Numerical simulation of fluid-induced vibration and wall shear stress in fusiform cerebral aneurysm

Newtonian and non-newtonian fluid

Hyun Kim Yong, Joon Sang Lee, Wu Xin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Vascular techniques have been used for curing the aneurysm, but the reason for the occurrence of aneurysms can not be known using these techniques. These techniques are usually used for preventing a significant situation such as rupture of an aneurysm. In our study, blood flow effects with or without vascular techniques inside an aneurysm were analyzed with computational fluid dynamics (CFD). Important hemodynamic quantities like wall shear stress and pressure in vessel are difficult to measure in-vivo. Blood flow is assumed to be Newtonian fluid. But it actually consists of platelets, so it is also considered a non-Newtonian fluid in this study. Results of the numerical model were used to compare and analyze fluid characteristics with experimental data. Using the flow characteristics (wall shear stress (WSS), wall shear stress gradient (WSSG)), the rupture area was identified to be located in the distal area. However, the rupture area, in vivo studies, was observed to be present at a different location. During pulsatile flow, vibration induced by flow is implicated by weakening of the artery wall and affects more than shear stress. After adapting the fluid-induced vibration, the rupture area in aneurysm is found to be located in the same area as the in-vivo result. Since smaller inflow and low WSS provide the effect of the distal neck, the vibration provides more effects in dome area. In this study it has been found that the effect of shear stress on the rupture of aneurysm is less than the effect of vibration. In the case of non-Newtonian fluid, vibration induced by flow also has more effects than WSS and WSSG. The simulation results gave detailed information about hemodynamics under physiological pulsatile inlet condition.

Original languageEnglish
Title of host publicationProceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)0791837904, 9780791837900
Publication statusPublished - 2006 Jan 1
Event2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Chicago, IL, United States
Duration: 2006 Nov 52006 Nov 10

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
ISSN (Print)0888-8116

Other

Other2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
CountryUnited States
CityChicago, IL
Period06/11/506/11/10

Fingerprint

Shear stress
Fluids
Computer simulation
Hemodynamics
Blood
Pulsatile flow
Shear walls
Domes
Platelets
Curing
Numerical models
Computational fluid dynamics

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Yong, H. K., Lee, J. S., & Xin, W. (2006). Numerical simulation of fluid-induced vibration and wall shear stress in fusiform cerebral aneurysm: Newtonian and non-newtonian fluid. In Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED). American Society of Mechanical Engineers (ASME).
Yong, Hyun Kim ; Lee, Joon Sang ; Xin, Wu. / Numerical simulation of fluid-induced vibration and wall shear stress in fusiform cerebral aneurysm : Newtonian and non-newtonian fluid. Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division. American Society of Mechanical Engineers (ASME), 2006. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED).
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abstract = "Vascular techniques have been used for curing the aneurysm, but the reason for the occurrence of aneurysms can not be known using these techniques. These techniques are usually used for preventing a significant situation such as rupture of an aneurysm. In our study, blood flow effects with or without vascular techniques inside an aneurysm were analyzed with computational fluid dynamics (CFD). Important hemodynamic quantities like wall shear stress and pressure in vessel are difficult to measure in-vivo. Blood flow is assumed to be Newtonian fluid. But it actually consists of platelets, so it is also considered a non-Newtonian fluid in this study. Results of the numerical model were used to compare and analyze fluid characteristics with experimental data. Using the flow characteristics (wall shear stress (WSS), wall shear stress gradient (WSSG)), the rupture area was identified to be located in the distal area. However, the rupture area, in vivo studies, was observed to be present at a different location. During pulsatile flow, vibration induced by flow is implicated by weakening of the artery wall and affects more than shear stress. After adapting the fluid-induced vibration, the rupture area in aneurysm is found to be located in the same area as the in-vivo result. Since smaller inflow and low WSS provide the effect of the distal neck, the vibration provides more effects in dome area. In this study it has been found that the effect of shear stress on the rupture of aneurysm is less than the effect of vibration. In the case of non-Newtonian fluid, vibration induced by flow also has more effects than WSS and WSSG. The simulation results gave detailed information about hemodynamics under physiological pulsatile inlet condition.",
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Yong, HK, Lee, JS & Xin, W 2006, Numerical simulation of fluid-induced vibration and wall shear stress in fusiform cerebral aneurysm: Newtonian and non-newtonian fluid. in Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, American Society of Mechanical Engineers (ASME), 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006, Chicago, IL, United States, 06/11/5.

Numerical simulation of fluid-induced vibration and wall shear stress in fusiform cerebral aneurysm : Newtonian and non-newtonian fluid. / Yong, Hyun Kim; Lee, Joon Sang; Xin, Wu.

Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division. American Society of Mechanical Engineers (ASME), 2006. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Vascular techniques have been used for curing the aneurysm, but the reason for the occurrence of aneurysms can not be known using these techniques. These techniques are usually used for preventing a significant situation such as rupture of an aneurysm. In our study, blood flow effects with or without vascular techniques inside an aneurysm were analyzed with computational fluid dynamics (CFD). Important hemodynamic quantities like wall shear stress and pressure in vessel are difficult to measure in-vivo. Blood flow is assumed to be Newtonian fluid. But it actually consists of platelets, so it is also considered a non-Newtonian fluid in this study. Results of the numerical model were used to compare and analyze fluid characteristics with experimental data. Using the flow characteristics (wall shear stress (WSS), wall shear stress gradient (WSSG)), the rupture area was identified to be located in the distal area. However, the rupture area, in vivo studies, was observed to be present at a different location. During pulsatile flow, vibration induced by flow is implicated by weakening of the artery wall and affects more than shear stress. After adapting the fluid-induced vibration, the rupture area in aneurysm is found to be located in the same area as the in-vivo result. Since smaller inflow and low WSS provide the effect of the distal neck, the vibration provides more effects in dome area. In this study it has been found that the effect of shear stress on the rupture of aneurysm is less than the effect of vibration. In the case of non-Newtonian fluid, vibration induced by flow also has more effects than WSS and WSSG. The simulation results gave detailed information about hemodynamics under physiological pulsatile inlet condition.

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Yong HK, Lee JS, Xin W. Numerical simulation of fluid-induced vibration and wall shear stress in fusiform cerebral aneurysm: Newtonian and non-newtonian fluid. In Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division. American Society of Mechanical Engineers (ASME). 2006. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED).