Comparison of blood rheological models in patient specific cardiovascular system simulations

Newtonian, Quemada and Casson blood viscosity models are implemented in order to simulate the rheological behavior of blood under pulsating flow conditions in a patient specific iliac bifurcation. The influence of the applied blood constitutive equations is monitored via the wall shear stress (WSS)...

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Bibliographic Details
Published in:Journal of hydrodynamics. Series B 2017-04, Vol.29 (2), p.293-304
Main Authors: Skiadopoulos, Anastasios, Neofytou, Panagiotis, Housiadas, Christos
Format: Article
Language:English
Subjects:
Blood flow simulation
Engineering
Engineering Fluid Dynamics
geometry reconstruction
Hydrology/Water Resources
non-Newtonian models
Numerical and Computational Physics
patient specific geometries
pulsating flow
Simulation
wall shear stress
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Summary:Newtonian, Quemada and Casson blood viscosity models are implemented in order to simulate the rheological behavior of blood under pulsating flow conditions in a patient specific iliac bifurcation. The influence of the applied blood constitutive equations is monitored via the wall shear stress (WSS) distribution, magnitude and oscillations, non-Newtonian importance factors, and viscosity values according to the shear rate. The distribution of WSS on the vascular wall follows a pattern which is independent of the rheological model chosen. On the other hand, the WSS magnitude and oscillations are directly related to the blood constitutive equations applied and the shear rate. It is concluded that the Newtonian approximation is satisfactory only in high shear and flow rates. Moreover, the Newtonian model seems to overestimate the possibility for the formation of atherosclerotic lesions or aneurysms at sites of the vascular wall where the WSS are oscillating.
ISSN:1001-6058
1878-0342
DOI:10.1016/S1001-6058(16)60739-4