固気二相流に対する三次元グリッドフリー渦法(流体工学,流体機械)

概要

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Three-dimensional grid-free vortex method for particle-laden gas flow is proposed. The flow region is not resolved into computational grids, but the gas vorticity field is discretized by vortex elements. The behavior of vortex element and the particle motion are simultaneously simulated with the Lagrangian approach. Eight cubic cells are allocated around each particle to compute the effect of the particle on the gas flow. In each cell, the change in the vorticity 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 a free falling of small spherical solid particles. The particles initially arranged within a spherical region are made to fall in air. It is demonstrated that a downward air flow induced by the falling particles accelerates the particles at the commencement of the fall and that a vortex ring produced around the downward air flow heaves up the particles. These are in good agreement with the existing results, indicating the validity of the present grid-free method.
2009-02-25