P6.03 A FSI MODEL OF CAROTID ARTERIES WITH VISCOELASTIC WALL BEHAVIOUR

DOI

10.1016/j.artres.2013.10.184How to use a DOI?

Abstract

Objectives: Human carotid arteries exhibit viscoelastic behaviour characterised by hysteresis of the pressure-diameter relation and longitudinal wall motion¹. Ultrasound techniques have been used to measure vessel wall displacements, as well as pressure and diameter waveforms, from which viscoelastic properties can be derived². The aim of this study is to develop a fully-coupled numerical model for pulsatile flow in human arteries with viscoelastic wall behaviour.

Methods: An idealized common carotid arterial geometry was adopted first, so that comparison could be made between the numerical and analytical solutions. A linear viscoelastic material model was employed where Prony series were used to describe shear and bulk moduli³. The flow was assumed to be laminar flow, and physiologically realistic pressure and flow waveforms were imposed at the model inlet and outlet respectively⁴. Two-way coupling of fluid structure interaction was achieved by combining Ansys and Fluent.

Results: It was found that the viscoelastic behaviour of the vessel wall caused a phase lag between the radial wall distension and pressure waveform, as shown in Figure 1. The predicted pressure-diameter hysteresis loop (Figure 2) is in good agreement with the analytical solution. The numerical model presented here is being extended to realistic carotid arteries with and without the influence of arterial diseases (e.g. hypertension and atherosclerosis).

Open Access

This is an open access article distributed under the CC BY-NC license.

TY  - JOUR
AU  - Z. Wang
AU  - X.Y. Xu
AU  - N.B. Wood
PY  - 2013
DA  - 2013/11/11
TI  - P6.03 A FSI MODEL OF CAROTID ARTERIES WITH VISCOELASTIC WALL BEHAVIOUR
JO  - Artery Research
SP  - 153
EP  - 154
VL  - 7
IS  - 3-4
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2013.10.184
DO  - 10.1016/j.artres.2013.10.184
ID  - Wang2013
ER  -