"Transport in bypass transition: mapping active time scales using wavelet techniques"

by
Lewalle, J. and Ashpis, D.E.

ABSTRACT

We use wavelet methods to map the evolution of turbulent scales in a boundary layer undergoing bypass transition. For these intermittent flows characterized by the interplay of freestream turbulence and rapidly evolving turbulent spots, wavelets are preferable to Fourier techniques. We calculate ensemble- and spot-conditioned time scales based on two different criteria: maximum of spectral energy content, and maximum of spectral Reynolds stress content. Differences between the two methods are highlighted.