High-resolution numerical simulations are carried out to systematically investigate the effect of the incoming flow waveform on the hemodynamics and wall shear stress patterns of an anatomic sidewall intracranial aneurysm model. Various wave forms are constructed by appropriately scaling a typical human waveform such that the waveform maximum and time-averaged Reynolds numbers, the Womersley number , and the pulsatility index (PI) are systematically varied within the human physiologic range. We show that the waveform PI is the key parameter that governs the vortex dynamics across the aneurysm neck and the flow patterns within the dome. At low PI, the flow in the dome is similar to a driven cavity flow and is characterized by a quasi-stationary shear layer that delineates the parent artery flow from the recirculating flow within the dome. At high PI, on the other hand, the flow is dominated by vortex ring formation, transport across the neck, and impingement and breakdown at the distal wall of the aneurysm dome. We further show that the spatial and temporal characteristics of the wall shear stress field on the aneurysm dome are strongly correlated with the vortex dynamics across the neck. We finally argue that the ratio between the characteristic time scale of transport by the mean flow across the neck and the time scale of vortex ring formation can be used to predict for a given sidewall aneurysm model the critical value of the waveform PI for which the hemodynamics will transition from the cavity mode to the vortex ring mode.
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November 2010
Research Papers
Pulsatile Flow Effects on the Hemodynamics of Intracranial Aneurysms
Trung B. Le,
Trung B. Le
Department of Civil Engineering, Saint Anthony Falls Laboratory,
University of Minnesota
, 2 Third Avenue South East, Minneapolis, MN 55414
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Iman Borazjani,
Iman Borazjani
Department of Civil Engineering, Saint Anthony Falls Laboratory,
University of Minnesota
, 2 Third Avenue South East, Minneapolis, MN 55414
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Fotis Sotiropoulos
Fotis Sotiropoulos
Department of Civil Engineering, Saint Anthony Falls Laboratory,
e-mail: fotis@umn.edu
University of Minnesota
, 2 Third Avenue South East, Minneapolis, MN 55414
Search for other works by this author on:
Trung B. Le
Department of Civil Engineering, Saint Anthony Falls Laboratory,
University of Minnesota
, 2 Third Avenue South East, Minneapolis, MN 55414
Iman Borazjani
Department of Civil Engineering, Saint Anthony Falls Laboratory,
University of Minnesota
, 2 Third Avenue South East, Minneapolis, MN 55414
Fotis Sotiropoulos
Department of Civil Engineering, Saint Anthony Falls Laboratory,
University of Minnesota
, 2 Third Avenue South East, Minneapolis, MN 55414e-mail: fotis@umn.edu
J Biomech Eng. Nov 2010, 132(11): 111009 (11 pages)
Published Online: October 27, 2010
Article history
Received:
August 14, 2010
Revised:
September 17, 2010
Posted:
October 4, 2010
Published:
October 27, 2010
Online:
October 27, 2010
Citation
Le, T. B., Borazjani, I., and Sotiropoulos, F. (October 27, 2010). "Pulsatile Flow Effects on the Hemodynamics of Intracranial Aneurysms." ASME. J Biomech Eng. November 2010; 132(11): 111009. https://doi.org/10.1115/1.4002702
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