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首页> 外文期刊>Fuel >Assessment of the impact of subgrid-scale stress models and mesh resolution on the LES of a partially-premixed swirling flame
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Assessment of the impact of subgrid-scale stress models and mesh resolution on the LES of a partially-premixed swirling flame

机译：评估子级压力模型的影响和网格分辨率对部分预混旋转火焰的纱线

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摘要

Large Eddy Simulation (LES) has become an attractive option for the modelling of turbulent combustion, and a significant effort has been put into the development of suitable models for combustion at the subgrid-scale (SGS). Comparatively, little attention has been paid to the impact of SGS stress models in the simulation of complex reactive flows. In the present work, a partially-premixed case from the Sydney swirl-stabilised flames series has been investigated using LES and the Flamelet Generated Manifold (FGM) approach, employing four different SGS stress models on three numerical grids with different levels of refinement, quantified with an a priori mesh quality criterion. It was found that the use of advanced SGS models can improve the accuracy of the results significantly in both the highly turbulent region close to the burner and in the low-turbulence region further downstream. Also, a physically sound formulation for SGS stresses was found to reduce the sensitivity of the results to mesh refinement, giving acceptable results on relatively coarse grids. This can be a significant advantage in the modelling of complex geometries where there is a need to find a compromise between mesh refinement and computational costs.
机译：大型涡流仿真（LES）已成为湍流燃烧建模的有吸引力的选择，并且在底片级（SGS）上的燃烧模型的开发中已经进行了重大努力。相对轻地，已经注意到SGS应力模型在复杂反应流动模拟中的影响。在本作本作中，使用LES和FLAMETED歧管（FGM）方法研究了来自悉尼旋流稳定的火焰系列的部分预混合案例，在三种数值网格上采用四种不同的SGS应力模型，具有不同水平的细化，量化具有先验网格质量标准。结果发现，使用先进的SGS模型可以在靠近燃烧器的高度湍流区域和进一步下游的低湍流区域中显着提高结果的准确性。此外，发现对SGS应力的物理性配方降低了结果对网格细化的敏感性，在相对粗略的网格上给出了可接受的结果。这可以是在复杂几何形状的建模中是一种重要的优势，在那里存在需要在网格细化和计算成本之间找到折衷方的折衷。

著录项

  • 来源
    《Fuel》 |2020年第1期|118620.1-118620.20|共20页
  • 作者

    De Santis Andrea; Clements Alastair G.; Pranzitelli Alessandro; Ingham Derek B.; Pourkashanian Mohamed;

  • 作者单位

    Univ Sheffield Dept Mech Engn Energy Engn Grp Arts Tower Western Bank Sheffield S10 2TN S Yorkshire England;

    Univ Sheffield Dept Mech Engn Energy Engn Grp Arts Tower Western Bank Sheffield S10 2TN S Yorkshire England;

    ALTEN Grp Ltd 41 Moorgate London EC2R 6PP England;

    Univ Sheffield Dept Mech Engn Energy Engn Grp Arts Tower Western Bank Sheffield S10 2TN S Yorkshire England;

    Univ Sheffield Dept Mech Engn Energy Engn Grp Arts Tower Western Bank Sheffield S10 2TN S Yorkshire England;

  • 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

    LES; Flamelet generated manifold; Partially premixed combustion; Swirling flows;

    机译：LES;爆炸产生歧管;部分预混合的燃烧;旋流;

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