Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Using foam-extend to Assess the Influence of Fluid-solid Interaction on the Flow in Intracranial Aneurysms
Submission Author:
Iago Lessa Oliveira , SP , Canada
Co-Authors:
José Luiz Gasche, Julio Militzer, Carlos Baccin , Iago Lessa Oliveira
Presenter: Iago Lessa Oliveira
doi://10.26678/ABCM.COBEM2017.COB17-0851
Abstract
Aneurysms are abnormalities formed in some regions of the human vascular system and are characterized by dilated and thin regions of the arterial wall. One of the most common types occurs inside the brain arteries in the circle of Willis. These intracranial aneurysms are extremely dangerous because in case of rupture they can cause sub-arachnoid hemorrhage, with consequent death or presence of permanent damage to the patient. Causes of aneurysms have been investigated for a long time, and researchers agree that hemodynamic effects play a key role in the rupture of brain aneurysms. With the development of scanning techniques of the cerebral vascular system, it has been possible to obtain the geometry of aneurysms allowing numerical methods for the solution of blood flow to be used. Since then, several researchers have been investigating the influence of biological and hemodynamic variables on aneurysms rupture considering arteries and aneurysms as rigid walls. It has been only in the last decade that few works started investigating the influence of flexible walls – that is, including the fluid-structure interaction problem – on those variables. In this work we simulated the blood flow in patient-specific aneurysm geometries using the open-source library foam-extend-4.0 to numerically solve the fluid-structure interaction problem. By comparing the flow parameters – wall shear stress and flow impingement on the aneurysm wall – between the results of the simulations considering rigid and flexible walls hypotheses, we evaluated the influence of wall flexibility on such parameters, concluding that the flexibility of the walls influences the flow parameters that can lead to rupture.
Keywords
Intracranial aneurysms, Numerical simulation, fluid-structure interaction (FSI), foam-extend
