Biomedical Engineering Reference
In-Depth Information
Fig. 13 Velocity magnitude (cm/s) for the geometry with side-branch and traction-free boundary
condition and the clipped geometry coupled with the 1D model and its differences, in unsteady
flow regime
These conclusions might not be straightforwardly extended to the anatomically
realistic geometries, since in such cases the side-branches are not straight tubes.
Work is ongoing in applying the approaches here presented to a significant
number of patient-specific geometries. The traction-free outflow condition on
the clipped geometry compared poorly to the solution of the tube side-branch
with a fully developed flow. The differences between steady and unsteady inflow
conditions are small and localized when the time averaged solution is compared.
However, at specific time instants of the cardiac cycle those differences are
much more significant, specially during systole. The Newtonian and Carreau
shear-thinning fluid models were used in both realistic and idealized geometries.
In both cases differences between the two rheological models are apparent, but less
emphatic than the influence of the boundary conditions. Also, the results of the WSS
and the WSSG show higher discrepancies between the two blood flow models. The
results here presented are preliminary in the sense that they should be complemented
with extensive studies in patient-specific geometries in order to obtain conclusions
in more general scenarios.
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