Bed Shear Stress Boundary Condition for Storage Tank Sedimentation
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Volume 129, Issue 7
Abstract
Computational fluid dynamics-based (CFD) software tools enable engineers to simulate flow patterns and sediment transport in ancillary structures of sewer systems. Lagrangian particle tracking represents a computationally efficient technique for modeling sediment transport. In order to represent the process of sedimentation in storage tanks, careful consideration must be given to the boundary condition at the bottom of the tanks. None of the boundary conditions currently available in the FLUENT CFD software appears to represent the observed behavior of sediment particles, which may become resuspended after first contact with the bed if the local flow velocity is sufficiently high. In this study, a boundary condition based on bed shear stress has been implemented in FLUENT and evaluated against laboratory data. A particle is trapped if the local bed shear stress is below the critical bed shear stress; otherwise, the particle is resuspended. The approach gives satisfactory agreement with measured sedimentation efficiency data, and the simulated spatial distribution is very similar to the sediment distribution observed in a laboratory tank.
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Information
Published In
Journal of Environmental Engineering
Volume 129 • Issue 7 • July 2003
Pages: 651 - 658
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jul 23, 2001
Accepted: Sep 13, 2002
Published online: Jun 13, 2003
Published in print: Jul 2003
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