Numerical Simulation for Blood Flow - Microsurgery: Advances, Simulations, and Applications - page 198

at the cross section is shown in Figure (5.23) and the maximum
velocity magnitude reaches 0.30 m/s. As is the case with wall shear
stress distribution, three phases of pulsed wave are shown in Figs.
5.23(a-c). The common characteristic in three phases, the velocity
magnitude of the internal vessel, is higher than that of the outer
vessel. Additionally, at the peak systole, the difference of velocity
between the inside and outside of the vessel becomes clear. At the
diastole phase ( t = 0.50 s), vortex structure appears outside of the
vessel and the velocity decreases nearly to 0 m/s.
Figure 5.23 Velocity. See also Color Insert.
5.4.8 Streamline
Figure 5.24 shows the streamline between three calculation states.
Blood low from inlet impact at the bifurcation and divides into two
branches, and the velocity of the narrow branch is faster than that of
the larger branch. In the irst state shown in Fig. 5.24(a) ( t = 0.1 s),
the streamline describes the lines along with the shape of the vessel
wall and the velocity of blood low decreases at the larger branch.
Vortex low appears at systole phase shown in Fig. 5.24(b) ( t = 0.25
s) after inlet low impacts the bifurcation. The velocity of blood low
is the maximum in this phase and more than 3.0 m/s. In the next
phase shown in Fig. 5.24(c), vortex low maintains its structure and
the velocity is slowed down.