Perktold K, Peter R
Institute of Mathematics, Technical University Graz, Austria.
J Biomed Eng. 1990 Jan;12(1):2-12. doi: 10.1016/0141-5425(90)90107-x.
The structure of pulsatile blood flow and wall shear stress in a 90 degrees T-bifurcation model is analysed numerically. The nonlinear Navier-Stokes equations for time-dependent incompressible Newtonian fluid flow are approximated using a newly developed pressure correction, finite element method. The wall shear stress is calculated from the finite element velocity field. The investigation shows viscous flow phenomena such as flow separation and stagnation and the distribution of high and low wall shear stress during the pulse cycle. Furthermore, the effect of a sharp corner at the bifurcation edge on the wall shear stress is analysed. Detailed local flow investigation is required to examine fluid dynamic contribution to the development of arterial diseases such as atherosclerosis and thrombosis.
对90度T型分叉模型中脉动血流的结构和壁面剪应力进行了数值分析。使用新开发的压力修正有限元方法对随时间变化的不可压缩牛顿流体流动的非线性纳维-斯托克斯方程进行了近似。壁面剪应力由有限元速度场计算得出。研究显示了诸如流动分离和停滞等粘性流动现象以及脉动周期中高低壁面剪应力的分布。此外，还分析了分叉边缘处尖角对壁面剪应力的影响。需要进行详细的局部流动研究，以检验流体动力学对动脉疾病（如动脉粥样硬化和血栓形成）发展的作用。
