Effect of Side Looking Acoustic Doppler Velocimeter (ADV) Presence on Turbulent Flow Field in Compound Channel

Acoustic doppler velocimetry (ADV) is a common measurement technique for flow field in open-channel flows. Since ADV is an intrusive measurement method, the presence of ADV probe may causes changes in flow structure and may intensify the turbulence in sampling volume which can affect the experimental results and analysis. To explore these effects, in this study, particle image velocimetry (PIV) was employed to measure the flow field with and without the presence of a side looking ADV probe in a compound channel. The results of this research showed that the intrusion of ADV in the flow field increases the streamwise velocity in the ADV measurement volume by 1.7%. The more enhanced effect is also notified in the secondary currents so that in the present test conditions, the presence of the side looking ADV causes a decrease in lateral velocity by 4.5 times and causes an increase in vertical velocity by 2.7 times. Investigation of the turbulent intensities showed that the presence of the side looking ADV causes an increment in streamwise turbulent intensity, while does not significantly affect the lateral and vertical components. Furthermore, examining vertical Reynolds shear stress measurement data with or without the presence of ADV showed that the measured values differ in the two states and the presence of ADV decreases 30% of Reynolds shear stress in place of the control volume.