Numerical modeling of bedform development in turbulent flows

Quoc Y. Nguyen

ISBN 10: 365913080X / ISBN 13: 9783659130809

Published by LAP Lambert Academic Publishing Nov 2016, 2016

About this Item

Neuware -Development of river bedform under interactions with water flows is a complex process due to turbulence of the flow and continuous change of bed geometry. In this study, the problem was examined by numerical computations. Two latest advanced tools of Computational Fluid Mechanics, namely Large-Eddy-Simulation and Immersed-Boundary-Method, were employed. Flows were turbulent at low Reynolds number and treated in three-dimensions. Bed surfaces was treated as continuos medium rather than individual sediment particles. The results showed strong correlations between change of the bed surface and the shear tress applied by the flows. Development of bedform from initially flat bed to full-size sandwaves had been observed from the computations. Experimentally observed phenomena, such as development of ripple train, was also successfully reproduced.Books on Demand GmbH, Überseering 33, 22297 Hamburg 140 pp. Englisch.

Seller Inventory # 9783659130809

Bibliographic Details

• Title: Numerical modeling of bedform development in turbulent flows
• Publisher: LAP Lambert Academic Publishing Nov 2016
• Publication Date: 2016
• Language: English
• ISBN 10: 365913080X
• ISBN 13: 9783659130809
• Binding: Taschenbuch
• Condition: Neu

About this title

Synopsis

Development of river bedform under interactions with water flows is a complex process due to turbulence of the flow and continuous change of bed geometry. In this study, the problem was examined by numerical computations. Two latest advanced tools of Computational Fluid Mechanics, namely Large-Eddy-Simulation and Immersed-Boundary-Method, were employed. Flows were turbulent at low Reynolds number and treated in three-dimensions. Bed surfaces was treated as continuos medium rather than individual sediment particles. The results showed strong correlations between change of the bed surface and the shear tress applied by the flows. Development of bedform from initially flat bed to full-size sandwaves had been observed from the computations. Experimentally observed phenomena, such as development of ripple train, was also successfully reproduced.

About the Author

Dr. Nguyen Quoc Y obtained his PhD degree at Ritsumeican University (Japan) in 2008. He currently works at Ho Chi Minh City University of Technology in Vietnam. His research interests are in civil and environmental fluid mechanics by both computations and experiments.