Permeability prediction for flow normal to columnar solidification structures by large–scale simulations of phase–field and lattice Boltzmann methods
Permeability prediction for flow normal to columnar solidification structures by large–scale simulations of phase–field and lattice Boltzmann methods
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DOI：
10.1016/j.actamat.2018.10.039
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发表时间：
2019-02
期刊：
影响因子：
9.4
通讯作者：
T. Takaki;S. Sakane;M. Ohno;Y. Shibuta;T. Aoki
中科院分区：
文献类型：
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作者：
T. Takaki;S. Sakane;M. Ohno;Y. Shibuta;T. Aoki
计算机模拟是系统预测各种凝固条件下糊状区域液体流动渗透率的最有前途的方法。在本研究中，我们提出了一种利用相场和格子玻尔兹曼方法的大规模模拟的渗透率预测方法。使用所提出的方法，对垂直于具有多个枝晶/单元的柱状凝固结构的流动进行渗透率预测。此外，还对具有周期性排列的枝晶/细胞的柱状凝固结构进行了预测，以评估全凝固分数范围内的渗透率，并研究初级臂阵列对渗透率的影响。结果表明，使用柱状凝固结构特定界面面积的无量纲渗透率可以很好地近似为正六边形圆柱体阵列的无量纲渗透率。此外，已证实具有周期性正六边形阵列的柱状枝晶/单元结构为柱状凝固结构提供了现实的渗透率预测。
Computer simulation is the most promising approach for the systematical permeability prediction of liquid flow in the mushy zone for various solidification conditions. In this study, we propose a permeability prediction method by using large–scale simulation of phase–field and lattice Boltzmann methods. Using the proposed method, permeability predictions are performed for the flow normal to the columnar solidification structures with multiple dendrites/cells. In addition, the prediction is also performed for columnar solidification structures with periodically arranged dendrites/cells to evaluate the permeability in the full range of solidification fraction and investigate the effect of primary arm array on the permeability. As a result, it is concluded that the dimensionless permeability using a specific interface area of columnar solidification structures can be well approximated by that of a regular hexagonal array of cylinders. Moreover, it is confirmed that the columnar dendrite/cell structure with a periodic regular hexagonal array provides realistic permeability predictions for columnar solidification structures.