Investigating the effect of surface roughness modeling on hemodynamics of blood flow in thoracic aortic aneurysm

Articles in Press

Document Type : Research Paper

Authors

1 Faculty of Mechanical Engineering, Qom University of Technology, Qom, Iran

2 Department of mechanical engineering, Qom university of technology, Qom, Iran

Abstract

In recent years, numerical simulations of blood flow in arteries have effectively contributed to understanding the mechanisms of some cardiovascular diseases and selecting the appropriate treatment scenario. In this study, blood flow in a real geometry of the thoracic aortic artery of a patient with aneurysm was numerically modeled. The effect of vessel surface roughness along with flow regime and various turbulence models on wall shear stress (WSS) and hemodynamic parameters such as time average wall shear stress (TAWSS), relative residence time (RRT), and oscillatory shear index (OSI) were investigated. The simulation results show that the presence of roughness increases the area of areas with high RRT values. Also, increasing roughness reduces the area of regions with high TAWSS values. Increasing surface roughness increase the average pressure inside the vessel. In all the regimes and models studied in this article, the general pattern of TAWSS distribution is almost the same. TAWSS has low values in the aneurysm sac region. High values of OSI are observed around the aortic arch region. Considering the distribution of hemodynamic parameters, the end regions of the aneurysm sac and the inner aortic arch in the studied patient are susceptible to atherosclerosis.

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Main Subjects

Journal of Modeling in Engineering

Articles in Press, Accepted Manuscript
Available Online from 14 September 2025

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History

  • Receive Date: 10 January 2025
  • Revise Date: 26 May 2025
  • Accept Date: 08 July 2025

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