In this section
@article{Manchester:2021:10.1007/s13239-021-00536-9,
author = {Manchester, E and Pirola, S and Salmasi, M and O'Regan, D and Athanasiou, T and Xu, X},
doi = {10.1007/s13239-021-00536-9},
journal = {Cardiovascular Engineering and Technology},
pages = {438--453},
title = {Analysis of turbulence effects in a patient-specific aorta with aortic valve stenosis},
url = {http://dx.doi.org/10.1007/s13239-021-00536-9},
volume = {12},
year = {2021}
}
TY - JOUR
AB - Blood flow in the aorta is often assumed laminar, however aortic valve pathologies may induce transition to turbulence and our understanding of turbulence effects is incomplete. The aim of the study was to provide a detailed analysis of turbulence effects in aortic valve stenosis (AVS).Methods:Large-eddy simulation (LES) of flow through a patient-specific aorta with AVS was conducted. Magnetic resonance imaging (MRI) was performed and used for geometric reconstruction and patient-specific boundary conditions. Computed velocity field was compared with 4D flow MRI to check qualitative and quantitative consistency. The effect of turbulence was evaluated in terms of fluctuating kinetic energy, turbulence-related wall shear stress (WSS) and energy loss.Results:Our analysis suggested that turbulence was induced by a combination of a high velocity jet impinging on the arterial wall and a dilated ascending aorta which provided sufficient space for turbulence to develop. Turbulent WSS contributed to 40% of the total WSS in the ascending aorta and 38% in the entire aorta. Viscous and turbulent irreversible energy losses accounted for 3.9 and 2.7% of the total stroke work, respectively.Conclusions:This study demonstrates the importance of turbulence in assessing aortic haemodynamics in a patient with AVS. Neglecting the turbulent contribution to WSS could potentially result in a significant underestimation of the total WSS. Further work is warranted to extend the analysis to more AVS cases and patients with other aortic valve diseases.
AU - Manchester,E
AU - Pirola,S
AU - Salmasi,M
AU - O'Regan,D
AU - Athanasiou,T
AU - Xu,X
DO - 10.1007/s13239-021-00536-9
EP - 453
PY - 2021///
SN - 1869-408X
SP - 438
TI - Analysis of turbulence effects in a patient-specific aorta with aortic valve stenosis
T2 - Cardiovascular Engineering and Technology
UR - http://dx.doi.org/10.1007/s13239-021-00536-9
UR - https://link.springer.com/article/10.1007%2Fs13239-021-00536-9
UR - http://hdl.handle.net/10044/1/88794
VL - 12
ER -
Room 1M17, ACE Extension Building
Department of Chemical Engineering
Imperial College London, South Kensington Campus
London, SW7 2AZ, UK
Tel: +44 (0)207 594 2562