Abstract
We investigate spatial resolution issues in hot-wire anemometry measurements of turbulence intensity and energy spectra. Single normal hot-wire measurements are simulated by means of filtering direct numerical simulation (DNS) of turbulent channel flow at \(Re_\tau = 934\). Through analysis of the two-dimensional energy spectra from the DNS, the attenuation of the small-scale energy levels is documented, especially in the near-wall region. The missing energy displays anisotropic characteristics, and an attempt is made to model this using an empirical equation, thus providing a correction scheme for all wall normal locations. The empirical model is assessed using experimental boundary layer data and shown to effectively correct both the streamwise one-dimensional energy spectra and turbulence intensity at a Reynolds number significantly above that of the DNS.
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Acknowledgments
The authors wish to gratefully thank Prof. R. D. Moser for making the Re τ = 934, DNS data available, and the financial support of the Australian Research Council. The authors are also grateful for the support from Australian Partnership for Advanced Computing (APAC) and also Victorian Partnership for Advanced Computing (VPAC) for the computational time.
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Chin, C., Hutchins, N., Ooi, A. et al. Spatial resolution correction for hot-wire anemometry in wall turbulence. Exp Fluids 50, 1443–1453 (2011). https://doi.org/10.1007/s00348-010-1003-0
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DOI: https://doi.org/10.1007/s00348-010-1003-0