Pressure power spectrum in high-Reynolds number wall-bounded flows
HHA Xu, A Towne, XIA Yang, I Marusic
International Journal of Heat and Fluid Flow | Elsevier | Published : 2020
We study the behaviors of pressure fluctuations in high Reynolds number wall-bounded flows. Pressure fluctuations are small-scale quantities compared to velocity fluctuations in a wall-bounded flow (Tsuji, Marusic, & Johansson, Int. J. Heat Fluid Flow, vol. 61, 2016, pp. 2–11.): at a given wall-normal distance y, the premultiplied velocity spectrum peaks at a streamwise wavelength on the order of the boundary layer thickness (λx=O(δ)), whereas the premultiplied pressure spectrum peaks at λx < O(y). The differing scales of pressure and velocity pose a challenge to modeling, and the scaling of the pressure spectrum in wall-bounded flows remains an unsolved issue from both a theoretical and mea..View full abstract
Awarded by Office of Naval Research
XY would like to thank A. Lozano-Duran and J. Jimenez for fruitful discussion. XY would also like to thank W. Wu and C. Meneveau for their help in accessing the channel flow data at the Johns Hopkins Turbulence Database. M.-K. Lee and A. Lozano-Duran are gratefully acknowledge for their generosity in sharing the DNS data. Financial support from Office of Naval Research (award number N00014-20-12315) is gratefully acknowledged.