弯曲圆管入口段定常流动的三维数值模拟

目的 研究定常流动条件下弯曲圆管入口段内的流动情况。方法 用有限体积法对弯曲圆管入口段定常流动作三维数值模拟。结果 分别计算了管内流线、截面等速度线、沿对称面直径的速度剖面和壁面切应力分布等。沿对称面直径的速度剖面计算值与实验结果吻合很好。结论 弯管的外侧壁是高切应力区，内侧壁是低切应力区，证实内侧壁是动脉粥样斑块的高发区。

Three-dimensional Numerical Simulation of Steady Flow at the Entrance of Curved Pipe

Objective To study steady flow characteristics at the entrance of curved pipe. Methods Three-dimensional numerical simulation was performed by finite volume method. Results The streamline,axial constant velocity lines in the cross-section,velocity profile along the diameter of the cross-section in symmetric plane,and the distribution of wall shear stress were calculated respectively.The calculated values of the velocity profile along the diameter of the cross-section were found to coincide fairly well with experimental results. Conclusion The outside wall of curved pipe was the region with high shear stress while the inside wall was the one with low shear stress, which might explained that the preferential region of atherosclerosis.