DEVELOPMENT OF PARTICLE-BASED NUMERICAL WAVE FLUME FOR MULTIPHASE FLOW SIMULATION

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  • 高精度粒子法を用いた高機能型数値波動水槽の開発
  • コウセイド リュウシホウ オ モチイタ コウキノウガタ スウチ ハドウ スイソウ ノ カイハツ

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Abstract

 In recent years, a numerical design for the coastal engineering problem, namely, the so-called numerical wave flume is widely used and expected to expand its potential more as an ancillary or substitute tool for hydraulic experiments. However, for the time being, the numerical wave flume is limited in versatility for the actual engineering problems as the request level of coastal designs is increasing. In this study, a numerical wave flume based on the accurate particle method with a DEM coupling model, namely, parisphere is newly developed for accurate and stable simulations of the violent free-surface multiphase flows. First, a simple benchmark is performed by targeting a sedimentation of heavier particles in the water to examine the numerical accuracy of the model. The parisphere shows a good reproducibility in the motions of particles with an improvement of the energy conservation. Second, a simulation of a complex damaging process of a breakwater, which includes solid-liquid multiphase flows, is implemented. By comparing with the experimental results, it is found that parisphere can reproduces the complex phenomenon with satisfying the prudent requirements, that is, expression of solid-solid/solid-liquid interactions, porosity of the mound, drifting of rigid bodies and accurate pressure distributions.

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