GSMAC-FEMによる大口径CZ法融液内の熱流動のLES解析(流体工学,流体機械)

Three-dimensional numerical simulations in the large-scale CZ method are carried out to investigate the complicated melt flow. Large Eddy Simulation (LES) is adopted to calculate unsteady, turbulent buoyancy-driven flow fields. When the crucible and the crystal keep static, the melt flow becomes non-axisymmetrical as the temperature of the crucible wall increases because of the instability of the potential energy, and finally it turns out to be turbulent. The oscillation of velocity in the circumferential direction is also observed near the free surface, and it causes the mode transition in the temperature field. On the other hand, when the crucible and the crystal rotate constantly, the natural convection driven by the buoyancy is greatly suppressed because of the large magnitude of Coriolis' force, and the forced convection dominates the flow field.