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Numerical simulation for coastal morphodynamics using DEM-MPS method
Highlights By using a three-dimensional DEM-MPS model, the morphodynamics in the segregating ripple formation process was investigated in detail from the perspective of grain size scale. Ripples formed by segregated coarse particles promote momentum exchange on the movable bed surface more than before segregation. The apparent volume change was incorporated to a fluid particle inside a moving and deforming solid-sediment layer. A water surface change was simulated accurately by using apparent volume change in a solitary wave simulation induced by a landslide of DEM particles.
Abstract Numerical simulations were performed for morphodynamics with free water surface fluctuation using the DEM-MPS method, which employs the discrete element method (DEM) and the enhanced moving particle semi-implicit (MPS) method for the solid and liquid phases, respectively. The reproducibility of the DEM-MPS method to a swash ripple formation process of a mixed grain bed is demonstrated. There, the bed is fully covered with water, and its void is filled with pore water. It is suggested that the ripple formation with coarse-grained particles activates the momentum exchange in the surface layer of the movable bed. In addition, a numerical simulation for a solitary wave induced by a landslide by DEM solid particles was carried out. Here, the applicability of the model in the situation where the pore water surface exists in a moving and deforming solid-sediment layer is examined. The simulation results show that it is essential to apply the apparent volume to a fluid particle inside a solid-sediment layer to predict the water surface evolution accurately.
Numerical simulation for coastal morphodynamics using DEM-MPS method
Highlights By using a three-dimensional DEM-MPS model, the morphodynamics in the segregating ripple formation process was investigated in detail from the perspective of grain size scale. Ripples formed by segregated coarse particles promote momentum exchange on the movable bed surface more than before segregation. The apparent volume change was incorporated to a fluid particle inside a moving and deforming solid-sediment layer. A water surface change was simulated accurately by using apparent volume change in a solitary wave simulation induced by a landslide of DEM particles.
Abstract Numerical simulations were performed for morphodynamics with free water surface fluctuation using the DEM-MPS method, which employs the discrete element method (DEM) and the enhanced moving particle semi-implicit (MPS) method for the solid and liquid phases, respectively. The reproducibility of the DEM-MPS method to a swash ripple formation process of a mixed grain bed is demonstrated. There, the bed is fully covered with water, and its void is filled with pore water. It is suggested that the ripple formation with coarse-grained particles activates the momentum exchange in the surface layer of the movable bed. In addition, a numerical simulation for a solitary wave induced by a landslide by DEM solid particles was carried out. Here, the applicability of the model in the situation where the pore water surface exists in a moving and deforming solid-sediment layer is examined. The simulation results show that it is essential to apply the apparent volume to a fluid particle inside a solid-sediment layer to predict the water surface evolution accurately.
Numerical simulation for coastal morphodynamics using DEM-MPS method
Harada, Eiji (author) / Ikari, Hiroyuki (author) / Tazaki, Takumi (author) / Gotoh, Hitoshi (author)
Applied Ocean Research ; 117
2021-10-01
Article (Journal)
Electronic Resource
English
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