Turbulence in High-Frequency Periodic Fully-Developed Pipe Flow
The effects of high frequency organized unsteadiness on wall-bounded turbulence have been studied experimentally at higher frequencies than have been achieved in previous investigations. A detailed examination was made of the contention that non-linear resonant interactions might be found if oscillation were induced at a frequency characteristic of turbulence in the parent boundary layer. It was found that the response of turbulence to forced unsteadiness around and above the burst frequency constituted a monotonic approach to a “frozen state.” No resonant behavior was detected. However, when the period of forced oscillation reached a timescale characteristic of the lifetime of a low-speed streak in the sublayer, the streaks underwent some spatial organization with a commensurate reduction in their spanwise meandering motion. This effect is a minor one and does not appear to be a precursor to any resonant behavior.
KeywordsWall Shear Stress Streamwise Velocity Pipe Flow Forced Oscillation Parent Boundary Layer
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