Peak position of dissipation spectrum in turbulent boundary layers.
The peak locations of energy dissipation spectrum (y(+)(kp)) are investigated experimentally in the low Reynolds number (R(theta)<5000) zero-pressure-gradient turbulent boundary layers. These peaks are scaled by the relation y(+)(kp)=2(u(*)delta/nu)(1/2)=2R(1/2)(*), where u(*) is friction velocity and delta is the boundary layer thickness. They are located close to the peak positions of the Reynolds shear stress (y(+)(p)), that is, y(+)(kp) approximately equal to y(+)(p). This result predicts that the small-scale structures residing in high-energy dissipation regions concentrate around y(+)(p).
Tsuji
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Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8603, Japan.