id: Simula.simula.406
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title: Simulation Methodology for Cerebral Blood Flow
publication_year: 2011
abstract: In experiments turbulence has previously been  shown to occur in intracranial aneurysms, but the turbulent effects on the arterial  wall have not been investigated. The effects of  turbulence induced oscillatory wall stresses could be of great importance in understanding aneurysm rupture due to the local arterial wall  response to such hemodynamical forces. To investigate the effects of turbulence on  blood flow in an intracranial aneurysm, we performed a high resolution computational fluid dynamics (CFD)  simulations in a patient specific middle cerebral artery (MCA) aneurysm using a realistic, pulsatile inflow velocity. The flow showed transition to turbulence just after peak systole, and the turbulent fluctuations increased in  intensity until mid deceleration, before relaminarization occurred during diastole. The flow impinged with an angle nearly normal onto the aneurysm dome, and the  turbulence structures greatly affected both the frequency of change of  wall shear stress (WSS) direction and WSS magnitude, which reached a maximum value of 41.5 Pa. The recorded frequencies were predominantly in the range of 1-500 Hz. The current study confirms, through properly resolved CFD simulations, that turbulence can occur in intracranial aneurysms. Because of the local arterial wall response to hemodynamical forces,  the effects of oscillatory  WSS caused by turbulence,  could be correlated with aneurysm rupture, and should be investigated experimentally.
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howpublished: Biomedical Simulation Lab, Institute of Biomaterials and Biomedical Engineering at the University of Toronto 
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publication_month: March
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publication_state: Published
simula_ou: [<Department at /simula/department/biocomp>]
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misc_type: MiscReference