Computational fluid dynamics simulations demonstrated that the Carreau Law viscosity model yielded maximum wall shear stress values of 25-125 Pa, compared to 1.5-10 Pa for Newtonian and Power Law models.
Small changes in stenosis dimensions significantly impact flow dynamics, and the choice of viscosity model (especially Carreau Law) drastically alters wall shear stress estimations in computational fluid dynamics.
Stenosis of blood vessels is a common cardiovascular issue, and numerical simulation provides an accessible alternative to experimental studies. This study utilizes computational fluid dynamics (CFD) to simulate blood flow dynamics in stenotic vessels with varying dimensions and viscosity models, offering insights into how blood behaves under different conditions. Validation, conducted by comparing results with experimental data in the post-stenotic region, shows acceptable differences. Nine stenosis models were analyzed by altering stenosis length (from 13.75 mm to 27.5 mm) and height (from 2.2 mm to 4.4 mm) while testing three viscosity models: Newtonian, Power Law, and Carreau Law. Key variables such as wall shear stress (WSS), pressure drop, and maximum throat velocity were determined, and recirculation zones and streamline contours were observed. The results indicate that small changes in stenosis dimensions significantly impact flow dynamics. While Newtonian and Power Law models produce similar outcomes, different viscosity models alter flow results. Carreau Law shows maximum WSS values between 25 Pa and 125 Pa, compared to 1.5 to 10 Pa for the Newtonian and Power Law models under the same conditions.
Çutay et al. (Mon,) conducted a other in Stenosis of blood vessels. Computational fluid dynamics (CFD) simulation vs. Different viscosity models (Newtonian, Power Law, Carreau Law) and stenosis dimensions was evaluated on Wall shear stress (WSS), pressure drop, and maximum throat velocity. Computational fluid dynamics simulations demonstrated that the Carreau Law viscosity model yielded maximum wall shear stress values of 25-125 Pa, compared to 1.5-10 Pa for Newtonian and Power Law models.