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基于粘性流体力学基本方程，针对气体辅助注射成型的特点，提出合理的假设并进行必要的简化，建立描述气体辅助注射成型充模流动过程的数学模型，进而采用有限元／有限差分混合算法进行数值求解。在对移动边界的处理采用控制体积法对充模过程中的两类移动边界：熔体前沿、熔体—气体边界进行跟踪，从而实现气体辅助注射成型充模过程的数值模拟。
Based on the basic equations of viscous fluid dynamics, aiming at the characteristics of gas-assisted injection molding, reasonable assumptions and necessary simplifications are put forward. The mathematical model describing the filling flow of gas-assisted injection molding is established, and then the finite element / finite difference hybrid algorithm Solve. In the process of moving the boundary, the control volume method is used to simulate the two types of moving boundary in the filling process: the melt front and the melt-gas boundary, so as to realize the numerical simulation of gas-assisted injection molding.