Impedance boundary condition analysis of aging-induced wave reflections in blood flow

Modeling circulatory system can help the diagnosis of vessels and predict future risk of diseases. However, the complicated geometry, elasticity of blood vessel, and pulsatile flow of blood put the accurate circulatory system modeling in a challenging task. Various modeling methods are developed to improve its accuracy. LBM solver can easily convert medical image data into lattice grid coordinates. Non-Newtonian model considers viscoelasticity of blood. Also, wall boundary treatment using ghost nodes improves the accuracy of fluid modeling. Finally, impedance boundary condition can successfully develop the effect of wave reflection at the outlet of computational domain. These efficient modeling techniques are not yet well combined each other. The purpose of this paper is to apply these methods in the circulatory system modeling to observe the relationship between vessel elasticity and blood flow wave reflection. Flow rate differences and shear stresses are analyzed by reflecting various vessel ages.