三维熔体前沿界面的Level Set追踪

Level Set method for 3D melt front surface

给出三维Level Set方程,采用五阶加权本质无振荡格式进行空间离散,通过算例验证了该算法的正确性及追踪三维运动界面的准确性。进而将Level Set算法和同位网格有限体积法进行耦合,模拟了注塑成型充填阶段的三维流动过程,准确追踪到了不同时刻熔体前沿界面,预测并分析了流动过程中不同时刻的压力、速度等重要流动特征。数值结果表明,该方法可追踪三维熔体前沿界面,预测充填过程中的重要流动特征。

The 3D Level Set equations were introduced, which were discretized in space by the fifth order weighted essentially non-oscillatory scheme. Its accuracy was proven through capturing 3D moving interface. The governing equations were established for the viscous, incompressible, Newtonian fluids, which were discretized by the finite volume method based on non-staggered grid. The problem of the pressure-velocity decoupling was solved by the algorithm of momentum interpolation （MI） . The 3D flow process of injection molding was simulated by coupling the Level Set method and the finite volume method based on non-staggered grid, which can precisely capture the front surface of melt and predict the flow features, such as pressure and velocity at different times. The results indicated that the method can capture 3D front surface of melt and predict the flow features in injection process.