Data-driven decomposition of the streamwise turbulence kinetic energy in boundary layers. Part 2. Integrated energy and A(1)
Woutijn J Baars, Ivan Marusic
Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2020
Scalings of the streamwise velocity energy spectra in turbulent boundary layers were considered in Part 1 (Baars & Marusic, J. Fluid Mech., vol. 882, 2020, A25). A spectral decomposition analysis provided a means to separate out attached and non-attached eddy contributions and was used to generate three spectral sub-components, one of which is a close representation of the spectral signature induced by self-similar, wall-attached turbulence. Since sub-components of the streamwise turbulence intensity u2 follow from an integration of the velocity energy spectra, we here focus on the scaling of the former. Wall-normal profiles and Reynolds-number trends of the three individual, additive sub-co..View full abstract
We gratefully acknowledge the Australian Research Council for financial support and are appreciative of the publicly available DNS data of Sillero et al. (2013). We would also like to give special thanks to J. Monty, D. Krug, D. Chandran and H. Nagib for helpful discussions on the content of the manuscript.