Abstract
This paper simulates and predicts the laminar flow inside the 3D aneurysm geometry, since the hemodynamic situation in the blood vessels is difficult to determine and visualize using standard imaging techniques, for example, magnetic resonance imaging (MRI). Three different types of Lattice Boltzmann (LB) models are computed, namely, single relaxation time (SRT), multiple relaxation time (MRT), and regularized BGK models. The results obtained using these different versions of the LB-based code will then be validated with ANSYS FLUENT, a commercially available finite volume- (FV-) based CFD solver. The simulated flow profiles that include velocity, pressure, and wall shear stress (WSS) are then compared between the two solvers. The predicted outcomes show that all the LB models are comparable and in good agreement with the FVM solver for complex blood flow simulation. The findings also show minor differences in their WSS profiles. The performance of the parallel implementation for each solver is also included and discussed in this paper. In terms of parallelization, it was shown that LBM-based code performed better in terms of the computation time required.
Highlights
Aneurysm is a condition in which a blood vessel wall is pathologically dilated
In a study by Bai-Nan et al [62] and Cebral et al [66], it was reported that the ruptured aneurysms are associated with higher wall shear stress but recent studies pointed out that the rupture point of aneurysm is induced by remarkably low shear stress [8, 67]. We found that both highest and lowest wall shear stress exist in the geometry
The Lattice Boltzmann method (LBM) for 3D transient blood flow in aneurysm geometry has been validated by comparing the simulation results with those obtained by conventional commercial FVM solver
Summary
Aneurysm is a condition in which a blood vessel wall is pathologically dilated. It normally happens at the vicinity of the circle of Willis, the main cerebral arteries, and has been found to develop in the iliac and intracranial arteries [1]. As the treatment methods for aneurysm carry a high degree of risk [2], understanding the vessel’s internal fluid flow is important. Various computational fluid dynamics (CFD) studies [4,5,6,7,8,9] have been carried out to investigate the relationship between hemodynamic factors and the risk of an artery wall’s rupture. These factors were the impingement force, the WSS, the pressure, and the blood velocity
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