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Article Dans Une Revue Water Année : 2022

Two-Phase Flow Modeling for Bed Erosion by a Plane Jet Impingement

Résumé

This paper presents experimental and numerical studies on the erosion of a horizontal granular bed by a two-dimensional plane vertical impinging jet to predict the eroded craters’ size scaling (depth and width). The simulations help understand the microscopic processes that govern erosion in this complex flow. A modified jet-bed distance, accounting for the plane jet virtual origin, is successfully used to obtain a unique relationship between the crater size and a local Shields parameter. This work develops a two-phase flow numerical model to reproduce the experimental results. The numerical techniques are based on a finite volume formulation to approximate spatial derivatives, a projection technique to calculate the pressure and velocity for each phase, and a staggered grid to avoid spurious oscillations. Different options for the sediment’s solid-to-liquid transition during erosion are proposed, tested, and discussed. One model is based on unified equations of continuum mechanics, others on modified closure equations for viscosity or momentum transfer. A good agreement between the numerical solutions and the experimental measurements is obtained.
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Dates et versions

hal-04354491 , version 1 (19-12-2023)

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Damien Pham-Van-Bang, Miguel Uh Zapata, Georges Gauthier, Philippe Gondret, Wei Zhang, et al.. Two-Phase Flow Modeling for Bed Erosion by a Plane Jet Impingement. Water, 2022, 14 (20), pp.3290. ⟨10.3390/w14203290⟩. ⟨hal-04354491⟩
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