Biomedical Engineering Reference
In-Depth Information
Longitudinal Velocity [mm.s-1]
0
Pareto front
−
5
−
10
15
−
−
20
−
25
−
30
−
35
−
40
−
45
−
50
0.045
0.05
0.055
0.06
0.065
0.07
Pressure variation [10
4
Pa]
Fig. 6
Maximum pressure variation and longitudinal velocities for critical domain
Velocity distribution [mm s
1
] for the optimal shape
Fig. 7
along bypass and host artery can be analysed in three parts. In the first part the
flow is still undisturbed and therefore the velocity is quite uniform. In the second
part the flow is within the graft area where the velocity raises as the flow moves
along the graft. In the third part the flow is sufficiently far from the graft and
therefore it exhibits a uniform distribution. At the exit of the graft after the artery-
graft junction, the velocity values variation is rather smooth. It is interesting to
notice that although the abrupt connection between artery and graft induces large
velocity variations, the observable reverse flow is quite small. Long residence times
usually observable immediately after the toe of the distal anastomosis are quite
undetectable.
