载瘤动脉双向流固耦合动力学数值模拟分析  

Numerical Simulation on Bidirectional Fluid-Structure Interaction Kinetics of the Parent Artery

作　　者：王得辰 张俊婷[1] 樊佳伟 WANG Dechen;ZHANG Junting;FAN Jiawei(School of Applied Sciences,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学应用科学学院,山西太原030024

出　　处：《中北大学学报（自然科学版）》2023年第1期16-23,共8页Journal of North University of China(Natural Science Edition)

基　　金：山西省大学生创新项目(2021522)。

摘　　要：本文针对血液流动与载瘤动脉壁间的双向耦合作用,利用有限元数值模拟方法研究并探讨了不同弯曲度、不同瘤高因素下,载瘤动脉在单个心动周期内血液的流动状态,以及影响血管壁的应力、应力分布及破裂的动力学因素。研究结果表明:不同弯曲度的载瘤动脉,在1/4周期时刻动脉瘤内的血流量较小,变形达到最大;在近1/3周期时刻,动脉瘤底部出现较为紊乱的流动;在整个心动周期的最后时刻(t=0.6 s),动脉内血液流动趋于稳定。随着弯曲度的增加,动脉瘤内应力梯度增大,变形程度也增大,更容易发生形变;当弯曲度较小时,动脉瘤内血液流动相对紊乱,但其内部的应力分布较为均匀。随着瘤高的增高,动脉瘤下半部的应力增大,同时动脉瘤的变形也增大。Aiming at the bidirectional coupling effect between blood flow and the wall of the parent artery, we discuss the blood flow state of the parent artery in a single cardiac cycle under different curvatures and different tumor heights, as well as the dynamic factors affecting the stress, stress distribution and rupture of the vessel wall through the finite element numerical simulation method. According to the results, for the parent artery of different curvature, at the quarter cycle, the volume of blood flow in aneurysm is small, and the deformation reaches the maximum;and at closing one-third of the cycle, there is a relatively disordered flow at the bottom of its internal aneurysm;the blood flow in the artery tends to be stable at the last moment of the whole cardiac cycle(t=0.6 s).With the increase of the curvature, the stress gradient in the aneurysm increases, and the deformation degree increases, which makes it easier to deform;when the curvature is small, the blood flow in the aneurysm is relatively disordered, but the internal stress distribution becomes more uniform. With the increase of tumor height, the stress in the lower part of the aneurysm increases, and the deformation of the aneurysm also increases simultaneously.

关 键 词：动脉瘤 血流动力学 数值模型 双向流固耦合 

分 类 号：Q66[生物学—生物物理学]