Multiscale Analysis of Anisotropy of Reynolds Stresses, Subgrid Stresses and Dissipation in Statistically Planar Turbulent Premixed Flames

被引:10
作者
Klein, Markus [1 ]
Trummler, Theresa [1 ]
Urban, Noah [1 ]
Chakraborty, Nilanjan [2 ]
机构
[1] Bundeswehr Univ Munich, Dept Aerosp Engn, D-85577 Neubiberg, Germany
[2] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
来源
APPLIED SCIENCES-BASEL | 2022年 / 12卷 / 05期
基金
英国工程与自然科学研究理事会;
关键词
anisotropies of Reynolds stress tensor; dissipation tensor and subgrid scale tensor; multiscale analysis; turbulent premixed flames; DIRECT NUMERICAL-SIMULATION; KINETIC-ENERGY; LARGE-SCALE; COMBUSTION; GRADIENT; VELOCITY; CLOSURE;
D O I
10.3390/app12052275
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The characterisation of small-scale turbulence has been an active area of research for decades and this includes, particularly, the analysis of small-scale isotropy, as postulated by Kolmogorov. In particular, the question if the dissipation tensor is isotropic or not, and how it is related to the anisotropy of the Reynolds stresses is of particular interest for modelling purposes. While this subject has been extensively studied in the context of isothermal flows, the situation is more complicated in turbulent reacting flows because of heat release. Furthermore, the landscape of Computational Fluid Dynamics is characterised by a multitude of methods ranging from Reynolds-averaged to Large Eddy Simulation techniques, and they address different ranges of scales of the turbulence kinetic energy spectrum. Therefore, a multiscale analysis of the anisotropies of Reynolds stress, dissipation and sub-grid scale tensor has been performed by using a DNS database of statistically planar turbulent premixed flames. Results show that the coupling between dissipation tensor and Reynolds stress tensor is weaker compared to isothermal turbulent boundary layer flows. In particular, for low and moderate turbulence intensities, heat release induces pronounced anisotropies which affect not only fluctuation strengths but also the characteristic size of structures associated with different velocity components.
引用
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页数:20
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