Lattice Boltzmann Model of 3D Multiphase Flow in Artery Bifurcation Aneurysm Problem

Area of Science:

• Computational fluid dynamics (CFD)
• Biomedical engineering
• Medical imaging analysis

Background:

• Assessing blood flow hemodynamics in 3D aneurysms is challenging with standard imaging like MRI.
• Accurate simulation of complex blood flow is crucial for understanding aneurysm progression.

Purpose of the Study:

• To simulate and predict laminar blood flow within a 3D aneurysm geometry.
• To compare the performance of different Lattice Boltzmann (LB) models against a commercial CFD solver.

Main Methods:

• Simulation of 3D aneurysm laminar flow using three Lattice Boltzmann (LB) models: single relaxation time (SRT), multiple relaxation time (MRT), and regularized BGK.
• Validation of LB model results using ANSYS FLUENT, a finite volume (FV) method CFD solver.
• Comparison of simulated flow profiles, including velocity, pressure, and wall shear stress (WSS).

Main Results:

• All LB models demonstrated good agreement with the FV solver for complex blood flow simulations.
• Minor differences were observed in wall shear stress (WSS) profiles between the solvers.
• LBM-based code exhibited superior performance in terms of computation time due to efficient parallelization.

Conclusions:

• Lattice Boltzmann methods provide a viable and efficient approach for simulating blood flow in 3D aneurysms.
• LB models offer comparable accuracy to traditional CFD solvers for hemodynamic analysis.
• The parallel implementation of LBM shows significant advantages in computational efficiency for blood flow simulations.