Algebraic Closure of Scalar Dissipation Rate for Large Eddy Simulations of Turbulent Premixed Combustion
Algebraic Closure of Scalar Dissipation Rate for Large Eddy Simulations of Turbulent Premixed Combustion
复制标题
湍流预混燃烧大涡模拟的标量耗散率代数收敛
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
N. Swaminathan
中科院分区：
文献类型：
--
作者：
Y. Gao;N. Chakraborty;N. Swaminathan
使用自由传播统计平面火焰的直接数值模拟 (DNS) 数据库，对一系列不同的放热参数 τ、全局路易斯数 Le 和湍流雷诺数 Ret 值，对基于法夫尔过滤标量耗散率 (SDR) 的湍流预混燃烧大涡模拟 (LES) 的过滤反应速率收敛进行了先验分析。研究发现，当过滤器宽度大于火焰厚度时，现有的基于 SDR 的雷诺平均纳维-斯托克斯 (RANS) 模拟反应速率收敛对于 LES 也有效。这种基于 RANS 的反应速率收敛已在此处扩展到 LES，并且对于此处研究的滤波器宽度、τ、Le 和 Ret 的值，观察到该 LES 收敛具有令人满意的性能。基于被动标量混合模型和幂律对 SDR 闭包进行了先验 DNS 评估。此外，用于 RANS 模拟的现有 Favre 平均 SDR 代数模型已在此处扩展到 LES。代数闭包的性能已根据从 DNS 数据中提取的 Favre 过滤 SDR 进行了评估。我们发现，新提出的 模型（此处从现有的基于 RANS 的闭包扩展为 LES）可以令人满意地预测具有不同 τ、Le 和 Ret 值的一系列火焰的 SDR 局部和体积平均行为。还分析了亚网格湍流速度脉动建模对新开发的代数SDR闭包的敏感性，观察到该建模不会显着影响本研究提出的代数SDR模型的性能。
An a-priori analysis of the filtered reaction rate closure based on Favre-filtered scalar dissipation rate (SDR) for large eddy simulations (LES) of turbulent premixed combustion has been conducted using a direct numerical simulation (DNS) database of freely propagating statistically planar flames for a range of different values of heat release parameter τ, global Lewis number Le, and turbulent Reynolds number Ret. It has been found that an existing SDR based reaction rate closure for Reynolds averaged Navier–Stokes (RANS) simulations is also valid for LES, when the filter width is larger than the flame thickness. This RANS-based reaction rate closure has been extended here for LES, and a satisfactory performance of this LES closure is observed for the values of filter widths, τ, Le, and Ret investigated here. A-priori DNS assessment of the SDR closures based on passive scalar mixing model and a power-law has been conducted. Moreover, an existing algebraic model of Favre-averaged SDR for RANS simulations has been extended here for LES. The performances of the algebraic closures of have been assessed with respect to Favre-filtered SDR extracted from the DNS data. It has been found that the newly proposed model for , which was extended here for LES from an existing RANS-based closure, predicts both local and volume-averaged behaviors of SDR satisfactorily for a range of for flames with different values of τ, Le, and Ret. The sensitivity of sub-grid turbulent velocity fluctuation modeling on the newly developed algebraic SDR closure has also been analyzed and it has been observed that the modeling does not significantly affect the performance of the algebraic SDR model proposed in this study.
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影响因子：
4.4
作者：
Chakraborty, Nilanjan;Cant, R. S.
通讯作者：
Cant, R. S.
影响因子：
4.6
作者：
N. Chakraborty;N. Swaminathan
通讯作者：
N. Chakraborty;N. Swaminathan
DOI：
10.1007/s10494-010-9250-y
发表时间：
2010-02
期刊：
Flow, Turbulence and Combustion
影响因子：
--
作者：
N. Chakraborty;J. Rogerson;N. Swaminathan
通讯作者：
N. Chakraborty;J. Rogerson;N. Swaminathan
影响因子：
2.4
作者：
Chakraborty, Nilanjan;Katragadda, Mohit;Cant, R. Stewart
通讯作者：
Cant, R. Stewart
影响因子：
4.4
作者：
N. Chakraborty;G. Hartung;M. Katragadda;C. Kaminski
通讯作者：
N. Chakraborty;G. Hartung;M. Katragadda;C. Kaminski