3D Unsteady RANS Modeling of Complex Hydraulic Engineering Flows. I: Numerical Model
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Volume 131, Issue 9
Abstract
A general-purpose numerical method is developed for solving the full three-dimensional (3D), incompressible, unsteady Reynolds-averaged Navier-Stokes (URANS) equations in natural river reaches containing complex hydraulic structures at full-scale Reynolds numbers. The method adopts body-fitted, chimera overset grids in conjunction with a grid-embedding strategy to accurately and efficiently discretize arbitrarily complex, multiconnected flow domains. The URANS and turbulence closure equations are discretized using a second-order accurate finite-volume approach. The discrete equations are integrated in time via a dual-time-stepping, artificial compressibility method in conjunction with an efficient coupled, block-implicit, approximate factorization iterative solver. The computer code is parallelized to take full advantage of multiprocessor computer systems so that unsteady solutions on grids with nodes can be obtained within reasonable computational time. The power of the method is demonstrated by applying it to simulate turbulent flow at in a stretch of the Chattahoochee River containing a portion of the actual bridge foundation located near Cornelia, Georgia. It is shown that the method can capture the onset of coherent vortex shedding in the vicinity of the foundation while accounting for the large-scale topographical features of the surrounding river reach.
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Acknowledgments
This work was supported by a grant from the Georgia Department of Transportation and by National Science Foundation (NSF) Career award number 9875691. Partial support for this research was also provided by the Energy Efficiency and Renewable Energy Office of the U.S. Department of Energy, Wind and Hydropower Technologies Office.
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Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 9 • September 2005
Pages: 800 - 808
Copyright
© 2005 ASCE.
History
Received: Jan 22, 2004
Accepted: Dec 30, 2004
Published online: Sep 1, 2005
Published in print: Sep 2005
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