Haemodynamics in a 3D 90-degree bifurcation

Authors: van Wyk, S.v.W., Prahl Wittberg, L., Fuchs, L.F.
Document Type: Conference
Pubstate: Published
Journal: Proc. of the ECCOMAS Thematic International Conference on Simulation and Modeling of Biological Flows (SIMBIO 2011), Sept. 21 -23, 2011, VUB, Brussels, Belgium
Year: 2011


The transport behaviour of the haematocrit in the larger arteries is important in defining the variations in viscosity of blood. In this study, a finite volume method is used in order to simulate the blood flow and haematocrit transport through a large 3D human-like 90-degree bifurcation. The simulations are carried out to investigate the importance of explicitly modelling the non-Newtonian viscosity of blood regarding defining the flow. It is expected to be especially important in the regions surrounding a bifurcation. The main focus is to compare non-Newtonian to Newtonian behaviour of the flow through important parameters such as pressure losses, mean viscosity variations and bulk transport properties of haematocrit. The study considers a broad range of physiological and pulsatile flow conditions, and displays the importance of modelling blood flow as a non-Newtonian fluid. The results have a relevant impact regarding the possible discrepencies in important physiological parameters such as wall shear stress (WSS), when coupling the haematocrit field data back to the viscosity models.