摘要(英) |
Numerical simulation of blood flow in the arteries becomes an invaluable tools to help both of the physicians to plan the surgery procedure to reduce the risk of surgery and the researchers to understand the cardiovascular diseases. To ease the numerical difficulties of blood flow simulation, blood is often assumed to be Newtonian fluid as the first approximation. However, the shear thinning effect is significant in large arteries due to the dramatic change of the shear stress during a cardiac cycle and the non-homogeneous
properties of blood. Moreover, the recirculation happens frequently in the low shear rate region. To compute accurately the wall shear stress that provides more useful information to predict the formation of intimal hyperplasia, it is necessary to take the rheological
effect of blood flows in to account. In this study, the non-Newtonian blood flows in different complexity of artery were numerically investigated by using 3D fully parallel incompressible fluid solver. Our fluid solver is developed based on generalized Newtonian fluid model, where the viscosity is the function of rate of strain tensor. More specifically, the more commonly-used model for blood flow simulation, the Carreau-Yasuda model,
compared with Newtonian model are reported, including the investigation how the wall shear stress distribution and the streamlines and pressure distribution depend on different physiological conditions and arterial geometries. |
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