Fluid Structural Analysis of Human Cerebral Aneurysm Using Their Own Wall Mechanical Properties

Abstract

Computational Structural Dynamics (CSD) simulations, Computational Fluid Dynamics (CFD) simulation, and Fluid Structure Interaction (FSI) simulations were carried out in an anatomically realistic model of a saccular cerebral aneurysm with the objective of quantifying the effects of type of simulation on principal fluid and solid mechanics results. Eight CSD simulations, one CFD simulation, and four FSI simulations were made. The results allowed the study of the influence of the type of material elements in the solid, the aneurism's wall thickness, and the type of simulation on the modeling of a human cerebral aneurysm. The simulations use their own wall mechanical properties of the aneurysm. The more complex simulation was the FSI simulation completely coupled with hyperelastic Mooney-Rivlin material, normal internal pressure, and normal variable thickness. The FSI simulation coupled in one direction using hyperelastic Mooney-Rivlin material, normal internal pressure, and normal variable thickness is the one that presents the most similar results with respect to the more complex FSI simulation, requiring one-fourth of the calculation time.

Fluid–structure interaction simulations outperform computational fluid dynamics in the description of thoracic aorta haemodynamics and in the differentiation of progressive dilation in Marfan syndrome patients

“…open sci. 7: 191752 Few FSI studies have been performed on anatomically realistic aneurysms models to date [28][29][30]. Torii et al investigated FSI in two cerebral aneurysms showing that wall deformation affects the distribution of WSS.…”

Numerical Simulation of Turbulent Blood Flow in the System of Coronary Arteries with Stenosis

“…where   , , , , The ALE technique is employed for the solution of the weak formula (18)(19)(20)(21)(22) which are constructed on the Lagrangian frame, but are solved on the Eulerian frame or spatially fixed system. Thus, computation is conducted by a transformation between two coordinate systems.…”

Effects of aspect ratio, wall thickness and hypertension in the patient-specific computational modeling of cerebral aneurysms using fluid-structure interaction analysis

“…Larger displacement at the dome region, lower WSS and a higher wall stress are observed in the pre-rupture state. However, the effects of AR increase and t w reduction due to aneurysm growth have not been incorporated in all these previous studies (Ahmed et al, 2011;Lee et al, 2013;Sanchez et al, 2013;Torii et al, 2011;Valencia et al, 2013;Valencia & Torres, 2017).…”