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Numerical modeling of sediment transport based on unsteady and steady flows by incompressible smoothed particle hydrodynamics method

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Journal of Hydrodynamics 2018年第5期30卷 928-942页

作者： rasoul memarzadeh Gholamabbas Barani Mahnaz Ghaeini-Hessaroeyeh Department of Civil Engineering Faculty of Engineering Shahid Bahonar University of Kerman Department of Civil Engineering Faculty of Engineering Vali-e-Asr University of Rafsanjan

The purpose of the present paper is to introduce a simple two-part multi-phase model for the sediment transport problems based on the incompressible smoothed particle hydrodynamics（ISPH） method. The proposed model simulates the movement of sediment particles in two parts. The sediment particles are classified into three categories, including the motionless particles, moving particles behave like a rigid body, and moving particles with a pseudo fluid behavior. The criterion for the classification of sediment particles is the Bingham rheological model. Verification of the present model is performed by simulation of the dam break waves on movable beds with different conditions and the bed scouring under steady flow condition. Comparison of the present model results, the experimental data and available numerical results show that it has good ability to simulate flow pattern and sediment transport.

关键词： Sediment transport Bingham model dam break incompressible smoothed particle hydrodynamics (ISPH) method steady and unsteady flows two-part multi-phase model

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

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Frontiers of Structural and Civil Engineering 2018年第3期12卷 412-424页

作者： rasoul memarzadeh Gholamabbas BARANI Mahnaz GHAEINI-HESSAROEYEH Department of Civil Engineering Faculty of Engineering Shahid Bahonar University of Kerman Kerman Iran

The subject of present study is the application of mesh free Lagrangian two-dimensional non-cohesive sediment transport model applied to a two-phase flow 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.

关键词： WCSPH method non-cohesive sediment transport rheological model two-part technique two-phase dam break

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