Pumps for Human Blood Pressure Simulation - Microsurgery: Advances, Simulations, and Applications - page 218

5 mm and the aspect ratio 1.6 (Fig. 6.14). As the next step in the
design process, computer luids dynamics (CFD) was used for the
simulation of the shear stress in the saccular designed aneurysm to
ind the minimum of shear stress in the aneurysm dome and locate
the bleb model. The simulated luid has a sine wave shape with
frequency of 1 Hz, with Reynolds number in the range of 200-900
and a viscosity of 3.91 mPa ⋅ s -1 . Figure 6.15 shows the CFD result
for wall shear stress variation during one period of the sine wave.
Wall shear stress is higher in neck area and the dome side where the
low enters the aneurysm. From this image, the location of the bleb
model was selected as depicted in Fig. 6.16(a). Following that design,
a multilayer model of the aneurysm with bleb was constructed, for
enabling plastic deformation of the model wall with inner pressure
the silicone layers shielding was not present in a perimeter of about
1 mm over the aneurysm model surface. The multilayer model is
shown in Fig. 6.16(b).

t=0s t=0.25s t=0.50s

Wall Shear Stress

0.5

0.25

[Pa]

0

t=0.75s t=1.0s

Figure 6.15 Wall shear stress analysis time line for the 1 Hz sine wave luid
inside the designed saccular aneurysm.

Figure 6.16 (a) Bleb location within the saccular aneurysm. (b) Multilayer
model of saccular aneurysm with bleb.