气辅注射成型运动界面的Level Set方法数值模拟

Numerical simulation of moving interfaces in gas-assisted injection molding process by Level Set approach

给出气液两相流数学模型,选取Cross-WLF模型作为熔体的黏度模型,采用Level Set/SIMPLEC方法模拟了气体辅助注射成型中气体穿透过程,追踪到了不同时刻的运动界面(气熔界面和熔体前沿界面),描述了运动过程中不同时刻速度和温度等重要物理量的分布情况,分析了熔体温度、气体延迟时间和注射压力对气体穿透时间和穿透长度的影响。数值结果表明,Level Set/SIMPLEC方法可以准确追踪气体穿透过程中的两个运动界面;熔体温度、延迟时间和气体注射压力对气体穿透长度有显著影响。

The mathematical models of gas-liquid two-phase flow were presented, and the Cross-WLF model was selected as the viscosity model of the melt. The gas penetration process was simulated by using the Level Set/SIMPLEC methods, which could capture the moving interfaces at different times, including the gas-melt interface and the front of the melt. The physical features, such as velocity and temperature at different times were described. The influences of melt temperature, gas delay time and injection pressure on gas penetration time and penetration length were analyzed. The numerical results showed that the Level Set/SIMPLEC methods could precisely trace the two moving interfaces in the gas penetration process and the penetration length was affected significantly by melt temperature, gas delay time and injection pressure.