NUMERICAL INVESTIGATION OF BLOOD FLOW FEATURES IN INTRACRANIAL SACCULAR ANEURYSMS

Year 2018, Special Issue 7: International Conference on Energy and Thermal Engineering Istanbul 2017 (ICTE 2017), 1867 - 1878, 20.12.2017

Hatice Mercan

https://doi.org/10.18186/journal-of-thermal-engineering.383147

Cited By: 3

Abstract

This study aims to provide
insight about how the hemodynamic factors change with artery curvature for a
developing aneurysm during a cardiac cycle. The aneurysm is investigated in
terms of the vortical structure and the shear stress along the curved artery
wall for three developing stages (initial, intermediate and terminal stages),
for three instances of a cardiac cycle (diastole end, systole peak and diastole
start) and for three different vascular geometries. The stream function
vorticity formulation is used with Newtonian constitutive relation. During the
systole peak instance for all aneurysm stages, the central vortex squeezes the
streamlines towards the distal neck of the aneurysm leading to maximum wall
shear stress in the vicinity of the distal wall of the aneurysm. The radius of
curvature of the artery and inertial forces increased the wall shear stress
along the aneurysm wall. The wall shear stress changes direction and
concentrates in the vicinity of the distal neck for all artery geometries. Secondary
vortices are observed in the terminal stage during diastole end and diastole
start instances for the straight arteries and lead to shear stress fluctuations
along the wall. The observations of this study are discussed together with the
relevant clinical and numerical literature.

Keywords

Hemodynamics, Intracranial Aneurysm, Pulsatile Flow, Stream Function-Vorticity Formulation, Computational Fluid Dynamics, Wall Shear Stress Analysis

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