Abstract

The vertical 2D movable bed simulator, which has been a key tool of the computational mechanics of sediment transport, has a limitation in describing some of details of sediment transport phenomena. Because all of sediment particles have their center of gravity on the same vertical plane, the 2D model cannot describe the effect of the particles existing in an external space of the calculated vertical plane. This limitation of 2D model brings some problems, which comes from a geometrical arrangement of particles, especially on the simulation of grain sorting. The framework of 3D movable bed simulator, which is based on the distinct element method, is shown herein. A dam-up process of sediment body moving on a uniform slope by fixed vertical columns is simulated to show some part of performance of the present model.

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