An exploratory investigation of the effect of a moving boundary on gas phase turbulence

Turbulent flow over a moving boundary in a rectangular channel was studied experimentally. The tire-averaged turbulence properties of pressure drop, mean velocity, turbulence intensities and turbulent shear stress were obtained principally at three Reynolds numbers. These quantities were affected by boundary motion with the largest effects occurring in the turbulence intensities and turbulent shear stress at low Reynolds numbers. The largest effects of boundary motion were detected in the energy spectral distributions of the turbulent velocity fluctuations and the turbulent shear stress. These distributions were distorted in the neighborhood of the frequency of the boundary motion. Experimental evidence was obtained to indicate that boundary- induced perturbations are transported in the direction of flow at the local value of the mean velocity.