scholarly journals Extended self-similarity in moment-generating-functions in wall-bounded turbulence at high Reynolds number

2016 ◽  
Vol 1 (4) ◽  
Author(s):  
X. I. A. Yang ◽  
C. Meneveau ◽  
I. Marusic ◽  
L. Biferale
Keyword(s):  
Reynolds Number ◽  
Generating Functions ◽  
High Reynolds Number ◽  
Self Similarity ◽  
Extended Self ◽  
Moment Generating Functions ◽  
High Reynolds ◽  
Wall Bounded Turbulence

scholarly journals Two-dimensional energy spectra in high-Reynolds-number turbulent boundary layers

2017 ◽  
Vol 826 ◽  
Author(s):  
Dileep Chandran ◽  
Rio Baidya ◽  
Jason P. Monty ◽  
Ivan Marusic
Keyword(s):  
Reynolds Number ◽  
High Reynolds Number ◽  
Reynolds Numbers ◽  
Streamwise Velocity ◽  
Spatial Spectrum ◽  
Two Dimensional ◽  
Hot Wire ◽  
Self Similarity ◽  
Low Reynolds Numbers ◽  
High Reynolds

Here, we report the measurements of two-dimensional (2-D) spectra of the streamwise velocity ($u$) in a high-Reynolds-number turbulent boundary layer. A novel experiment employing multiple hot-wire probes was carried out at friction Reynolds numbers ranging from 2400 to 26 000. Taylor’s frozen turbulence hypothesis is used to convert temporal-spanwise information into a 2-D spatial spectrum which shows the contribution of streamwise ($\unicode[STIX]{x1D706}_{x}$) and spanwise ($\unicode[STIX]{x1D706}_{y}$) length scales to the streamwise variance at a given wall height ($z$). At low Reynolds numbers, the shape of the 2-D spectra at a constant energy level shows$\unicode[STIX]{x1D706}_{y}/z\sim (\unicode[STIX]{x1D706}_{x}/z)^{1/2}$behaviour at larger scales, which is in agreement with the existing literature at a matched Reynolds number obtained from direct numerical simulations. However, at high Reynolds numbers, it is observed that the square-root relationship tends towards a linear relationship ($\unicode[STIX]{x1D706}_{y}\sim \unicode[STIX]{x1D706}_{x}$), as required for self-similarity and predicted by the attached eddy hypothesis.

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