Numerical simulation of wall shear stress of physiological blood flow through stenosed arteries with varying flow spirality, stenotic severity, eccentricity and length.

摘要

A numerical simulation has been performed to investigate the effects of flow spirality and stenotic shape on wall shear stress in the three dimensional idealized stenosed arteries. Non-Newtonian flow has been taken for the simulation. The wall of the vessel is considered to be rigid. Physiological, parabolic and spiral velocity profile has been imposed for inlet boundary condition. Moreover, time dependent pressure profile has been taken for outlet boundary condition. Reynolds number at the inlet has been ranged approximately from 86 to 966 for the investigation. Low Reynolds number k-w model has been used as governing equation. The numerical results have been presented in terms of wall shear stress distributions by statistical data. The simulations and the statistical analysis have been performed by using ANSYS-18.1 and SPSS respectively. According to the statistical analysis, the models are significant and 73.7%, 21.5% and 68.8% of the variation of WSS_(max), WSS_(min) and WSS_(ave) respectively can be influenced by the stenotic shape and flow spirality. The eccentricity is the most influencing factor for WSS_(max). The flow spirality has no influence on all WSS_(max), WSS_(min) and WSS_(ave), whereas the stenotic severity has influence on them.