CFD Simulation of Non-Newtonian Effect on Hemodynamics Characteristics of Blood Flow through Benchmark Nozzle

Abstract

Blood flowing through medical devices may be subject to hemolysis and thrombosis. For hemolysis, this relationship is often expressed as a shear stress/exposure time relationship. The earlier research found that the blood is a Newtonian fluid, yet blood vessel stream and stress pattern can be influenced by rheological properties of the blood. Anyway, later, examination on blood stream in a carotid bifurcation demonstrates the speed dispersion of a stream could be influenced by shear diminishing non-Newtonian property of blood. Objective of present study is to compare the hemodynamics properties between Newtonian and non-Newtonian model namely, Carreau-Yasuda. The simulation was performed on the idealized nozzle for cardiovascular medical device at Reynolds number of Re = 500. The results were obtained using CFD software Ansys Fluent. The result successfully reveals the mode shape of the velocity graph which was obtained in previous study are identical. Result also found that Newtonian produce more intensity of hemodynamic properties. Furthermore, result also shows that the Newtonian blood viscosity has a high number of wall shear stress by 3% and it will potentially cause blood clots and thrombosis to the patient. This present study can be acknowledged as references for new anticipated of non-Newtonian effect of this cardiovascular medical devices. This paper presented the initial step toward more general goal of simulate implanted in body medical device and to help to improve CFD for biomedical field.