Shear stress rosettes capture the complex flow physics in diseased arteries

Vamsi Krishna, C and Chandran Suja, VK and Watton, PN and Arakeri, JH and Gundiah, N (2020) Shear stress rosettes capture the complex flow physics in diseased arteries. In: Journal of Biomechanics, 104 .

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Abstract

Wall shear stress (WSS) is an important parameter in arterial mechanobiology. Various flow metrics, such as time averaged WSS (TAWSS), oscillatory shear index (OSI), and transWSS, have been used to characterize and relate possible WSS variations in arterial diseases like aneurysms and atherosclerosis. We use a graphical representation of WSS using shear rosettes to map temporal changes in the flow dynamics during a cardiac cycle at any spatial location on the vessel surface. The presence of secondary flows and flow reversals can be interpreted directly from the shape of the shear rosette. The mean WSS is given by the rosette centroid, the OSI by the splay around the rosette origin, and the transWSS by its width. We define a new metric, anisotropy ratio (AR), based on the ratio of the length to width of the shear rosette, to capture flow bi-directionality. We characterized the flow physics in controls and patient specific geometries of the ascending aorta (AA) and internal carotid artery (ICA) that have fundamentally different flow dynamics due to differences in the Reynolds and Womersley numbers. The differences in the flow dynamics are well reflected in the shapes of the WSS rosettes and the corresponding flow metrics.

Item Type:	Journal Article
Publication:	Journal of Biomechanics
Publisher:	ELSEVIER SCI LTD
Additional Information:	The copyright of this article belongs to ELSEVIER SCI LTD
Keywords:	Hemodynamics; Secondary flow; Shear stress, Aneurysms; Arterial flow; Bidirectionality; Graphical representations; Internal carotid artery; Oscillatory shear index; Wall shear stress; Womersley numbers, Shear flow
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	30 Jun 2020 06:46
Last Modified:	30 Jun 2020 06:46
URI:	http://eprints.iisc.ac.in/id/eprint/64900

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