1547 渦法による分散系固液二相内部流のシミュレーション

概要

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Vortex method provides grid-free Lagrangian simulation of unsteady, high Reynolds number and vortical flows without any conventional time-averaged turbulence models. Recently, vortex method is expected to extend to analyses of multiphase flows, because it is able to comprehend the interactions of particles with the vortex structures. However, there are few applications of vortex method for the internal unsteady multiphase flows, though many industrial flows are internal. For that purpose, we tried to apply the special combination of vortex method with particle trajectory tracking method to the internal unsteady two-phase flows of high Reynolds number. As the result, we successfully simulated the unsteady separation that occurred due to the influence of the adverse pressure gradient and the interaction between the shear layer and the wall. Calculation results of fluid flow field showed a good agreement with available experimental data. The results of the mixing process of the particle showed that large-scale vortices dominate the particle motion. The present study clarified the applicability of the completely grid-free Lagrangian-Lagrangian simulation to the internal unsteady multiphase flows.
一般社団法人日本機械学会の論文
2003-08-05