Title: Investigation using a one-way coupled FE-structural and FV-hemodynamic simulation for identifying the factors causing the progression of a saccular aneurysm model

Authors: Suraj Raj; Anil Lal Sadasivan; Anjan R. Nair

Addresses: Department of Mechanical Engineering, College of Engineering Trivandrum, Trivandrum – 695017, Kerala, India; Affiliated to: APJ Abdul Kalam Technological University, India ' Department of Mechanical Engineering, National Institute of Technology Sikkim, Sikkim – 737139, India ' Department of Mechanical Engineering, Government Engineering College Thrissur, Thrissur – 680009, Kerala, India

Abstract: Rupture risk assessment of cerebral aneurysms through computational modelling has gained importance due to the absence of objective clinical methods and challenges in experimental approaches. This study uses a one-way FSI approach with a non-Newtonian Carreau viscosity model on an idealised 3D saccular aneurysm in a curved artery to analyse key hemodynamic and structural parameters. Velocity magnitude, time-averaged wall shear stress (TAWSS), oscillatory shear index (OSI), vorticity magnitude, von-Mises stress, and total displacement were evaluated across the cardiac cycle. A low-velocity stagnation zone was observed within the aneurysm sac. TAWSS was lower inside the sac but peaked near the distal end, where OSI values exceeded 0.2, reaching up to 0.45, indicating vulnerable regions. Vorticity and q-criterion analyses highlighted disturbed, vorticity-dominated flow regions. Maximum von-Mises stress and displacement were observed near the distal regions, suggesting that shape distortions contribute significantly to aneurysm progression and rupture risk.

Keywords: cerebral aneurysm; rupture risk assessment; computational modelling; fluid-structure interaction; FSI; non-Newtonian Carreau model; wall shear stress; WSS; oscillatory shear index; OSI; vorticity magnitude; von-Mises stress; aneurysm progression.

DOI: 10.1504/PCFD.2026.154626

Progress in Computational Fluid Dynamics, An International Journal, 2026 Vol.26 No.4, pp.250 - 262

Received: 28 Apr 2025
Accepted: 27 Aug 2025
Published online: 08 Jul 2026 *

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