渦法と粒子追跡法による固液二相流解析の内部流への適用(流体工学,流体機械)

概要

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We developed a special combination of vortex method and particle trajectory tracking method, which is applicable to internal unsteady two-phase flows. This method is a completely grid-free Lagrangian-Lagrangian simulation, which is able to simulate interactions between particles and the fluid flow. This method provides calculation of unsteady, high Reynolds number and vortical flows without use of any conventional time-averaged turbulence models. However, there is no application of this kind of method to internal multiphase flows, though many industrial multiphase flows are internal. In this study, internal liquid-solid two-phase flows had been analyzed by the new method, in which use of vortex introduction model enables us to simulate the dynamic behavior of separation or reattachment vortices without assuming locations of separation point. Calculation results, which were simplified as one-way model, showed good agreements with the experimental data. The results of the mixing process of solid particles showed that vortices dominate particle motions. The present method can be useful in the design of industrial multiphase flows, because it is able to simulate the unsteady interaction of particles with turbulent vortex structures.
一般社団法人日本機械学会の論文
2005-11-25