大阪大学 · 工学
Kimiaki Washino教授の研究室では、粉体・粒子系の数値シミュレーションを核として、離散要素法（DEM）やCFD-DEM連成法を用いた多相流動・粉体プロセスの解析を進めています。特に、微粒子・凝集性粉体の密着状態や液滴の分布挙動、非局所効果や相似条件に基づくスケーリング手法の開発が主な研究テーマです。実規模のプロセスシミュレーションを可能にする高精度で計算コストに配慮したモデル開発が目指されています。
Figures are computed from collected data and may differ slightly.
Discrete Element Method (DEM) is widely applied to the numerical simulations of fluidized beds. However, the computational expense increases explosively as the number of particles increases. This issue hinders DEM from being applied to real-scale simulations. A model particle is sometimes employed in order to overcome this problem, in which real particles are replaced by larger model particles. When the model particle is used, some conditions (e. g., superficial velocity, gas density, gas viscos
A resolved CFD–DEM coupling model for the simulation of particulate flows is proposed in this work. The Volume Penalisation (VP) method, which is a family of the continuous forcing Immersed Boundary (IB) method, is employed to express the particle–fluid interaction. A smooth mask function is used to avoid sharp transition between the solid (particle) and fluid domains that may cause numerical oscillation with moving particles. Optimal permeability is employed to reduce the model error associated
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