Flame resolved simulation of a turbulent premixed bluff-body burner experiment. Part II: A-priori and a-posteriori investigation of sub-grid scale wrinkling closures in the context of artificially thickened flame modeling
Flame resolved simulation of a turbulent premixed bluff-body burner experiment. Part II: A-priori and a-posteriori investigation of sub-grid scale wrinkling closures in the context of artificially thickened flame modeling
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湍流预混钝体燃烧器实验的火焰解析模拟。
DOI：
10.1016/j.combustflame.2017.02.012
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发表时间：
2017
影响因子：
4.4
通讯作者：
A. Kempf
中科院分区：
文献类型：
--
作者：
F. Proch;P. Domingo;L. Vervisch;A. Kempf
对大涡模拟(LES)中人工增稠火焰(ATF)燃烧模型的动态子过滤器闭合进行了一致性优先和后验分析。这些分析是基于Hochgreb和Barlow对钝体燃烧器实验进行的火焰分辨模拟(准DNS)和大涡模拟(PFGM)进行的。火焰分辨模拟和大涡模拟都是在单个真实火焰实验条件下进行的，使用相同的区域尺寸、过滤器尺寸、边界条件和数值，所有这些都通过与实验数据的比较进行了额外的验证。对于子过滤器起皱因子的评估，Charlette等人建立了完善的模型。(2002)，在Wang等人的修改版本中。(2011)在静态模型参数和动态模型参数的基础上，进一步讨论了一种新的动态幂函数模型。在TEA优先级分析中，比较了亚网格尺度(SGS)起皱因子的概率密度函数(PDF)与基于火焰分辨模拟数据的建模的概率密度函数(PDF)。然后，将事先建模的皱纹因子PDF与LES结果中的后续结果进行比较，在LES结果中，所有模型的形状都相似。静态模型往往会过高地预测起皱系数，对于中、小过滤宽度的动态模型有较好的一致性，新的公式改进了后者的结果。对于最大的过滤器宽度，动态模型低估了起皱系数。然而，这种预测不足被进程变量场更大的梯度所补偿，使得以进程变量为条件的平均火焰表面密度比起皱系数PDF更符合火焰分辨模拟。最后，对大涡模拟、火焰分辨模拟和实验得到的时间平均温度的径向分布进行了比较。采用动态SGS起皱模型，大涡模拟结果与火焰分辨模拟结果相比，通过网格加密收敛。
Dynamic sub-filter closures for artificially thickened flame (ATF) combustion models for large eddy simulation (LES) are investigated with consistenta-priorianda-posteriorianalyses. The analyses are based on a flame resolved simulation (quasi DNS) and large eddy simulations of the bluff body burner experiment by Hochgreb and Barlow with premixed flamelet generated manifolds (PFGM). Both flame resolved simulation and LES are performed under the conditions of a single real flame experiment, using the same domain size, filter sizes, boundary conditions and numerics, all with an additional validation by comparison to experimental data. For the evaluation of the sub-filter wrinkling factor, the well-established model by Charlette et al. (2002) in the modified version by Wang et al. (2011) is used with a static and with a dynamic model parameter, a new dynamic power-law model is discussed additionally. In thea-priorianalysis, the probability density functions (PDFs) of the sub-grid scale (SGS) wrinkling factor are compared against the modeled ones based on the flame resolved simulation data. Thesea-priorimodeled wrinkling factor PDFs are then compared against thea-posterioriones from the LES results, where a similar shape is observed for all models. The static model tends to over-predict the wrinkling factor, a better agreement is found for the dynamic models for the medium and small filter width, where the new formulation improves the results for the latter. For the largest filter width, the wrinkling factor is under-predicted by the dynamic models. This under-prediction is, however, compensated by larger gradients of the progress variable field so that the mean flame surface density conditioned on the progress variable is in closer agreement with the flame resolved simulation than the wrinkling factor PDFs are. Finally, radial profiles of the time-averaged temperature from the LES, flame resolved simulation and experiment are compared against each other. With the dynamic SGS wrinkling models, the LES results converge with grid refinement against the flame resolved simulation results.
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影响因子：
4.4
作者：
G. Kuenne;F. Seffrin;Frederik Fuest;Thabo Stahler;A. Ketelheun;D. Geyer;J. Janicka;A. Dreizler
通讯作者：
G. Kuenne;F. Seffrin;Frederik Fuest;Thabo Stahler;A. Ketelheun;D. Geyer;J. Janicka;A. Dreizler
影响因子：
4.4
作者：
G. Kuenne;A. Ketelheun;J. Janicka
通讯作者：
G. Kuenne;A. Ketelheun;J. Janicka
DOI：
10.1007/s10494-013-9492-6
发表时间：
2013-07
期刊：
Flow, Turbulence and Combustion
影响因子：
--
作者：
A. Ketelheun;G. Kuenne;J. Janicka
通讯作者：
A. Ketelheun;G. Kuenne;J. Janicka
影响因子：
2.4
作者：
Brauner, T.;Jones, W. P.;Marquis, A. J.
通讯作者：
Marquis, A. J.
影响因子：
4.6
作者：
Chakraborty, N.;Swaminathan, N.
通讯作者：
Swaminathan, N.