The effect of the X-wire probe resolution in measurements of isotropic turbulence

Title: The effect of the X-wire probe resolution in measurements of isotropic turbulence
Creator: Burattini, Paolo
Relation: Measurement Science & Technology Vol. 19, Issue 11
Publisher Link: http://dx.doi.org/10.1088/0957-0233/19/11/115405
Publisher: Institute of Physics (IOP) Publishing
Resource Type: journal article
Date: 2008
Description: A comprehensive analysis of the resolution effects of a cross-wire probe for velocity measurements is presented. The results, which are obtained from DNS of isotropic turbulence and from a model spectrum of the turbulent kinetic energy, consider different lengths of the wires, separations between the wires, as well as time sampling rates of the velocity signal. The impact of the resolution is estimated on several quantities, such as the velocity variance, the velocity derivative variance and some isotropy estimators. In general, the lack of resolution has a larger effect on the statistics of the velocity derivatives. However, it is found that a particular surrogate of the kinetic energy dissipation rate remains relatively unaffected even when the separation between the wires is large. Further, the correction factors derived from the model spectrum systematically overcorrect the underresolved measurements.
Subject: hot wire; homogeneous isotropic turbulence; X-wire
Identifier: uon:5159
Identifier: http://hdl.handle.net/1959.13/43025
Identifier: ISSN:0957-0233
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