王文全; 张立翔; 郭亚昆; 闫妍

Translated title of the contribution: LES of turbulent flow in a vibrating curved-wall channel

Wenquan Wang, Lixiang Zhang, Yakun Guo, Yan Yan

Research output: Contribution to journalArticle

Abstract

To well understand the mechanism of energy dissipation in a turbine flow passage and explore the change of turbulence structures, a spatio-temporal sinusoidal oscillatory mode is numerically tested in a turbulent curved-channel flow using large eddy simulation (LES). Six computing cases incorporated with different vibrating parameters of the wall are dealt with, and the distributions of the pressure, vortices, and other turbulent statistical quantities in the near wall regions are studied. The results show that the turbulence intensities increase largely in near wall regions, suggesting that the viscous sublayer is thinner as a result of the velocity graduate's rise due to the spanwise wall oscillation. Furthermore, the energy dissipation is increasing. The present study also shows that the mechanism of energy dissipation by spanwise-wall oscillation is strongly related to the spanwise-vortex generated at the edge of the viscous sublayer by the periodic Couette flow layer.
Original languageChinese
Pages (from-to)618-623
Number of pages6
JournalAdvances in Water Science
Volume19
Issue number5
Publication statusPublished - Sep 2008

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large eddy simulation
turbulent flow
energy dissipation
vortex
turbulence
oscillation
Couette flow
channel flow
turbine

Cite this

Wang, W., Zhang, L., Guo, Y., & Yan, Y. (2008). 王文全; 张立翔; 郭亚昆; 闫妍. Advances in Water Science, 19(5), 618-623.

王文全; 张立翔; 郭亚昆; 闫妍. / Wang, Wenquan; Zhang, Lixiang; Guo, Yakun; Yan, Yan.

In: Advances in Water Science, Vol. 19, No. 5, 09.2008, p. 618-623.

Research output: Contribution to journalArticle

Wang, W, Zhang, L, Guo, Y & Yan, Y 2008, '王文全; 张立翔; 郭亚昆; 闫妍', Advances in Water Science, vol. 19, no. 5, pp. 618-623.
Wang W, Zhang L, Guo Y, Yan Y. 王文全; 张立翔; 郭亚昆; 闫妍. Advances in Water Science. 2008 Sep;19(5):618-623.
Wang, Wenquan ; Zhang, Lixiang ; Guo, Yakun ; Yan, Yan. / 王文全; 张立翔; 郭亚昆; 闫妍. In: Advances in Water Science. 2008 ; Vol. 19, No. 5. pp. 618-623.
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AB - To well understand the mechanism of energy dissipation in a turbine flow passage and explore the change of turbulence structures, a spatio-temporal sinusoidal oscillatory mode is numerically tested in a turbulent curved-channel flow using large eddy simulation (LES). Six computing cases incorporated with different vibrating parameters of the wall are dealt with, and the distributions of the pressure, vortices, and other turbulent statistical quantities in the near wall regions are studied. The results show that the turbulence intensities increase largely in near wall regions, suggesting that the viscous sublayer is thinner as a result of the velocity graduate's rise due to the spanwise wall oscillation. Furthermore, the energy dissipation is increasing. The present study also shows that the mechanism of energy dissipation by spanwise-wall oscillation is strongly related to the spanwise-vortex generated at the edge of the viscous sublayer by the periodic Couette flow layer.

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