We use grid generated homogeneous isotropic turbulence as a benchmark flow to test the effects of spatial resolution on turbulence measurements with hot wires. The grid turbulence is generated in a low speed 0.6 m by 0.9 m closed circuit wind tunnel using a square mesh grid placed at the test section inlet. Measurements of the turbulence statistics and spectra downstream of the grid were made using hot-wires of varying length. An empirical correlation for the attenuation of the energy due to spatial filtering is constructed as a function of the parameter l/ν. The effect of spatial filtering on the streamwise spectrum function is observed to extend to almost all wavenumbers, even those significantly lower than the length of the hot wire itself. It is shown that these grid turbulence results relate directly to the nearwall region of wall-bounded flows, where the effects of spatial filtering are most acutely felt.
|State||Published - 2011|
|Event||7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada|
Duration: Jul 28 2011 → Jul 31 2011
|Conference||7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011|
|Period||7/28/11 → 7/31/11|
Bibliographical noteFunding Information:
This work was supported by ONR Grant N00014-09-1-0263 (Program Manager Ron Joslin) and NSF Grant CBET-1064257 (Program Manager Henning Winter).
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ASJC Scopus subject areas
- Fluid Flow and Transfer Processes