渦法を用いた固気二相流の二次元グリッドフリー解法(<小特集>多相(混相)系における新しい計測とシミュレーション)

概要

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This study proposes a two-dimensional grid-free simulation method for gas-particle two-phase flow. The method is based on a vortex method, in which the vorticity field is discretized by vortex elements. The behavior of vortex element and.the particle motion are simultaneously computed by the Lagrangian approach. Four square cells are allocated around each particle. In each cell, the change in the circulation of gas-phase due to the particle motion is calculated, and it is considered through the change in the strength of vortex element. The grid-free method is applied to simulate the particulate jet generated by small glass particles falling from a slit orifice into an unbounded quiescent air. It is shown that the simulated distribution of air velocity is favorably compared with the measurement. It is also confirmed that the entrained air flow rate agrees well with the prediction by an analytical model. These results suggest the validity of the method.
2008-06-25