709 A Study on Management of Two-dimensional Turbulent Channel Flow by Introducing a Streamwise Vortex Pair

2005 ◽  
Vol 2005 (0) ◽  
pp. 95
Author(s):  
Shinsuke MOCHIZUKI ◽  
Hirotaka YONEDA ◽  
Hideo OSAKA
Keyword(s):  
Channel Flow ◽  
Vortex Pair ◽  
Streamwise Vortex ◽  
Turbulent Channel Flow ◽  
Two Dimensional

scholarly journals Streaky structure in a two-dimensional turbulent channel flow.

1985 ◽  
Vol 51 (470) ◽  
pp. 3092-3101 ◽  
Author(s):  
Yoichiro IRITANI ◽  
Nobuhide KASAGI ◽  
Masaru HIRATA
Keyword(s):  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Two Dimensional ◽  
Streaky Structure

Deformation and Relaxation Process of Two-Dimensional Channel Flow by Introducing a Pair of Streamwise Vortex

2003 ◽  
Vol 2003.41 (0) ◽  
pp. 129-130
Author(s):  
Shigehiro IWAHASHI ◽  
Takatsugu KAMEDA ◽  
Shinsuke MOCHIZUKI ◽  
Hideo OSAKA
Keyword(s):  
Relaxation Process ◽  
Channel Flow ◽  
Streamwise Vortex ◽  
Two Dimensional

An Analytical Study of the Standard k–ε Model

1990 ◽  
Vol 112 (2) ◽  
pp. 192-198 ◽  
Author(s):  
N. Takemitsu
Keyword(s):  
Experimental Data ◽  
Asymptotic Solution ◽  
Channel Flow ◽  
Analytical Study ◽  
Turbulent Channel Flow ◽  
Second Order ◽  
Two Dimensional ◽  
Ill Posed ◽  
Leading Term ◽  
Logarithmic Law

An asymptotic solution of the standard k–ε model for two-dimensional turbulent channel flow is found. Using this solution, five model constants in the model are all determined reasonably with the aid of experimental data. If an asymptotic solution with the logarithmic law as the leading term is sought for, the standard k–ε model is shown to be ill-posed since the second-order solution has divergent terms.

Wavelet analysis on the drag-reducing characteristics of turbulent channel flow with surfactant additive based on experimental data

2017 ◽  
Vol 95 (11) ◽  
pp. 1115-1121 ◽  
Author(s):  
Lu Wang ◽  
Zhi-Ying Zheng ◽  
Jia-Qi Bao ◽  
Tong-Zhou Wei ◽  
Wei-Hua Cai ◽  
...  
Keyword(s):  
Channel Flow ◽  
Coherent Structures ◽  
Turbulent Channel Flow ◽  
Discrete Wavelet ◽  
Two Dimensional ◽  
Solution Flow ◽  
Multi Scale ◽  
Turbulent Channel Flows ◽  
Scale Characteristics ◽  
Cetyltrimethyl Ammonium

Two-dimensional velocity fields for turbulent channel flows of water and 50 ppm CTAC/NaSal (cetyltrimethyl ammonium chloride/sodium salicylate) solution were experimentally obtained by particle image velocimetry. Multi-scale decompositions of the fluctuating velocity signals were performed by two-dimensional binary orthogonal discrete wavelet to analyze the influence of surfactant additives on the multi-scale characteristics of turbulent channel flow. From the results of wavelet multi-scale decompositions, it can be observed that the quantity of coherent structures near the wall in CTAC solution flow is decreased obviously. The results of the flatness factor show that the addition of drag-reducing additives inhibits the intermittency in turbulence. By analyzing the distribution of local intermittence measure and local Reynolds shear measure, it is found that the intermittency mainly concentrates near the wall, and the intermittent region distinctly reduces in CTAC solution flow compared with that in water flow. By combining the analysis of the motion of coherent structures in turbulent channel flow, it is shown that surfactant additives mainly and distinctly impact the coherent structures near the wall, especially in the viscous layer.

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