Numerical Modeling of Flow and Scour at Pipelines
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 5
Abstract
A numerical model for the description of fluid flow, and suspended and bed-load sediment transport, is presented. Density effects are included in the momentum (Reynolds) equations and in the turbulence (k and ε) equations. Changes in bed levels are calculated from sediment continuity, and the finite-element grid is adapted to the geometry. The Reynolds equations and the transport equation for suspended sediment are solved numerically using a Taylor-Galerkin finite-element method. The flow at a surface mounted cylinder in a steady flow is predicted in good agreement with experiments. Periodic vortex shedding from a cylinder placed above a rigid bed is predicted in good agreement with laboratory experiments, provided that sufficiently detailed grids (∼5,000 nodes) are used. Scour calculations are performed for a cylinder in a steady flow with its underside placed at the level of the original flat bed. Predicted scour at a pipeline in steady flow is in good agreement with laboratory measurements reported in the literature.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 125 • Issue 5 • May 1999
Pages: 511 - 523
History
Received: Nov 22, 1996
Published online: May 1, 1999
Published in print: May 1999
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