| 题名 | Cascades of temperature and entropy fluctuations in compressible turbulence |
| 作者 | |
| 通讯作者 | Wang, Jianchun; Wan, Minping |
| 发表日期 | 2019-05-25
|
| DOI | |
| 发表期刊 | |
| ISSN | 0022-1120
|
| EISSN | 1469-7645
|
| 卷号 | 867页码:195-215 |
| 摘要 | Cascades of temperature and entropy fluctuations are studied by numerical simulations of stationary three-dimensional compressible turbulence with a heat source. The fluctuation spectra of velocity, compressible velocity component, density and pressure exhibit the $-5/3$ scaling in an inertial range. The strong acoustic equilibrium relation between spectra of the compressible velocity component and pressure is observed. The $-5/3$ scaling behaviour is also identified for the fluctuation spectra of temperature and entropy, with the Obukhov-Corrsin constants close to that of a passive scalar spectrum. It is shown by Kovasznay decomposition that the dynamics of the temperature field is dominated by the entropic mode. The average subgrid-scale (SGS) fluxes of temperature and entropy normalized by the total dissipation rates are close to 1 in the inertial range. The cascade of temperature is dominated by the compressible mode of the velocity field, indicating that the theory of a passive scalar in incompressible turbulence is not suitable to describe the inter-scale transfer of temperature in compressible turbulence. In contrast, the cascade of entropy is dominated by the solenoidal mode of the velocity field. The different behaviours of cascades of temperature and entropy are partly explained by the geometrical properties of SGS fluxes. Moreover, the different effects of local compressibility on the SGS fluxes of temperature and entropy are investigated by conditional averaging with respect to the filtered dilatation, demonstrating that the effect of compressibility on the cascade of temperature is much stronger than on the cascade of entropy. |
| 关键词 | |
| 相关链接 | [来源记录] |
| 收录类别 | |
| 语种 | 英语
|
| 学校署名 | 第一
; 通讯
|
| 资助项目 | Young Elite Scientist Sponsorship Program by CAST[2016QNRC001]
|
| WOS研究方向 | Mechanics
; Physics
|
| WOS类目 | Mechanics
; Physics, Fluids & Plasmas
|
| WOS记录号 | WOS:000461796300001
|
| 出版者 | |
| EI入藏号 | 20191306676143
|
| EI主题词 | Compressibility
; Entropy
; Turbulence
; Velocity
|
| EI分类号 | Thermodynamics:641.1
; Materials Science:951
|
| ESI学科分类 | ENGINEERING
|
| 来源库 | Web of Science
|
| 引用统计 |
被引频次[WOS]：29
|
| 成果类型 | 期刊论文 |
| 条目标识符 | http://kc.sustech.edu.cn/handle/2SGJ60CL/25863 |
| 专题 | 工学院_力学与航空航天工程系 |
| 作者单位 | 1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China 2.Univ Delaware, Dept Mech Engn, Newark, DE 19716 USA 3.Peking Univ, State Key Lab Turbulence & Complex Syst, Ctr Appl Phys & Technol, Coll Engn, Beijing 100871, Peoples R China |
| 第一作者单位 | 力学与航空航天工程系 |
| 通讯作者单位 | 力学与航空航天工程系 |
| 第一作者的第一单位 | 力学与航空航天工程系 |
| 推荐引用方式 GB/T 7714 |
Wang, Jianchun,Wan, Minping,Chen, Song,et al. Cascades of temperature and entropy fluctuations in compressible turbulence[J]. JOURNAL OF FLUID MECHANICS,2019,867:195-215.
|
| APA |
Wang, Jianchun,Wan, Minping,Chen, Song,Xie, Chenyue,Wang, Lian-Ping,&Chen, Shiyi.(2019).Cascades of temperature and entropy fluctuations in compressible turbulence.JOURNAL OF FLUID MECHANICS,867,195-215.
|
| MLA |
Wang, Jianchun,et al."Cascades of temperature and entropy fluctuations in compressible turbulence".JOURNAL OF FLUID MECHANICS 867(2019):195-215.
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| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | 操作 | |
| Wang_JC_etal_JFM_201（624KB） | -- | -- | 限制开放 | -- | ||
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