The University of Osaka · Engineering
Professor Kimiaki Washino's research lab specializes in computational modeling and simulation of particulate systems, with a focus on advanced numerical methods for fluid-particle and particle-particle interactions. The lab develops and applies innovative coupling techniques such as CFD–DEM and immersed boundary methods to simulate complex granular and multiphase flows in industrial processes like fluidized beds, wet granulation, and powder compaction. A key emphasis is placed on improving simulation accuracy and efficiency through non-local rheology, model particle approaches, and realistic representations of particle surface properties and cohesive forces.
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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