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Large Eddy Simulations of the Ceiling Jet Induced by the Impingement of a Turbulent Air Plume

机译：湍流气柱撞击引起的天花板射流的大涡模拟

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摘要

In this paper, a sensitivity study is performed with FireFOAM 2.2.x for a hot air jet plume impinging onto a flat horizontal ceiling. The plume evolution and the induced ceiling flow are considered. The influence of the level of turbulence imposed at the inlet, in terms of intensity and eddy length scale, is discussed. Also, the effect of the turbulence model constant is examined. For the case considered, the best results are obtained when no sub-grid scale (SGS) model is used. If a SGS model is used, the level of turbulence at the inlet and the choice of the turbulence model constant are shown to have a significant effect on the prediction of plume's spreading and the ceiling flow velocity. The eddy length scale at the inflow does not have significant impact on the results. Comparisons with the available experimental data indicate that FireFOAM is capable of predicting the mean velocity-field well. In the near field region, an under-estimation of the turbulent velocity fluctuations is observed, whereas reasonably good agreement is obtained in the far field.
机译：在本文中，使用FireFOAM 2.2.x对撞击到平坦水平天花板的热空气喷射羽进行了敏感性研究。考虑羽流演化和诱导的天花板流动。讨论了在强度和涡流长度尺度上施加在入口处的湍流水平的影响。另外，检查了湍流模型常数的影响。对于所考虑的情况，如果不使用子网格规模（SGS）模型，则可获得最佳结果。如果使用SGS模型，则表明入口处的湍流水平和湍流模型常数的选择对羽流扩散和顶板流速的预测具有重要影响。流入处的涡流长度尺度对结果没有显着影响。与可用实验数据的比较表明，FireFOAM能够很好地预测平均速度场。在近场区域中，观察到湍流速度波动的估计不足，而在远场中获得了相当好的一致性。

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  • 来源
    《Fire Technology》 |2016年第6期|2093-2115|共23页
  • 作者

    Zadeh Setareh Ebrahim; Maragkos Georgios; Beji Tarek; Merci Bart;

  • 作者单位

    Univ Ghent, Dept Flow Heat & Combust Mech, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium;

    Univ Ghent, Dept Flow Heat & Combust Mech, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium;

    Univ Ghent, Dept Flow Heat & Combust Mech, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium;

    Univ Ghent, Dept Flow Heat & Combust Mech, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium;

  • 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

    FireFOAM; Hot air jet plume; Ceiling flow; LES;

    机译：FireFOAM;热空气喷流;天花板流量;LES;

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