期刊
PHYSICS OF FLUIDS
卷 27, 期 6, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4923042
关键词
-
资金
- UK Turbulence Consortium (EPSRC) [EP/L000261/1]
- ERC
- PRACE
- Engineering and Physical Sciences Research Council [EP/L000261/1] Funding Source: researchfish
- EPSRC [EP/L000261/1] Funding Source: UKRI
A combined wind tunnel and computational study of grid-generated turbulence along the centreline shows that the close to -5/3 power law signature of energy spectra in the frequency domain originates relatively close to the grid not only where the velocity derivative statistics become quite suddenly isotropic but also where the turbulent fluctuating velocities are very intermittent and non-Gaussian. As the inlet flow velocity increases, these power laws are increasingly well defined and increasingly close to -5/3 over an increasing range of frequencies. However, this range continuously decreases with streamwise distance from the grid even though the local Reynolds number first increases and then decreases along the same streamwise extent. The intermittency at the point of origin of the close to -5/3 power spectra consists of alternations between intense vortex tube clusters with shallow broad-band spectra and quiescent regions where the velocity fluctuations are smooth with steep energy spectra. (c) 2015 AIP Publishing LLC.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据