Three-Dimensional Numerical Model with Free Water Surface and Mesh Deformation for Local Sediment Scour
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134, Issue 4
Abstract
A numerical model for local sediment scour with free surface and automatic mesh deformation is constructed and numerical results are compared with experimental results. For the turbulence closure, the two equation model is used. Two interfaces (water and air, water and sediment) in the domain are captured with different approaches. The free surface of the flow is simulated with the volume of fluid (VOF) scheme, which is an Eulerian approach. A new method for the VOF scheme is proposed to reduce the computational time while retaining relative accuracy. The behavior of the water-sediment interface (bed) is captured with a moving-mesh method, which is a Lagrangian approach. The flow field is coupled with sediment transport (both bed load and suspended load) using a quasi-steady approach. Good results have been obtained using the current model. The flow field is similar to the one observed in experiments. Scour patterns are similar to the experimental data as well. Large computational times are needed for morphological simulation and parallel computation is used to accelerate this process. The results obtained from the model are promising.
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Acknowledgments
This research was supported by the Coastal Geosciences Program of the Office of Naval Research, Grant No. ONRN00014-05-1-0083. The writers gratefully thank Professor B. M. Sumer for his helpful discussion and suggestions. The computational resources provided by the National Center for Supercomputing Applications (NCSA) at University of Illinois at Urbana-Champaign are gratefully acknowledged.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134 • Issue 4 • July 2008
Pages: 203 - 217
Copyright
© 2008 ASCE.
History
Received: Jun 6, 2006
Accepted: Sep 4, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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