Biomedical Engineering Reference
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Fig. 8.56
Vortex swirling
strength comparison: (
a
)
CFD simulation using rigid
wall assumption, (
b
) FSI
simulation using compliant
wall assumption
the FSI simulation, which means the interaction between the main stream and intra-
aneurysmal flow were intensified compared with the rigid wall simulation. This
finding also agrees with the velocity comparison as depicted by Fig.
8.55
.
A widely accepted criterion for arterial wall remodelling from exposure to fluid
flow is its wall shear stress being lower than 0.4 Pa. Figure
8.57
compares the low
wall shear stress regions for the CFD and FSI simulations. Anteriorly, the CFD
approach predicts a larger low WSS region covering almost the whole aneurysm.
The FSI simulation predicts a much smaller low WSS region only covering the up-
per half of the aneurysm. Posteriorly, the CFD simulation does not produce any low
Fig. 8.57
Wall shear stress distribution (
a
) CFD simulation using rigid wall assumption, (
b
) FSI
simulation using compliant wall assumption
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