Voids formed during liquid composite molding significantly degenerates mechanical performances of the final products, accurate prediction of the formation and size of void has significance for the parameter design of LCM. However, the 3D simulation method of void formation, in which the complex interconnecting of pores can be fully considered, has not been developed. In order to analyze the meso-scale-void formation process in full dimensionality, the mechanisms of dual-scale flow and void formation are analyzed firstly in this paper, then the mathematical models for the two-phase inter-tow and intra-tow flow are established based on the VOF theory. During numerical solving, the 3D geometry model is used and the momentum source of capillary force is updated in real-time to guarantee the simulation accuracy. The simulated formation process and size of meso-scale-void are compared with experimental results to verify the effectiveness and correctness of the developed method.

在液体复合材料成型过程中形成的空隙会严重降低最终产品的机械性能，准确预测空隙的形成和大小对于LCM的参数设计具有重要意义。然而，尚未开发出可以充分考虑孔的复杂互连的空隙形成的3D模拟方法。为了全面分析中尺度空隙的形成过程，本文首先分析了双尺度流和空隙形成的机理，然后建立了两相拖曳和拖曳内部流动的数学模型。是基于VOF理论建立的。在数值求解过程中，将使用3D几何模型并实时更新毛细作用力的动量源，以确保仿真精度。