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Transactions: WSEAS TRANSACTIONS ON FLUID MECHANICS
Transactions ID Number: 32-827
Full Name: Johan Renner
Position: Ph.D. Candidate
Age: ON
Sex: Male
Address: Linköping University
Country: SWEDEN
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E-mail address: johan.renner@liu.se
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Title of the Paper: Is a Flat Inlet Profile Sufficient for WSS Estimation in the Aortic Arch?
Authors as they appear in the Paper: Johan Renner, Dan Loyd, Toste Länne, Matts Karlsson
Email addresses of all the authors: johan.renner@liu.se, dan.loyd@liu.se, toste.lanne@liu.se, matts.karlsson@liu.se
Number of paper pages: 13
Abstract: Atherosclerosis is one of the main reasons for cardivascular disease which cause many deaths every year especially in the Western world. The development of atherosclerosis is strongly believed to be influenced by hemodynamic forces in the arteries e.g. wall shear stress (WSS). Estimations of WSS are therefore very important. By combining magnetic resonance imaging (MRI), image processing and computational fluid dynamic (CFD) simulations, it is possible to estimate subject specific WSS in the human arteries. The framework for performing such work includes i.e. using inlet boundary conditions which, however, will influence the final result i.e. the WSS distribution. This paper aims to investigate the influence of the inflow boundary condition in the human aorta with comparing two settings for the inflow: 1) subject specific inlet profile measured with MRI and 2) uniform profile with the subject specific mass flow rate. The analysis of WSS will be performed both on s!
patial location along the artery as well as on the temporal location in the cardiac cycle. Subject specific data have been used for geometry, inflow velocity profile and blood viscosity. The recommendation due to our findings from nine healthy subjects, is that a measured subject specific inlet boundary condition must be used in order to get a subject specific WSS distribution; the difference in WSS is 8-34% compared to using a mass-flow correct uniform profile. Temporal variations were clearly seen in the WSS differences due to the different inflow velocity profiles used. The lowest influence of the inlet boundary condition was found at peak velocity in the cardiac cycle. The aortic geometry does not form the flow in such extent (compared to the influence by inlet boundary condition) to obtain a more correct WSS distribution further away from the inlet at the systolic parts of the cardiac cycle. The shape of the vessel has only a significant influence at low velocities !
i.e. the diastolic phase of the cardiac cycle.
Keywords: Wall Shear Stress – Aorta - CFD - Subject Specific - Inlet Boundary Condition - Uniform Velocity Profile
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