Abstract
A new non-intrusive surface pressure and shear stress diagnostics technique is introduced in the present work. The technique is enabled by the unique ability of one-component molecular tagging velocimetry (1c-MTV) to provide measurements at very high spatial resolution (at every pixel along a tagged line of molecules) in the immediate proximity of surfaces. The utility of the new method to provide accurate measurements of the wall pressure and shear stress is demonstrated in an experiment involving a cylinder in cross flow at a Reynolds number of 6000. These measurements agree very well with experimental and computational data published in literature. The new technique is particularly advantageous in situations where embedding sensor arrays in the wall is impractical or cost/time prohibitive.
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Notes
Relative to the flow convection timescale to allow sufficient displacement of the tagged regions during the interrogation time.
Using data sets obtained from private communication with Visbal.
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Acknowledgments
This work is supported by AFOSR Grant Number FA9550-10-1-0342; program manager Dr. Douglas Smith.
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Olson, D.A., Naguib, A.M. & Koochesfahani, M.M. Measurement of the wall pressure and shear stress distribution using molecular tagging diagnostics. Exp Fluids 56, 171 (2015). https://doi.org/10.1007/s00348-015-2039-y
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DOI: https://doi.org/10.1007/s00348-015-2039-y