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Uncertainty assessment of coupled Digital Image Correlation and Particle Image Velocimetry for fluid-structure interaction wind tunnel experiments experiments

Uncertainty assessment of coupled Digital Image Correlation and Particle Image Velocimetry for fluid-structure interaction wind tunnel experiments experiments
Uncertainty assessment of coupled Digital Image Correlation and Particle Image Velocimetry for fluid-structure interaction wind tunnel experiments experiments
The development of advanced composite structures for maritime and aerospace applications requires the ability to quantify their actual performance under known fluid loads. One example is the need to investigate the differences in fluid–structure response of passive adaptive composite structures. A wind tunnel based method is used to quantify the structural behaviour, and fluid response, of a flexible aerofoil under fluid loading. The technique measures the deflection of the structure, with high speed stereoscopic Digital Image Correlation (DIC). The tip vortex position is measured using high resolution stereoscopic Particle Image Velocimetry (PIV). The accuracy of the two full-field optical measurement systems is quantified and the effect of optical interactions is assessed. A flexible NACA0015 rectangular plan-form aerofoil of 0.9 m span and aspect ratio of two is subjected to aerodynamic loading within a closed circuit wind tunnel. The wind speed was varied from 10 to 25 m/s within a 3.5 m x 2.4 m working section. The structural response is measured simultaneously with the fluid flow field around the tip vortex. The tip vortex core, which moved by ?62 mm at the highest wind speed, is directly compared to the deformation of the structure, which deflected by ?58 mm. A maximum foil twist of ?0.6° was observed. The DIC accuracy is evaluated in static and transient conditions for translational and rotational movement. The DIC maximum error for translations, greater than or equal to 0.5 mm, is less than 3% and less than 0.6% in dynamic motions. The DIC total error for rotations is less than 5% in static motions and 1% in dynamic rotations. The PIV uncertainty is quantified a posteriori providing the errors due to the correlation algorithm and the experimental setup. The mean in-plane velocity component uncertainties in the vortex region varied between 1.2% and 3.5% depending on flow speed (?0.1 px). The mean out-of-plane velocity uncertainty around the vortex varies between 2% and 3.3% depending on flow speed.
0889-9746
125-140
Marimon Giovannetti, Laura
9fada37b-24b2-4235-aa91-e8c25837953d
Banks, Joseph
3e915107-6d17-4097-8e77-99c40c8c053d
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Boyd, Stephen
bcbdefe0-5acf-4d6a-8a16-f4abf7c78b10
Marimon Giovannetti, Laura
9fada37b-24b2-4235-aa91-e8c25837953d
Banks, Joseph
3e915107-6d17-4097-8e77-99c40c8c053d
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Boyd, Stephen
bcbdefe0-5acf-4d6a-8a16-f4abf7c78b10

Marimon Giovannetti, Laura, Banks, Joseph, Turnock, Stephen and Boyd, Stephen (2017) Uncertainty assessment of coupled Digital Image Correlation and Particle Image Velocimetry for fluid-structure interaction wind tunnel experiments experiments. Journal of Fluids and Structures, 68, 125-140. (doi:10.1016/j.jfluidstructs.2016.09.002).

Record type: Article

Abstract

The development of advanced composite structures for maritime and aerospace applications requires the ability to quantify their actual performance under known fluid loads. One example is the need to investigate the differences in fluid–structure response of passive adaptive composite structures. A wind tunnel based method is used to quantify the structural behaviour, and fluid response, of a flexible aerofoil under fluid loading. The technique measures the deflection of the structure, with high speed stereoscopic Digital Image Correlation (DIC). The tip vortex position is measured using high resolution stereoscopic Particle Image Velocimetry (PIV). The accuracy of the two full-field optical measurement systems is quantified and the effect of optical interactions is assessed. A flexible NACA0015 rectangular plan-form aerofoil of 0.9 m span and aspect ratio of two is subjected to aerodynamic loading within a closed circuit wind tunnel. The wind speed was varied from 10 to 25 m/s within a 3.5 m x 2.4 m working section. The structural response is measured simultaneously with the fluid flow field around the tip vortex. The tip vortex core, which moved by ?62 mm at the highest wind speed, is directly compared to the deformation of the structure, which deflected by ?58 mm. A maximum foil twist of ?0.6° was observed. The DIC accuracy is evaluated in static and transient conditions for translational and rotational movement. The DIC maximum error for translations, greater than or equal to 0.5 mm, is less than 3% and less than 0.6% in dynamic motions. The DIC total error for rotations is less than 5% in static motions and 1% in dynamic rotations. The PIV uncertainty is quantified a posteriori providing the errors due to the correlation algorithm and the experimental setup. The mean in-plane velocity component uncertainties in the vortex region varied between 1.2% and 3.5% depending on flow speed (?0.1 px). The mean out-of-plane velocity uncertainty around the vortex varies between 2% and 3.3% depending on flow speed.

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More information

Accepted/In Press date: 12 September 2016
e-pub ahead of print date: 28 October 2016
Published date: January 2017
Additional Information: The detailed 3D geometry of the specimen and the data presented in the benchmark test are available from the University of Southampton repository at http://dx.doi.org/10.5258/SOTON/400464
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 400470
URI: http://eprints.soton.ac.uk/id/eprint/400470
ISSN: 0889-9746
PURE UUID: 21664ddf-60e3-4988-84f6-73115490b9ba
ORCID for Joseph Banks: ORCID iD orcid.org/0000-0002-3777-8962
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400

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Date deposited: 16 Sep 2016 12:51
Last modified: 27 Apr 2022 04:15

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