THREE-DIMENSIONAL NUMERICAL ANALYSIS OF SEDIMENT TRANSPORT AROUND ABUTMENTS IN CHANNEL BEND

Han Sang Kim, Hamn-Ching Chen

Abstract


In this paper, the results for sediment transport simulation around bridge abutments in a channel bend are presented. Computational Fluid Dynamics code FANS3D is used to conduct the study, which solves three-dimensional Reynolds- Averaged Navier-Stokes equations with the finite analytic scheme. The two-layer turbulence model, which combines the one- and two-equation eddy-viscosity models, is utilized to resolve turbulence near smooth solid surfaces. The wall- function approach is adopted to take into account the roughness effects in case of sediment beds. For velocity-pressure coupling, PISO/SIMPLER algorithms are used. Chimera technique is utilized to embed non-matching blocks in the computational domain. The numerical model coupled with the sediment transport module was validated with experimental studies. For the present case, the transport of suspended sediment in a 90°-channel bend with abutments located in the middle was simulated. Sediment plume in a swirl was observed downstream of the abutments.

Keywords


sediment transport; computational fluid dynamics; abutment scouring

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References


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DOI: https://doi.org/10.9753/icce.v34.sediment.21