Scalar Dissipation Rate Transport and Its Modeling for Large Eddy Simulations of Turbulent Premixed Combustion
Scalar Dissipation Rate Transport and Its Modeling 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传输及其建模
DOI：
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发表时间：
2015
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
利用自由传播统计平面湍流预混火焰的直接数值模拟数据，分析了Favre滤波后标量耗散率(SDR)输运的统计行为。利用高斯滤波法对DNS数据进行了显式滤波，得到了Favre滤波后SDR输运方程的未封闭项，包括湍流输运()、热释放引起的密度变化()、标量和速度梯度排列引起的应变率贡献()、反应速率梯度与反应进度变量()之间的关联、SDR()的分子耗散以及扩散系数梯度。结果表明，和是SDR输运的主要阶数贡献者，其幅值仍然小于幅值，且与滤光片宽度无关。这些项的模型是在大涡模拟(LES)的背景下提出的，并且它们的性能已经相对于它们从显式过滤的DNS数据获得的相应值进行了评估。这些新提出的模型可以令人满意地预测不同过滤宽度、热释放参数和湍流雷诺数范围内这些非封闭项的定性和定量行为。
Statistical behavior of Favre-filtered scalar dissipation rate (SDR) transport has been analyzed using direct numerical simulations (DNS) data of freely propagating statistically planar turbulent premixed flames. The DNS data has been explicitly filtered using a Gaussian filter to obtain the unclosed terms of the Favre-filtered SDR transport equation, arising from turbulent transport (), density variation due to heat release (), strain rate contribution due to the alignment of scalar and velocity gradients (), correlation between the gradients of reaction rate and reaction progress variable (), molecular dissipation of SDR (), and diffusivity gradients . It has been found that , and are the leading order contributors to the SDR transport and the magnitude of remains smaller than the magnitudes of , and irrespective of the filter width. Models are proposed for these terms in the context of large eddy simulations (LES) and their performances have been assessed with respect to their corresponding values obtained from explicitly filtered DNS data. These newly proposed models are found to satisfactorily predict both the qualitative and quantitative behaviors of these unclosed terms for a range of different values of filter widths , heat release parameter , and turbulent Reynolds number .
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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