基于双向流固耦合的血管机器人外流场数值模拟

采用双向流固耦合的方法,对血管机器人的外流场进行数值模拟,为血管机器人外结构与运行参数设计提供参考.计算结果显示,伴随着血流脉动,血管的变形呈现周期性喇叭形扩大—向前传递—恢复原状,变形较大的区域主要集中在血管机器人迎流面,同时机身旋转的作用快速将血液输送至背流面,使背流面的变形比机身变形略大;进而给出了壁面剪切应力与血管变形间的关系式,揭示壁面剪切应力随血管变形而变化的规律.最后,分析了血管弹性对血管机器人推动性能的影响,结果表明,血管弹性对血管机器人推动性能影响不大.

Numerical Simulation on Flow Field of the Vascular Robot Based on Bidirectional FSI

The two-way fluid-structure interaction method is used to simulate the flow field of the vascular robot, and the obtained data could provide a reference for vessel robot design. The results show that the deformation of blood vessels is cyclical flared expand-forward pass-restoration, and large deformation happens mainly in the vascular robotic surface of facing the flow, while the action of the rotating body, the blood is quickly transported to the back flow of robot, so that the deformation of the back flow surface is slightly larger than that of the body; wall shear stress increases with the increase of the deformation of the blood vessel, and then the relationship of wall shear stress and wall deformation is given. The influence of wall elastic on driven performance of vascular robot is analyzed, and the results show that the effect of wall elastic on driven performance of vascular robot is not significant.