基于ABAQUS的升主动脉置换术术后血流数值模拟

目的:为研究人工升主动脉置换术治疗Stanford A型主动脉夹层后的血流动力学规律，采集临床CT图像，构建术后个性化主动脉流场几何模型。基于计算流体动力学对其进行数值模拟，得到术后流域壁面压力分布和流速分布两个力学指标，从而分析术后流域规律。方法:采集术后CT图像DICOM文件并应用影像后处理软件MIMICS进行三维重构及优化获得几何模型，再将该流域模型导入网格划分软件进行CFD网格划分，最后将网格文件导入ABAQUS/CFD模块进行多周期瞬态模拟。结果:通过模拟计算，得到术后主动脉在心动周期不同时刻的血流动力学参数。结论:血流动力学参数与边界条件密切相关。主动脉内复杂流场环境与心血管疾病存在一定联系。数值模拟可为人工血管置换术后病情发展提供参考。

ABAQUS-based numerical simulation of blood flow after ascending aorta replacement

Abstract: Objective To construct a personalized aortic flow geometric model according to clinical CT images for studying the hemodynamics after ascending aorta replacement for Stanford A-type aortic dissection, and to analyze hemodynamic laws at postoperative blood drainage area by two mechanical indexes, namely the wall pressure distribution and flow velocity distribution at postoperative blood drainage area, which were obtained by numerical simulation based on computational fluid dynamics. Methods The postoperative CT images in DICOM format were collected, and then image post-processing software MIMICS was used for three-dimensional reconstruction and optimization, thereby obtaining the geometric model. Then the model was imported into meshing software for CFD meshing, and finally the meshed file was imported into the CFD module of ABAQUS (ABAQUS/CFD) for multi-cycle transient simulation. Results The hemodynamic parameters of the aorta at different times of the cardiac cycle were obtained through simulation calculation. Conclusion Hemodynamic parameters are closely related to boundary conditions. The complex flow field environment in the aorta is related to cardiovascular diseases. Numerical simulation can provide some references for the prediction of disease development after ascending aorta replacement.