Evaluation of hot-wire measurements in wall shear turbulence using a direct numerical simulation database
✍ Scribed by Yuji Suzuki; Nobuhide Kasagi
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 764 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0894-1777
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✦ Synopsis
mAn error analysis for hot-wire/film measurements in wall shear turbulence was performed using a direct numerical simulation (DNS) database of turbulent channel flow. Fairly complete models of single-and dual-sensor probes were considered so that the effects of spatial resolution as well as neglected velocity components were investigated quantitatively. It was found that the values measured near the wall should be primarily dependent upon the sensor spacing; that is, wall-normal and spanwise turbulent intensities were overestimated markedly, whereas streamwise intensity was slightly underestimated. These errors proved to be caused by strong anisotropy as well as fine scales of the near-wall turbulence. A correction method using two-point correlation functions is also presented. These analytical results were confirmed by a physical experiment with an X-array hot-film probe.