Large eddy simulation of a nonpremixed reacting jet: Application and assessment of subgrid-scale combustion models
Large eddy simulation of a nonpremixed reacting jet: Application and assessment of subgrid-scale combustion models
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DOI：
10.1063/1.869749
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发表时间：
1998-10
期刊：
影响因子：
--
通讯作者：
P. DesJardin;S. Frankel
中科院分区：
文献类型：
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作者：
P. DesJardin;S. Frankel
为了评估几种亚网格尺度（SGS）燃烧模型，本文给出了二维、空间发展的、可压缩平面自由射流在F+rOx→（1+r）P型理想化放热化学反应中的大涡模拟（LES）和直接数值模拟（DNS）结果。进行了先验和后验评估。所用的SGS湍流模型是动态Smagorinsky模型（DSM）。在这项研究中采用了两类SGS燃烧模型。这些方法包括守恒标量方法和直接闭包方法。具体而言，SGS燃烧模型涉及几种形式的直接过滤反应速率封闭，包括一个规模相似过滤反应速率模型（SSFRRM），和一个混合控制的应变层流小火焰模型（SLFM）的形式的热化学状态关系，从DNS，和两个假设的形式为亚网格混合分数过滤密度函数（FDF）。大涡模拟的结果是合理的。
Results from large eddy simulations (LES) and direct numerical simulations (DNS) of a two-dimensional, spatially developing, compressible planar free jet undergoing an idealized, exothermic, chemical reaction of the type F+rOx→(1+r)P are presented in order to assess several subgrid-scale (SGS) combustion models. Both a priori and a posteriori assessments are conducted. The SGS turbulence model used is the dynamic Smagorinsky model (DSM). Two classes of SGS combustion models are employed in this study. These include the conserved scalar approach and the direct closure approach. Specifically, the SGS combustion models involve several forms of direct filtered reaction rate closures, including a scale similarity filtered reaction rate model (SSFRRM), and a mixing controlled strained laminar flamelet model (SLFM) in the form of thermochemical state relationships, obtained from the DNS, and two assumed forms for the subgrid mixture fraction filtered density function (FDF). In general, LES results are in reasona...