Three-Dimensional Simulations of Non-Isothermal Flow for Gas Penetration in Complex Cavity during Gas Assisted Injection Moulding Process
Three-Dimensional Simulations of Non-Isothermal Flow for Gas Penetration in Complex Cavity during Gas Assisted Injection Moulding Process
复制标题
气体辅助注射成型复杂型腔气体渗透非等温流动三维模拟
DOI：
10.1002/cjce.23072
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Haifeng Niu
中科院分区：
文献类型：
--
作者：
Qiang Li;Haifeng Niu
利用R-函数构造形状水平集(LS)函数来表示气体辅助注射成型(GAIM)过程中的复杂模具型腔。利用形状最小二乘函数，将连续性方程、动量方程和能量方程推广到有限体积法和浸没边界法求解气液两相流动中。首先，提出了一种改进的简单耦合水平集-流体体积法(S-CLSVOF)来跟踪气液界面和聚合物熔体前沿的运动界面。然后通过二维和三维变形试验的基准问题来验证改进的S-CLSVOF.方法的能力。最后对两种不同复杂型腔内的气体穿透过程进行了数值模拟。数值结果表明，改进的S-CLSVOF方法比S-CLSVOF方法具有更高的精度，耦合的数值框架可以很好地描述气流的不对称现象、尾迹和喷泉现象，这对确定工艺条件和设计模具型腔具有重要意义。
In this paper an R-function is employed to construct the shape level set (LS) function for representing the complex mould cavity in a gas-assisted.injection moulding (GAIM) process. With the shape LS function, the continuity, momentum, and energy equations can be extended for solving.the gas-liquid two-phase flows using the finite volume and immersed boundary methods. Firstly, an improved simple coupled level set and.volume of fluid (S-CLSVOF) method is proposed to track the moving interfaces of gas-liquid interface and polymer melt front. Then the.benchmark problems of the two- and three-dimensional deformation tests are carried out to verify the ability of the improved S-CLSVOF.method. At last, the gas penetration processes are simulated in two different complex mould cavities. The numerical results show that the.improved S-CLSVOF method has higher accuracy than the S-CLSVOF method, and the coupled numerical framework can successfully depict the.asymmetry phenomenon of gas flow, racetracking, and fountain phenomena, which has great significance in determining processing.conditions and designing mould cavities.