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

Pham Van Bang, Damien ORCID: https://orcid.org/0000-0001-8669-0724; Uh Zapata, Miguel; Gauthier, Georges; Gondret, Philippe; Zhang, Wei et Nguyen, Kim Dan (2022). Two-Phase Flow Modeling for Bed Erosion by a Plane Jet Impingement. Water , vol. 14 , nº 20. p. 3290. DOI: 10.3390/w14203290.

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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.

Type de document:	Article
Mots-clés libres:	jet erosion test; sediment transport; numerical modeling; two-phase flow model; experiments; water injection dredging
Centre:	Centre Eau Terre Environnement
Date de dépôt:	17 mai 2023 15:05
Dernière modification:	17 mai 2023 15:05
URI:	https://espace.inrs.ca/id/eprint/13306

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