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首页> 外文期刊>Engineering analysis with boundary elements >3D Lattice Boltzmann flow simulations through dendritic mushy zones
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3D Lattice Boltzmann flow simulations through dendritic mushy zones

机译：通过树枝状糊状区的3D格子Boltzmann流动模拟

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摘要

Literature data on permeability of dendritic microstructures show a wide scatter. For a given solid fraction the permeability may vary easily by two orders of magnitude. This might be caused by some unavoidable technical problems in doing the corresponding experiments. However, even numerical results may vary greatly depending on the source of the input microstructure and/or the dimension of flow simulation (2D vs. 3D) and/or the applied boundary conditions. In the present work we have used the Lattice Boltzmann technique to perform flow simulations through 2D and 3D dendritic micro-structures coming from (ⅰ) simplified geometrical approximations, (ⅱ) phase field simulations of binary alloys and (ⅲ) computer tomographs on AlCu alloys. The discussion of the results shows that for low solid fraction, simple geometries can be used as substitute for dendritic structures. However, once the secondary arms are more prominent, large deviations and scattering occur. These deviations are caused by the strong variation of the dendrites geometry along the growth direction, making simplified structures insufficient to derive a reasonable value for the permeability.
机译：关于树状微结构的渗透性的文献数据显示出广泛的分散性。对于给定的固体分数，渗透率可以容易地变化两个数量级。这可能是由进行相应实验中不可避免的技术问题引起的。但是，根据输入微结构的来源和/或流动模拟的尺寸（2D与3D）和/或所应用的边界条件，甚至数值结果也可能有很大差异。在目前的工作中，我们已经使用了Lattice Boltzmann技术通过2D和3D树枝状微观结构进行流动模拟，这些微观结构来自（ⅰ）简化的几何近似，（ⅱ）二元合金的相场模拟和（ⅲ）AlCu合金的计算机断层扫描仪。对结果的讨论表明，对于低固含量，可以使用简单的几何形状替代树枝状结构。但是，一旦次级臂更加突出，就会出现较大的偏差和散射。这些偏差是由树枝状晶体沿生长方向的强烈变化引起的，从而使简化的结构不足以得出合理的渗透率值。

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  • 作者

    A. Ludwig; A. Kharicha; C. Hoelzl; J. Domitner; M. Wu; T. Pusztai;

  • 作者单位

    Department of Metallurgy, Chair of Simulation and Modeling of Metallurgical Processes, University of Leoben, 8700 Leoben, Austria,Christian Doppler Laboratory for Multiphase Simulation of Metallurgical Processes, 8700 Leoben, Austria,University of Leoben, Department of Metallurgy, Chair of Simulation and Modeling of Metallurgical-Metallurgical Processes, 8700 Leoben, Austria;

    Department of Metallurgy, Chair of Simulation and Modeling of Metallurgical Processes, University of Leoben, 8700 Leoben, Austria,Christian Doppler Laboratory for Multiphase Simulation of Metallurgical Processes, 8700 Leoben, Austria;

    Material Center Leoben, 8700 Leoben, Austria;

    Christian Doppler Laboratory for Multiphase Simulation of Metallurgical Processes, 8700 Leoben, Austria;

    Department of Metallurgy, Chair of Simulation and Modeling of Metallurgical Processes, University of Leoben, 8700 Leoben, Austria;

    Reasearch Institute for Solid State Physics and Optics, 1121 Budapest, Hungary;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lattice-Boltzmann method; Alloy solidification; Mush permeability; Dendritic microstructure;

    机译：Lattice-Boltzmann方法;合金凝固;糊状渗透性树状组织;

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