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首页> 外文期刊>Journal of Computational Physics >The Local Front Reconstruction Method for direct simulation of two- and three-dimensional multiphase flows
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The Local Front Reconstruction Method for direct simulation of two- and three-dimensional multiphase flows

机译：直接模拟二维和三维多相流的局部前部重建方法

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摘要

We present a new interface reconstruction technique, the Local Front Reconstruction Method (LFRM), for incompressible multiphase flows. This new method falls in the category of Front Tracking methods but it shares automatic topology handling characteristics of the previously proposed Level Contour Reconstruction Method (LCRM). The LFRM tracks the phase interface explicitly as in Front Tracking but there is no logical connectivity between interface elements thus greatly easing the algorithmic complexity. Topological changes such as interfacial merging or pinch off are dealt with automatically and naturally as in the Level Contour Reconstruction Method. Here the method is described for both two- and three-dimensional flow geometries. The interfacial reconstruction technique in the LFRM differs from that in the LCRM formulation by foregoing using an Eulerian distance field function. Instead, the LFRM uses information from the original interface elements directly to generate the new interface in a mass conservative way thus showing significantly improved local mass conservation. Because the reconstruction procedure is independently carried out in each individual reconstruction cell after an initial localization process, an adaptive reconstruction procedure can be easily implemented to increase the accuracy while at the same time significantly decreasing the computational time required to perform the reconstruction. Several benchmarking tests are performed to validate the improved accuracy and computational efficiency as compared to the LCRM. The results demonstrate superior performance of the LFRM in maintaining detailed interfacial shapes and good local mass conservation especially when using low-resolution Eulerian grids.
机译：我们为不可压缩的多相流提出了一种新的界面重建技术，即局部前部重建方法（LFRM）。这种新方法属于“前沿跟踪”方法类别，但它具有以前提出的“水平轮廓重建方法”（LCRM）的自动拓扑处理特性。 LFRM和Front Tracking中一样，显式地跟踪阶段接口，但是接口元素之间没有逻辑连接，因此大大降低了算法的复杂性。像“界面合并”或“夹断”之类的拓扑更改可以像“水平轮廓重建方法”一样自动自然地处理。在此，针对二维和三维流动几何形状描述了该方法。通过使用欧拉距离场函数，LFRM中的界面重建技术与LCRM公式中的界面重建技术有所不同。取而代之的是，LFRM直接使用原始接口元素中的信息以保守的方式生成新的接口，从而显着改善了本地质量守恒。因为在初始定位过程之后，重建过程是在每个单独的重建单元中独立执行的，所以可以轻松地实施自适应重建过程以提高准确性，同时显着减少执行重建所需的计算时间。与LCRM相比，执行了一些基准测试以验证提高的准确性和计算效率。结果表明，LFRM在保持详细的界面形状和良好的局部质量守恒方面表现出色，特别是在使用低分辨率欧拉网格时。

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