Characteristics of space-time energy spectra in turbulent channel flows | |
Wu T(吴霆); Geng CH(耿晨晖); Yao YC; Xu CX; He GW(何国威)![]() | |
Source Publication | PHYSICAL REVIEW FLUIDS
![]() |
2017-08-31 | |
Volume | 2Issue:8Pages:084609 |
ISSN | 2469-990X |
Abstract | 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. |
DOI | 10.1103/PhysRevFluids.2.084609 |
URL | 查看原文 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000408708700003 |
WOS Keyword | SHEAR FLOWS ; SPATIOTEMPORAL SPECTRA ; WALL TURBULENCE ; REYNOLDS-NUMBER ; BOUNDARY-LAYER ; PRESSURE ; VELOCITY |
WOS Research Area | Physics |
WOS Subject | Physics, Fluids & Plasmas |
Funding Organization | 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) |
Department | LNM湍流 |
Classification | Q4 |
Ranking | 1 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/70049 |
Collection | 非线性力学国家重点实验室 |
Corresponding Author | He GW(何国威) |
Recommended Citation 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. |
Files in This Item: | Download All | |||||
File Name/Size | DocType | Version | Access | License | ||
JouArt-2017-147.pdf(975KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment