Three-dimensional steady flow through a bifurcation.
Three-dimensional steady flow through a bifurcation.
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通过分叉的三维稳定流。
DOI：
10.1115/1.2891171
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
T. Keith
中科院分区：
文献类型：
--
作者：
C. Yung;K. J. De Witt;T. Keith
通过求解三维Navier-Stokes方程，对不可压缩牛顿流体通过对称分叉刚性通道的定常流动进行了数值分析。上游雷诺数范围为100至1500。分叉是对称的，分支角为60度，子血管与母血管的面积比为2.0。数值方法采用坐标变换和控制体积法将方程离散为有限差分形式，并采用SIMPLE算法进行计算。预测的速度模式与文献中的实验测量结果定性一致。结果还显示了二次流的影响，这是以前的二维模拟无法预测的。在分支的外壁附近观察到一个反向流动区域，除了最低雷诺数的情况。颗粒轨迹进行了检查，发现没有流体颗粒留在回流区。计算了分支内壁和外壁上的剪切应力。最大壁面剪应力位于分支顶点附近，与最近研究中报告的可能导致血管壁损伤的水平具有相同的数量级。
Steady flow of an incompressible, Newtonian fluid through a symmetric bifurcated rigid channel was numerically analyzed by solving the three-dimensional Navier-Stokes equations. The upstream Reynolds number ranged from 100 to 1500. The bifurcation was symmetrical with a branch angle of 60 deg and the area ratio of the daughter to the mother vessel was 2.0. The numerical procedure utilized a coordinate transformation and a control volume approach to discretize the equations to finite difference form and incorporated the SIMPLE algorithm in performing the calculation. The predicted velocity pattern was in qualitative agreement with experimental measurements available in the literature. The results also showed the effect of secondary flow which can not be predicted using previous two-dimensional simulations. A region of reversed flow was observed near the outer wall of the branch except for the case of the lowest Reynolds number. Particle trajectory was examined and it was found that no fluid particles remained within the recirculation zone. The shear stress was calculated on both the inner and the outer wall of the branch. The largest wall shear stress, located in the vicinity of the apex of the branch, was of the same order of magnitude as the level that can cause damage to the vessel wall as reported in a recent study.