Affiliations: [a] Graduate School of Engineering, Chiba University, Chiba, Japan | [b] Institute of Fluid Science, Tohoku University, Miyagi, Japan | [c] Graduate School of Engineering, Chiba University, Chiba, Japan
Correspondence:
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Corresponding author: Ryuhei Yamaguchi, Graduate School of Engineering, Chiba University 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. Tel.: +81 43 251 1111 ext.4538; Fax: +81 43 290 3335; E-mail:yryuhei63@gmail.com
Abstract: BACKGROUND: Many numerical studies have been published with respect
to about flow structures around cerebral aneurysm assuming to be rigid.
Furthermore, there is little experimental research concerning aneurysm with
elastic wall. Wall shear stress in elastic wall comparing with rigid wall
should be clarified in experimental approach and verified in CFD. OBJECTIVE: We have experimentally realized elastic aneurysm model
accompanying with wall deformation. Wall shear stress was examined for both
rigid and elastic aneurysm models in pulsatile flow. METHODS: Effect of elasticity on wall shear stress inside aneurysm
induced at the apex of anterior cerebral artery was experimentally examined
by particle image velocimetry in vitro. In order to adjust the wall deformation, the pressure adjustment chamber was specially equipped outside the aneurysm wall. RESULTS: Effect of elasticity on wall shear stress was noticed on
the comparison with that of rigidity. Wall elasticity reduced the peak
magnitude, the spatial and temporal averaged wall shear stress comparing
with those of wall rigidity experimentally. These reductions were endorsed
by fluid-structure interaction simulation. CONCLUSION: Elastic wall comparing with rigid wall would reduce
the peak magnitude, the spatial and temporal averaged wall shear stress
acting on vascular wall.
