A lattice boltzmann simulation of hemodynamics in a patient-specific aortic coarctation model

A lattice boltzmann simulation of hemodynamics in a patient-specific aortic coarctation model

Randles AP, Bacher M, Pfister H, and Kaxiras E.

(Springer-Verlag: Proceedings of the Third International Conference on Statistical Atlases and Computational Models of the Heart: Imaging and Modelling Challenges, 2012.)

In this paper, we propose a system to determine the pressure gradient at rest in the aorta. We developed a technique to efficiently initialize a regular simulation grid from a patient-specific aortic triangulated model. On this grid we employ the lattice Boltzmann method to resolve the characteristic fluid flow through the vessel. The inflow rates, as measured physiologically, are imposed providing accurate pulsatile flow. The simulation required a resolution of at least 20 microns to ensure a convergence of the pressure calculation. HARVEY, a large-scale parallel code, was run on the IBM Blue Gene/Q supercomputer to model the flow at this high resolution. We analyze and evaluate the strengths and weaknesses of our system.