Resolved Simulation of a Granular-Fluid Flow with a Coupled SPH-DCDEM Model
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 9
Abstract
Debris flows represent some of the most relevant phenomena in geomorphological events. Because of the potential destructiveness of such flows, they are the subject of a vast amount of research. This paper addresses the need for a numerical model applicable to granular-fluid mixtures featuring high spatial and temporal resolution, and thus capable of resolving the motion of individual particles, including all interparticle contacts. The DualSPHysics meshless numerical implementation based on smoothed particle hydrodynamics (SPH) is expanded with a distributed-contact discrete-element method (DCDEM) in order to explicitly solve the fluid and solid phases. The specific objective is to test the SPH-DCDEM approach by comparing its results with experimental data. An experimental setup for stony debris flows in a slit check dam is reproduced numerically, where solid material is introduced through a hopper, assuring a constant solid discharge for the considered time interval. With each sediment particle possibly undergoing several simultaneous contacts, thousands of time-evolving interactions are efficiently treated because of the model’s algorithmic structure and the HPC implementation of DualSPHysics. The results, composed of mainly retention curves, are in good agreement with the measurements, correctly reproducing the changes in efficiency with slit spacing and density.
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Acknowledgments
This research was partially supported by project RECI/ECM-HID/0371/2012, funded by the Portuguese Foundation for Science and Technology (FCT). The first author acknowledges FCT for his Ph.D. grant, SFRH/BD/75478/2010. It was also partially funded by Xunta de Galicia under project Programa de Consolidación e Estructuración de Unidades de Investigación Competitivas (Grupos de Referencia Competitiva), financed by the European Regional Development Fund (FEDER) and Ministerio de Economía y Competitividad under Project BIA2012-38676-C03-03. The experimental activity was part of the R & D project STOPDEBRIS, which was funded by QREN and developed by a multidisciplinary team from AQUALOGUS, Engenharia e Ambiente, in partnership with CEris-IST. The authors acknowledge Miguel Silva from AQUALOGUS for providing the data.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 23, 2015
Accepted: Feb 22, 2017
Published online: May 31, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 31, 2017
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