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3D analysis of vortical structures in an abdominal aortic aneurysm by stereoscopic PIV

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Abstract

The present work presents an experimental in vitro three-dimensional analysis of the flow dynamics in an abdominal aortic aneurysm (AAA) through stereoscopic particle image velocimetry (SPIV) measurements. The experimental set-up mimics the pathophysiological context involving a shear thinning blood analogue fluid, compliant AAA and aorto-iliac bifurcation walls and controlled inlet and outlet flow rate and pressure waveforms as well as working fluid temperature. SPIV was carefully calibrated and conducted to assess the three velocity components in the AAA volume. For the first time in the literature, the 3D vortex ring genesis, propagation, and vanishing in the AAA bulge are experimentally described and quantified. In comparison with classical 2-component PIV measurements (2C PIV), the third component of the velocity vector was shown to be of importance in such a geometry, especially, during the deceleration phase of the flow rate. The 3D velocity magnitude reached up more than 20 % of the 2D one showing that 2C PIV are definitively not accurate enough to provide a complete description of flow behaviour in an AAA. In addition to potential clinical implications of a full 3D vortex ring description in AAA evolution, the 3D in vitro experimental quantification of the flow dynamics carried out in the present study offers an interesting tool for the validation of fluid–structure interaction numerical studies dealing with AAA.

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Acknowledgments

The authors thank the Labex MEC ANR-11-LABX-0092 for financial support.

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Correspondence to Valérie Deplano.

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Deplano, V., Guivier-Curien, C. & Bertrand, E. 3D analysis of vortical structures in an abdominal aortic aneurysm by stereoscopic PIV. Exp Fluids 57, 167 (2016). https://doi.org/10.1007/s00348-016-2263-0

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  • DOI: https://doi.org/10.1007/s00348-016-2263-0

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