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Numerical and Experimental Study of Erosion in Open Channel Flow

Author(s): Klemens Gruber; Christoph Kloss; Christoph Goniva

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Abstract: A new numerical model at particle-scale is proposed to simulate the erosion process in the presence of a free surface flow. The fluid flow is captured by a Computational Fluid Dynamics (CFD) method, where the sediment is modelled at a grain size level using Discrete Element Method (DEM). Its interaction is realized by a coupling of CFD and DEM. This Lagrangian approach allows capturing the physics of sediment erosion and deposition at a very detailed particle-scale level. The model is realized in an Open Source environment, based on OpenF OAM? and LIGGGHTS. Furthermore, the numerical simulations are tested against experimental work on sediment erosion downstream of a hydraulic structure. With the aid of optical and acoustic measurement techniques (PIV, ADV) the fluid flow is captured in the experiment, where bed deformation is captured by a LASER based measuring device. It is shown that the proposed numerical approach is suitable to correctly predict local erosion.


Year: 2012

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