle-particle interactions, which are the predominant micro-mechanisms of bed-load transport under low and high tractive forces, respectively. Characteristic features of bed-load transport, previously reported by experimental observations, are numerically reproduced. The concept of vertical momentum transfer is exploited to describe features of concurrently present of saltation and sheet-flow layers. It is concluded that the vertical motion of particles is not significantly active in sheet-flow layer and the particle momentum is preserved. Consequently the interparticle collisions is the predominant mechanism of bed-load transport at high fluid tractive forces.
Keyword Bed-load transport
Distinct Element Model (DEM)
Fluid-particle interaction
Particle-particle interaction
Two-phase flow
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Civil Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 24 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 03 Sep 2009, 07:59:39 EST by Mr Andrew Martlew on behalf of School of Civil Engineering