用格子玻尔兹曼方法模拟毛细渗透到填充结构中以优化陶瓷材料
Simulation of capillary infiltration into packing structures by the Lattice-Boltzmann method for the optimization of ceramic materials
摘要：
在这项工作中，我们要模拟与格子玻尔兹曼方法在2D的毛细渗透到多孔结构中获得的颗粒包装。本论文的主要工作是研究反应熔渗法制备碳纤维预成型体的致密化问题。其目的是确定高性能陶瓷制造的优化原则。对具有不同结构特性的填料进行了模拟。我们的分析表明，所观察到的缓慢渗透可以归因于界面动力学。钉扎是阻碍流体渗透的主要因素。详细分析了造成这种现象的机理。当允许表面生长时，发现钉扎现象变得更强。系统试图重现典型的实验条件进行了研究。事实证明，准确模拟的标准是具有挑战性的。提高精度的主要障碍，以克服似乎是过度发生的钉扎。
英文摘要：
In this work we want to simulate with the Lattice-Boltzmann method in 2D the capillary infiltration into porous structures obtained from the packing of particles. The experimental problem motivating our work is the densification of carbon preforms by reactive melt infiltration. The aim is to determine optimization principles for the manufacturing of high-performance ceramics. Simulations are performed for packings with varying structural properties. Our analysis suggests that the observed slow infiltrations can be ascribed to interface dynamics. Pinning represents the primary factor retarding fluid penetration. The mechanism responsible for this phenomenon is analyzed in detail. When surface growth is allowed, it is found that the phenomenon of pinning becomes stronger. Systems trying to reproduce typical experimental conditions are also investigated. It turns out that the standard for accurate simulations is challenging. The primary obstacle to overcome for enhanced accuracy seems to be the over-occurrence of pinning.
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