The results of computational simulations may supplement MR and other in vivo diagnostic techniques to provide an accurate picture of the hemodynamics in particular vessels, which may help demonstrate the risks of embolism or plaque rupture posed by particular plaque deposits. In this study, a model based on an endarterectomy specimen of the plaque in a carotid bifurcation was examined. The flow conditions include steady flow at Reynolds numbers of 300, 600, and 900 as well as unsteady, pulsatile flow. Both dynamic pressure and wall shear stress are very high, with shear values up to proximal to the stenosis throat in the internal carotid artery, and both vary significantly through the flow cycle. The wall shear stress gradient is also strong along the throat. Vortex shedding is observed downstream of the most severe occlusion. Two turbulence models, the Chien and Goldberg varieties of are tested and evaluated for their relevance in this geometry. The Chien model better captures phenomena such as vortex shedding. The flow distal to stenosis is likely transitional, so a model that captures both laminar and turbulent behavior is needed.
Numerical Analysis of Flow Through a Severely Stenotic Carotid Artery Bifurcation
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division October 28, 1999; revised manuscript received September 17, 2001. Associate Editor: J. E. Moore, Jr.
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Stroud , J. S., Berger, S. A., and Saloner, D. (September 17, 2001). "Numerical Analysis of Flow Through a Severely Stenotic Carotid Artery Bifurcation ." ASME. J Biomech Eng. February 2002; 124(1): 9–20. https://doi.org/10.1115/1.1427042
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