Coupled Simulation of Hemodynamics and Vascular Growth and Remodeling in a Subject-Specific Geometry
A computational framework to couple vascular growth and remodeling (G&R) with blood flow simulation in a 3D patient-specific geometry is presented. Hyperelastic and anisotropic properties are considered for the vessel wall material and a constrained mixture model is used to represent multiple constituents in the vessel wall, which was modeled as a membrane. The coupled simulation is divided into two time scales—a longer time scale for G&R and a shorter time scale for fluid dynamics simulation. G&R is simulated to evolve the boundary of the fluid domain, and fluid simulation is in turn used to generate wall shear stress and transmural pressure data that regulates G&R. To minimize required computation cost, the fluid dynamics are only simulated when G&R causes significant vascular geometric change. For demonstration, this coupled model was used to study the influence of stress-mediated growth parameters, and blood flow mechanics, on the behavior of the vascular tissue growth in a model of the infrarenal aorta derived from medical image data.
KeywordsAneurysm Blood flow Constrained mixture Coupled simulation Growth and remodeling
We would like to thank Dr. Seungik Baek for helpful discussions during the development of this work. This work was supported in part by National Heart, Lung, and Blood Institute Grant 5R21-HL-108272.
Conflict of interest
The authors do not have conflicts of interest relevant to this manuscript.
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