Biomedical Engineering Reference
In-Depth Information
Fig. 8.16
Time averaged
velocity comparison (
a
)
simulation based on rigid
wall approach (
CFD-only
),
(
b
) simulation based on the
compliant wall approach (
FSI
approach
)
Fig. 8.17
Plane velocity
comparison at the peak sys-
tole (
a
) velocity distribution
based on rigid wall approach,
(
b
) velocity distribution
based on the compliant wall
approach
Figure
8.17
depicts the velocity at one selected cross-section within the carotid
bifurcation region at peak systole. Its area increases from 42.72 mm
2
to 59.49 mm
2
,
when switching from the CFD modelling approach to a fully coupled FSI model-
ling approach. The FSI simulation contributes an area expansion of 39.3 % at this
location, and this expansion significantly mitigates the peak velocity from 0.8 m/s
to less than 0.6 m/s. Due to the increased flow resistance of the ICA branch in the
CFD-model, more blood flow occurs in the ECA branch, leaving a relatively large
area of low velocity at the near wall region in front of the ICA branch. The low ve-
locity region for the FSI simulation is considerably reduced since the downstream
flow resistance is not as great as the CFD simulation, and the blood flow is distrib-
uted more evenly.
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