Suspension of sediment particles over a ripple due to turbulent convection under unsteady flow conditions SCIE SCOPUS KCI

Cited 4 time in WEB OF SCIENCE Cited 4 time in Scopus
Title
Suspension of sediment particles over a ripple due to turbulent convection under unsteady flow conditions
Author(s)
Chang, Yeon S.; Park, Young-Gyu
KIOST Author(s)
Chang, Yeon S.(장연식)Park, Young Gyu(박영규)
Publication Year
2016-03
Abstract
We analyzed the motions of small sediment particles over a sinusoidal ripple due to an unsteady turbulent boundary layer flow using Large Eddy Simulation. The motions of sediment particles are described in terms of the Lagrangian framework as it is helpful in studying the structure of sediment suspension in detail. Strong coherent vortical structures are well developed along the upslope of the ripple surface during the accelerating flow phase, which effectively drag the particles to the ripple crest. At the maximum flow rate and at the decelerating flow phase, a cloud of vortical structures is developed vertically in the lee area of the ripple. Sediment particles render strong dispersion in the vertical direction when they are captured by these turbulent vortices, causing convective sediment flux that cannot be explained by the mean flows. The convective sediment suspension is strongest at the time of flow deceleration, while over a flat bed at the time of flow reversal. This observation suggests that bed form effect should be considered in modeling convective sediment flux.
ISSN
1738-5261
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2229
DOI
10.1007/s12601-016-0011-2
Bibliographic Citation
OCEAN SCIENCE JOURNAL, v.51, no.1, pp.127 - 135, 2016
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Subject
LARGE-EDDY SIMULATION; OSCILLATORY FLOW; BOUNDARY-LAYERS; NUMERICAL-SIMULATION; CHANNEL FLOW; TRANSPORT; WAVES
Keywords
sediment transport; sediment suspension model; turbulent structures; ripple; convective sediment motion; Lagrangian particle motion; large eddy simulation
Type
Article
Language
English
Document Type
Article
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Related Researcher
Research Interests

ocean circulation,ocean mixing,marine debris,해양순환,해양혼합,해양부유물

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