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A Study on Representing Irregular Boundaries by the Lattice Boltzmann Method

机译：用格子Boltzmann方法表示不规则边界的研究。

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摘要

The traditional Lattice Boltzmann Method (LBM) is based on orthogonal, uniform lattice structure. Therefore, irregular boundaries representation deserves further attention. Besides the straightforward possibility of representing an irregular boundary by a staircase, there are more sophisticated approaches in the literature for an accurate modeling of an irregular boundary. In the present study, three of such methods are implemented and compared with each other and with straightforward staircase approximation. For comparing these methods, two laminar flow test cases are considered. Results obtained by a general-purpose CFD code are used as reference solution. In the CFD code, irregular boundaries are exactly represented, using a non-orthogonal finite volume discretization. It is observed thatthe so-called extrapolation method performs slightly inferior compared to the other results, if the mesh is not fine enough. However, all methods exhibit a comparable overall accuracy.
机译：传统的格子玻尔兹曼方法（LBM）基于正交均匀的晶格结构。因此，不规则的边界表示值得进一步关注。除了用楼梯代表不规则边界的直接可能性外，文献中还有更复杂的方法可以对不规则边界进行精确建模。在本研究中，实施了三种这样的方法，并以简单的阶梯近似法相互比较。为了比较这些方法，考虑了两个层流测试案例。通过通用CFD代码获得的结果用作参考解决方案。在CFD代码中，使用非正交有限体积离散化可以精确表示不规则边界。可以观察到，如果网格不够精细，则所谓的外推方法与其他结果相比效果稍差。但是，所有方法均显示出可比的总体精度。

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  • 来源
  • 会议地点 Milan(IT)
  • 作者

    E. ASLAN; A. NAHAVANDI; I. TAYMAZ; A.C. BENIM;

  • 作者单位

    Department of Mechanical Engineering Sakarya University Esentepe Campus, TR-54187 Sakarya TURKEY;

    Department of Mechanical and Process Engineering Duesseldorf University of Applied Sciences Josef-Gockeln-Str. 9, D-40474 Duesseldorf GERMANY;

    Department of Mechanical Engineering Sakarya University Esentepe Campus, TR-54187 Sakarya TURKEY;

    Department of Mechanical and Process Engineering Duesseldorf University of Applied Sciences Josef-Gockeln-Str. 9, D-40474 Duesseldorf GERMANY;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Irregular boundary treatment; Lattice Boltzmann Method (LBM);

    机译：不规则的边界处理；格子玻尔兹曼法（LBM）;

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