Numerical simulation of melt filling process in complex mold cavity with insets using IB-CLSVOF method
Numerical simulation of melt filling process in complex mold cavity with insets using IB-CLSVOF method
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DOI：
10.1016/j.compfluid.2016.04.005
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发表时间：
2016-06
影响因子：
2.8
通讯作者：
Qiang Li
中科院分区：
文献类型：
--
作者：
Qiang Li
提出了一种用于不可压两相流界面追踪的耦合水平集和流体体积（CLSVOF）方法，该方法只进行VOF平流，并利用零水平集（LS）公式和LS重新初始化方程重建界面附近的有符号距离场，易于编程实现。同时，采用基于界面曲率的质量修正方案，保证了液体质量的正确守恒。首先，CLSVOF方法的性能进行了评估，通过二维和三维变形场试验。然后采用CLSVOF方法对气泡上升和液滴下落问题进行了数值模拟。最后，采用形状LS函数描述和处理模具型腔的不规则表面（浸入边界）。借助形状函数，将浸没边界与CLSVOF耦合方法应用于含嵌件复杂型腔的熔体充型过程。数值结果表明，所提出的IB-CLSVOF方法具有科普复杂界面变化的能力，准确。数值结果表明，IB-CLSVOF方法能够很好地描述滚道、夹气和熔接痕的发展过程，为工艺条件的确定和模具型腔的设计提供了依据。
A coupled level-set and volume-of-fluid (CLSVOF) method is proposed for tracking interface of incompressible two-phase flows, where the VOF advection is carried out only, and a zero level-set (LS) formula and LS reinitialization equation are employed to reestablish the signed distanced field near the interface, which can program easily. Meanwhile, a mass-correction scheme based on the interface curvature is used to conserve the liquid mass correctly. Firstly, the performance of the CLSVOF method is evaluated through two- and three-dimensional deformation field tests. Then, the CLSVOF method is adopted to simulate the rising bubble and droplet falling problems. Finally, a shape LS function is used to describe and treat the irregular surface (immersed boundary) of mold cavity. With the aid of the shape function, the coupled immersed boundary (IB) and CLSVOF (IB-CLSVOF) method is applied to the melt filling process in the complex mold cavity with insets. The numerical results show that the proposed IB-CLSVOF method has the capability to cope with complex interface variations accurately. And also, the numerical results demonstrate that IB-CLSVOF method is able to successfully depict the phenomena of race-tracking, air entrapment and weldline development, which are very helpful for determining processing conditions and designing mold cavities.