一类复杂型腔内聚合物充模过程的数值模拟

Numerical Simulation of the Filling Process of Polymer in a Complex Cavity

基于一类厚度不均衡的三维复杂型腔,对聚合物注射成型的充模过程进行数值模拟.型腔不规则边界的处理采用区域扩充法,拟建立Navier-Stokes方程和Level Set方程耦合的两相流体模型,采用同位网格有限体积法及SIMPLE算法对模型分别进行离散和求解.基于上述模型和算法,对复杂型腔内熔体的流动和前沿界面的发展变化进行有效模拟,捕捉这类厚度不均衡型腔充模过程中的“跑道效应”与“喷泉效应”.数值结果表明区域扩充法与有限体积法结合是有效的,能够模拟相对复杂型腔内聚合物熔体的充模过程.

Numerical simulations of the filling process of injection molding for polymer are implemented on a 3D complex cavity with uneven thickness.The domain-extension method is used to deal with boundary of complex cavity,a two-phase flow model is proposed,in which the Navier-Stokes equation and Level Set equation are coupled.The equations are discretized by the finite volume method and solved by the SIMPLE algorithm on the collocated mesh.Based on the model and algorithm above mentioned,the evolution of front interface and flow of polymer melt in the complex cavity are predicted successfully,and the“speedway”phenomenon and“fountain flow”phenomenon in this cavity with uneven thickness are captured.Numerical results show that the domain-extension method combined with finite volume method is effective,and can be used to simulate the filling process of polymer melt in a relatively complex cavity.