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首页> 外文期刊>International Journal of Heat and Mass Transfer >Front tracking method in modeling transport phenomena accompanying liquid-solid phase transition in binary alloys and semitransparent media
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Front tracking method in modeling transport phenomena accompanying liquid-solid phase transition in binary alloys and semitransparent media

机译：在二元合金和半透明介质中伴随液相-固相​​转变的迁移现象建模的前跟踪方法

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The paper presents the potential of an efficient front tracking method on a fixed control-volume grid in micro-macroscopic numerical modeling of both binary alloy solidification and a solid-liquid phase transition of single-component or doped optically functioning materials. In the former case, the method, basing on the assumption that an envelope of columnar dendrite tips moves locally according to a single crystal growth law, allows more precise identification of zones of different dendritic structures developing within the two-phase region, and thus more detailed analysis of some closing models. It is shown, by exploiting the commonly used benchmark problem that a porous medium model of the columnar mush must be carefully chosen since it strongly affects the predicted macro-segregation pattern. In the case of solidification of a single-component or doped semi-transparent material the combination of the front tracking method with the immersed boundary technique provides a new simulation method, which can handle different thermo-physical and optical properties of liquid and solid phases, processes of emission, absorption, reflection and refraction or transmission of thermal radiation at a diffusive or specular distinct solid-liquid interface detected by the front tracking technique. The method has been used in a detailed parametric analysis where the impact of different optical configurations of both phases and their various optical properties as well as variable transmissivity of solid-liquid interface on the phase change process development has been addressed.
机译：本文提出了一种在固定控制体积网格上有效的前沿跟踪方法在二元合金凝固和单组分或掺杂的光学功能材料的固-液相转变的微观微观数值模拟中的潜力。在前一种情况下，该方法基于柱状枝晶尖端的包络根据单晶生长定律局部移动的假设，从而可以更精确地识别在两相区域内形成的不同枝晶结构的区域，从而获得更多一些封闭模型的详细分析。通过利用常用的基准问题表明，必须谨慎选择柱状糊状物的多孔介质模型，因为它会严重影响预测的宏观偏析模式。在固化单组分或掺杂的半透明材料的情况下，前跟踪方法与浸入边界技术的结合提供了一种新的模拟方法，该方法可以处理液相和固相的不同热物理和光学性质，前跟踪技术检测到的在扩散或镜面截然不同的固液界面处的热辐射的发射，吸收，反射和折射或传输过程。该方法已用于详细的参数分析中，其中已解决了两个相的不同光学配置及其各种光学特性以及固液界面可变透射率对相变过程发展的影响。

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