Characteristics of space-time energy spectra in turbulent channel flows
文献类型:期刊论文
作者 | Wu T(吴霆); Geng CH(耿晨晖); Yao YC; Xu CX; He GW(何国威) |
刊名 | PHYSICAL REVIEW FLUIDS |
出版日期 | 2017-08-31 |
卷号 | 2期号:8页码:084609 |
ISSN号 | 2469-990X |
DOI | 10.1103/PhysRevFluids.2.084609 |
文献子类 | Article |
英文摘要 | An energy spectrum is preliminarily characterized by its mean and standard deviation. In this study, we derive exact expressions for the means and bandwidths of space-time energy spectra at fixed frequencies. The mean wave numbers are used to determine the phase velocities that bridge from temporal spectra to space-time spectra. The bandwidths are used to measure the well-known spectral broadening. We show that phase velocities alone are insufficient to determine the bandwidths of energy spectra. As a result, the cross-spectral method predicts narrower bandwidths of energy spectra. Therefore, in addition to phase velocities, amplitudes are used to rescale the space-time energy spectra, leading to the correct bandwidths. Existing data from direct numerical simulations of turbulent channel flows validate the rescaling approach. |
分类号 | Q4 |
URL标识 | 查看原文 |
WOS关键词 | SHEAR FLOWS ; SPATIOTEMPORAL SPECTRA ; WALL TURBULENCE ; REYNOLDS-NUMBER ; BOUNDARY-LAYER ; PRESSURE ; VELOCITY |
WOS研究方向 | Physics |
语种 | 英语 |
WOS记录号 | WOS:000408708700003 |
资助机构 | National Natural Science Foundation of China(11302238 ; Strategic Priority Research Program(XDB22040104) ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(QYZDJ-SSW-SYS002) ; National Basic Research Program of China (973 Program)(2013CB834100) ; 11232011 ; 11572331 ; 11490551) |
源URL | [http://dspace.imech.ac.cn/handle/311007/70049] |
专题 | 力学研究所_非线性力学国家重点实验室 |
通讯作者 | He GW(何国威) |
推荐引用方式 GB/T 7714 | Wu T,Geng CH,Yao YC,et al. Characteristics of space-time energy spectra in turbulent channel flows[J]. PHYSICAL REVIEW FLUIDS,2017,2(8):084609. |
APA | Wu T,Geng CH,Yao YC,Xu CX,&He GW.(2017).Characteristics of space-time energy spectra in turbulent channel flows.PHYSICAL REVIEW FLUIDS,2(8),084609. |
MLA | Wu T,et al."Characteristics of space-time energy spectra in turbulent channel flows".PHYSICAL REVIEW FLUIDS 2.8(2017):084609. |
入库方式: OAI收割
来源:力学研究所
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