Experimental investigation of compliant wall deformation in a turbulent channel flow

2016 ◽  
Vol 140 (4) ◽  
pp. 3331-3331
Author(s):  
Cao Zhang ◽  
Jin Wang ◽  
Joseph Katz
Keyword(s):  
Experimental Investigation ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Compliant Wall ◽  
Wall Deformation

Time-Resolved Simultaneous Measurements of Flow Field and Surface Deformation of Turbulent Channel Flow Over a Compliant Wall

2014 ◽  
Author(s):  
Cao Zhang ◽  
Rinaldo L. Miorini ◽  
Joseph Katz
Keyword(s):  
Channel Flow ◽  
Surface Deformation ◽  
Measurement Techniques ◽  
Low Frequency ◽  
Turbulent Channel Flow ◽  
Initial Step ◽  
Time Resolved ◽  
Compliant Wall ◽  
Wall Deformation ◽  
Frequency Features

As an initial step in our effort to investigate the interaction of a turbulent channel flow with a compliant wall, this paper focuses on the measurement techniques. Two noninvasive optical techniques, namely tomographic PIV (TPIV) and Mach-Zehnder Interferometry (MZI), are integrated to simultaneously measure the time-resolved, wall-normal deformation of the compliant transparent wall and the 3D velocity field of a turbulent channel flow above it. The two systems utilize the same laser, but different cameras. The paper provides a description of the optical setup, detailed information about calibration of the MZI system, as well as sample combined 3D velocity distributions and wall deformations. The measured wall deformation can be decomposed into low frequency structure modes, and higher frequency features that appear to advect with the flow.

Simultaneous Measurements of 3D Flow and Wall Deformation in a Compliant Wall Turbulent Channel Flow

2014 ◽  
Author(s):  
Cao Zhang ◽  
Rinaldo L. Miorini ◽  
Joseph Katz
Keyword(s):  
Channel Flow ◽  
Sodium Iodide ◽  
Surface Deformation ◽  
Turbulent Channel Flow ◽  
Working Fluid ◽  
3D Flow ◽  
Simultaneous Measurements ◽  
Compliant Wall ◽  
Wall Deformation ◽  
Phase Evaluation

This study focuses on the interaction of a turbulent channel flow at Reτ=2310 over a flat, compliant boundary made of PDMS (Polydimethylsiloxane). Two noninvasive optical techniques, namely tomographic PIV (TPIV) and Mach-Zehnder Interferometry (MZI), are integrated to perform simultaneous measurements of the 3D flow field and the corresponding surface deformation. The measurements are performed in a refractive index-matched facility, where the working fluid is aqueous solution of sodium iodide (NaI). The TPIV measurement volume is 30×10×10 mm3 in the streamwise, wall-normal and spanwise directions, respectively. The MZI phase evaluation and unwrapping algorithms have been developed, calibrated and implemented. Preliminary results show qualitative correlation between wall deformation and flow structures near the wall.

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