In this paper, the intricate gas entrapment phenomenon in the non-isothermal polymer filling process is investigated via a combined finite element and discontinuous Galerkin numerical algorithm. The evolving melt interface is captured via level set method and the eXtended Pom-Pom (XPP) constitutive model is employed to describe the viscoelastic fluid. The governing equations of flow field are solved via a coupled continuous and discontinuous Galerkin method. The implicit discontinuous Galerkin method is utilized for the solution of the XPP constitutive equation, level set and its re-initialization equations. The good agreement of experimental and simulation results illustrates the validity of this combined computational algorithm. The influence of injection velocity and the gate size on the gas entrapment phenomenon are both studied in the irregular cavity with complex insert. We have found that the entrapped gas is easy to appear for the case of higher injection velocity and smaller gate size. The distribution of temperature field in different cases are also shown.

本文通过结合有限元和非连续伽辽金数值算法研究了非等温聚合物填充过程中复杂的气体夹带现象。通过水平集方法捕获不断变化的熔体界面，并采用扩展 Pom-Pom (XPP) 本构模型来描述粘弹性流体。流场的控制方程通过耦合的连续和非连续伽辽金方法求解。XPP本构方程、水平集及其重初始化方程的求解采用隐式不连续伽辽金法。实验和仿真结果的良好一致性说明了这种组合计算算法的有效性。研究了注射速度和浇口尺寸对复杂嵌件不规则型腔中气体截留现象的影响。我们发现，在较高的注射速度和较小的浇口尺寸的情况下，很容易出现夹带气体。还显示了不同情况下的温度场分布。