Aneurysmal haemodynamics: A three-dimensional fluid-structure interaction approach

In numerical studies of blood flow in aneurysms, it is essential to
consider movements of the arterial wall and their interactions with the
fluid. Here, mechanics equations are augmented to an Euler--Lagrange
formulation, facilitating the study of blood flow in a pathological
geometry during the cardiac cycle. The arterial morphology and pulse are
represented by the transformation of the system of equations into a
body-fitted approach via generalized curvilinear coordinates. Dynamic
three-dimensional governing partial differential equations are discretized
with the finite volume method on a collocated grid. The results obtained
with this mathematical model reveal that the pulsating wall influences the
velocity field, with prominent recirculation zones. In addition, localised
lateral pressure gradients are observed within the pathological region.
Increased pulsatility causes large augmentations of the Reynolds and
Womersley numbers, with divergence from the hydrodynamic case. Analysis of
biomedical factors such as the time-averaged wall shear stress and
oscillatory shear index on the oscillating boundary provides valuable
insight into the shear forces on the arterial wall compared to rigid wall
dynamics. These findings underscore the need to model fluid--structure
interactions in the context of aneurysm progression and cardiovascular
risk assessment and to consider these interactions in patient-based
biomedical approaches. The data is a supplementary part of the paper
"Aneurysmal Haemodynamics: A Three-Dimensional Fluid--Structure
Interaction Approach", Royal Society Open Science. The data contain
the velocity and pressure profiles of the simulated cases in the paper -
heamodynamic and Fluid--Structure interaction cases. Additionally, contain
the TAWSS and OSI indices data from the same simulations. We include a
script for visualizations of these data in each folder. For more
details, please read the README file.