Hot wire spatial resolution effects in measurements of grid generated turbulence

A. Ashok; M. Hultmark; A. J. Smits; S. C.C. Bailey

Hot wire spatial resolution effects in measurements of grid generated turbulence

A. Ashok, M. Hultmark, A. J. Smits, S. C.C. Bailey

Research output: Contribution to conference › Paper › peer-review

Abstract

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.

Original language	English (US)
State	Published - 2011
Event	7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada Duration: Jul 28 2011 → Jul 31 2011

Other

Other	7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
Country/Territory	Canada
City	Ottawa
Period	7/28/11 → 7/31/11

All Science Journal Classification (ASJC) codes

Fluid Flow and Transfer Processes

Cite this

@conference{6b55ac75a13d4be6a2d4edcca7585df4,

title = "Hot wire spatial resolution effects in measurements of grid generated turbulence",

abstract = "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.",

author = "A. Ashok and M. Hultmark and Smits, {A. J.} and Bailey, {S. C.C.}",

note = "Funding 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).; 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 ; Conference date: 28-07-2011 Through 31-07-2011",

year = "2011",

language = "English (US)",

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TY - CONF

T1 - Hot wire spatial resolution effects in measurements of grid generated turbulence

AU - Ashok, A.

AU - Hultmark, M.

AU - Smits, A. J.

AU - Bailey, S. C.C.

N1 - Funding 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).

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85048578271&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048578271&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85048578271

T2 - 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011

Y2 - 28 July 2011 through 31 July 2011

ER -

Hot wire spatial resolution effects in measurements of grid generated turbulence

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