Numerical analysis of secondary-flow around a spur dike using a three-dimensional free water surface LES model

R. Akahori, Mark Schmeeckle

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Accurate calculation of secondary flows is critical for the accurate calculation of the sediment transport field in topographically-induced non-uniform flows, and thus the morphodynamic evolution of a river, because the secondary flow can significantly change the direction of the near-bed flow and sediment transport as compared to the vertically-averaged velocity vector. In this study, a non-hydrostatic, free water-surface, three-dimensional, numerical model is developed for flow around a spur dike. The model employs a Body Fitted Coordinate (BFC) system and a moving grid system. These methods enable the model to fit the grid to the boundary during free water surface fluctuations. Turbulence larger than the scale of the grid is modeled by the Large Eddy Simulation (LES) technique. LES integrates the spatially-filtered Navier-Stokes equations, which means that time-fluctuating components of secondary flows are numerically calculated. Model results are compared to those of existing experiments around spur dikes.

Original languageEnglish (US)
Title of host publicationRiver, Coastal and Estuarine Morphodynamics
Subtitle of host publicationRCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Pages921-930
Number of pages10
StatePublished - Dec 1 2006
Event4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005 - Urbana, IL, United States
Duration: Oct 4 2005Oct 7 2005

Publication series

NameRiver, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Volume2

Other

Other4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005
CountryUnited States
CityUrbana, IL
Period10/4/0510/7/05

ASJC Scopus subject areas

  • Ecological Modeling
  • Environmental Chemistry

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    Akahori, R., & Schmeeckle, M. (2006). Numerical analysis of secondary-flow around a spur dike using a three-dimensional free water surface LES model. In River, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics (pp. 921-930). (River, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics; Vol. 2).