Key result
Newtonian viscosity models underpredict carotid aneurysm wall shear stress by ~32% versus non-Newtonian models.
Why the study?
Intracranial aneurysms are serious, life-threatening conditions, and computational fluid dynamic investigation was needed to learn flow characteristics on aneurysm-afflicted common carotid arteries.
Computational fluid dynamic modeling demonstrates that aneurysmal morphology and blood viscosity models significantly affect wall shear stress distribution in the common carotid artery.
WSS modeling in carotid aneurysms requires viscosity-specific calibration at low flows; hypothesis-generating, needs human validation before clinical use.
Aneurysm is a vascular disorder characterized by abnormal focal dilation of an artery which is considered as a serious and potentially life-threatening condition. An estimated 2%–5% of the general population is affected by intracranial aneurysms. Through computational fluid dynamic (CFD) investigation, this study aims to learn the flow characteristic on aneurysm afflicted common carotid artery (CCA). This study focused on the velocity, wall shear stress (WSS) and sensitivity of blood viscosity of the CCA flow. CFD method was done to 3 simplified model of CCA which were normal, saccular aneurysm, fusiform aneurysm CCA model. The simulation was done with different blood viscosity model which were Newtonian and non-Newtonian. The high velocity area of blood flow has corresponding effect to the increase of the WSS distribution to the wall of the geometry. The results also showed at certain value of low velocity area, WSS distribution for different blood viscosity model was deviated significantly.
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Saufi et al. (2023) studied Carotid artery aneurysm. Non-Newtonian blood viscosity model (Carreau-Yasuda) vs. Newtonian blood viscosity model was evaluated on Wall shear stress (WSS) and velocity distribution. Computational fluid dynamics simulations of carotid artery aneurysms showed that Newtonian blood viscosity models significantly underpredict wall shear stress at low blood velocities (<0.1 m/s) compared to non-Newtonian models, with deviations up to 32%.
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