针对基于Darcy定律的树脂传递模塑(RTM)工艺的充模过程数值模拟的局限性,将纤维预制体内的充填流动作为两相流(树脂相和空气相)处理,在动量方程中考虑了惯性项和粘性项,采用有限体积方法(FVM)离散控制方程,并与VOF/PLIC界面追踪方法相结合,发展了求解树脂在纤维预制体内非稳态流动问题的数值模拟方法.在此基础上开发了RTM工艺的充模过程数值模拟程序,其算例的数值模拟结果与解析解或实验结果吻合良好,验证了此数值模拟方法的有效性和可靠性.
Aimed at the limitation of the numerical simulation of resin transfer molding processes based on the Darcy law, the resin flow in the fiber preform was modeled as a two-phase (resin and air)fluid flow in porous media. The momentum equations considering the inertia and viscous terms were discretized by the finite volume method (FVM). Combining the FVM with the volume of fluid/piecewise linear interface construction (VOF/PLIC) approach, a new numerical simulation algorithm was presented to solve the transient flow problem, and then a numerical simulation program of the mold filling process was developed. There is a good agreement between the numerical results and the analytical solutions as well as experimental results, so the reliability of the new numerical simulation algorithm is validated.
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