Reactive large-eddy simulations (LES) of the stage of peak heat release rate of open atmosphere glove box fires are carried out. To the best of the authors’ knowledge, this is the first time that the LES of such a geometry is reported in the literature. A multi-fuel extension of the eddy-dissipation model (EDM) is used to simulate the combustion of the two distinct solid fuels, PMMA and Polycarbonate, relevant to this configuration. Three increasingly refined grids are considered. All of them lead to temperature values that are in good agreement with experimental data, and similar levels of heat release are obtained inside the glove box. From a more quantitative point of view, only the most refined grid leads to satisfactory values of LES quality criteria. The intermediate grid allows resolving a fraction of the inertial range dynamics, while the solution obtained on the coarsest grid exhibits very large turbulent structures with characteristic sizes of the order of the integral length scale. The analysis confirms that the choice of the grid cell size has a significant influence on the description of the local flow hydrodynamics, the location and thickness of the reactive zones.

中文翻译：

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全尺寸手套箱火灾的大涡模拟

对露天手套箱火灾的峰值热释放率阶段进行了反应大涡模拟（LES）。据作者所知，这是首次在文献中报道这种几何形状的 LES。涡耗散模型 (EDM) 的多燃料扩展用于模拟与此配置相关的两种不同固体燃料（PMMA 和聚碳酸酯）的燃烧。考虑三个日益细化的网格。所有这些都导致温度值与实验数据非常吻合，并且手套箱内获得了相似的放热水平。从更定量的角度来看，只有最精细的网格才能达到令人满意的 LES 质量标准值。中间网格允许解析惯性范围动力学的一小部分，而在最粗糙网格上获得的解表现出非常大的湍流结构，其特征尺寸为积分长度尺度的数量级。分析证实，网格单元尺寸的选择对局部流动流体动力学的描述、反应区的位置和厚度具有显着影响。