Space-time characteristics of the wall shear-stress fluctuations in an axial turbulent boundary layer with transverse curvature
- Authors
- Shin, D; Lee, S; Na, Y
- Issue Date
- Aug-2005
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Keywords
- turbulent boundary layer; transverse curvature; direct numerical simulation
- Citation
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.19, no.8, pp.1682 - 1691
- Journal Title
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
- Volume
- 19
- Number
- 8
- Start Page
- 1682
- End Page
- 1691
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/25166
- DOI
- 10.1007/BF03023944
- ISSN
- 1738-494X
- Abstract
- Direct numerical simulation database of an axial turbulent boundary layer is used to compute frequency and wave number spectra of the wall shear-stress fluctuations in a low-Reynolds number axial turbulent boundary layer. One-dimensional and two-dimensional power spectra of flow variables are calculated and compared. At low wave numbers and frequencies, the power of streamwise shear stress is larger than that of spanwise shear stress, while the powers of both stresses are almost the same at high wave numbers and frequencies. The frequency/streamwise wave number spectra of the wall flow variables show that large-scale fluctuations to the rms value is largest for the streamwise shear stress, while that of small-scale fluctuations to the rms value is largest for pressure. In the two-point auto-correlations, negative correlation occurs in streamwise separations for pressure, and in spanwise correlation for both shear stresses.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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