Application of a weakly compressible smoothed particle hydrodynamics multi-phase model to non-cohesive embankment breaching due to flow overtopping

• Published in: Frontiers of Structural and Civil Engineering Vol. 12; no. 3; pp. 412 - 424
• Main Authors: MEMARZADEH, Rasoul, BARANI, Gholamabbas, GHAEINI-HESSAROEYEH, Mahnaz
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.09.2018; Springer Nature B.V
• Subjects: Cities; Civil Engineering; Cohesive sediments; Compressibility; Computational fluid dynamics; Computer applications; Computer simulation; Countries; Data processing; Engineering; Finite element method; Fluid flow; Fluid mechanics; Hydrodynamics; Mathematical models; Multiphase flow; Navier-Stokes equations; non-cohesive sediment transport; Regions; Research Article; rheological model; Sediment transport; Shear stress; Simulation; Smooth particle hydrodynamics; Stokes law (fluid mechanics); Two dimensional models; Two phase flow; two-part technique; two-phase dam break; Viscosity; WCSPH method; two-phase dam break; WCSPH method; non-cohesive sediment transport; rheological model; two-part technique
• ISSN: 2095-2430; 2095-2449
• DOI: 10.1007/s11709-017-0432-8

The subject of present study is the application of mesh free Lagrangian two-dimensional non-cohesive sediment transport model applied to a two-phase ow over an initially trapezoidal-shaped sediment embankment. The governing equations of the present model are the Navier-Stocks equations solved using Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) method. To simulate the movement of sediment particles, the model considers a powerful two-part technique; when the sediment phase has rigid behavior, only the force term due to shear stress in the Navier-Stokes equations is used for simulation of sediment particles' movement. Otherwise, all the Navier-Stokes force terms are used for transport simulation of sediment particles. In the present model, the interactions between different phases are calculated automatically, even with considerable difference between the density and viscosity of phases. Validation of the model is performed using simulation of available laboratory experiments, and the comparison between computational results and experimental data shows that the model generally predicts well the flow propagation over movable beds, the induced sediment transport and bed changes, and temporal evolution of embankment breaching.