Direct numerical simulations are extended to see the effects of time-periodic blowing frequency
from a spanwise slot on a turbulent boundary layer. The time-periodic blowing frequency is given in a
range 0≤f+≤0.08 at a fixed blowing amplitude of A+=0.5. The effects of the blowing frequency are
scrutinized by examining the phase- or time-averaged turbulent statistics. A most effective blowing
frequency is obtained at f+=0.03, where the maximum increases of Reynolds shear stress, streamwise
vorticity fluctuations and energy redistribution are made. The phase-averaged stretching and tilting
terms are studied for analyzing the increase of streamwise vorticity fluctuations which is closely
related to turbulent coherent structures.
Issue Date
2003-10-27
Language
ENG
Citation
The 5th Asian Computational Fluid Dynamics Conference, pp.0 - 0