Key result
Carreau and Newtonian models yield significantly divergent shear stress predictions in stenosed arteries.
Why the study?
The accuracy of different non-Newtonian rheological models in predicting hemodynamic transport phenomena in stenosed arteries is unclear.
Different rheological models yield significantly different predictions for wall shear stress in stenosed arteries, highlighting the importance of model selection in computational hemodynamics.
Answers are grounded in this paper and cite their sources.
Non-Newtonian models may refine wall shear predictions in stenosed vessels; leaves open which best informs patient-specific risk assessment.
Hemodynamic transport in the stenosed blood vessel has been numerically investigated with five non-Newtonian rheological models. The results from Casson viscosity model, Carreau model, Cross model, power law viscosity model, and Quemada viscosity model as well as Newtonian model were compared to capture the physics at the arterial wall. At the inlet of a long artery, three different pulsating profiles are considered. Detailed flow statistics of the flow field were calculated by solving transient form of Navier-Stokes equation in an axi-symmetric domain. From the simulation data, wall shear stress and oscillatory shear index were calculated. The results show that among different rheological models, the predictions from Carreau model as well as Newtonian model differ significantly with other four models showing similar behaviour. The results demonstrate that the degree of stenoses have a significant effect on oscillatory shear index and recirculation length.
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Bit et al. (2014) studied Stenosed artery. Non-Newtonian rheological models (Casson, Carreau, Cross, power law, Quemada) vs. Newtonian model was evaluated on Wall shear stress and oscillatory shear index. Predictions of wall shear stress and oscillatory shear index from the Carreau and Newtonian models differed significantly from the Casson, Cross, power law, and Quemada models in stenosed arteries.
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