Analyzing transient turbulence in a stenosed carotid artery by proper orthogonal decomposition

Leopold Grinberg, Alexander Yakhot, George Em Karniadakis

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

High-resolution three-dimensional simulations (involving 100 million degrees of freedom) were employed to study transient turbulent flow in a carotid arterial bifurcation with a stenosed internal carotid artery (ICA). The geometrical model was reconstructed from MRI images, and in vivo velocity measurements were incorporated in the simulations to provide inlet and outlet boundary conditions. Due to the high degree of the ICA occlusion and the variable flow rate, a transitional and intermittent flow between laminar and turbulent states was established. Time- and space-window proper orthogonal decomposition (POD) was applied to quantify the different flow regimes in the occluded artery. A simplified version of the POD analysis that utilizes 2D slices only-more appropriate in the clinical setting-was also investigated.

Original languageEnglish
Pages (from-to)2200-2217
Number of pages18
JournalAnnals of Biomedical Engineering
Volume37
Issue number11
DOIs
StatePublished - 1 Nov 2009

Keywords

  • CFD
  • Transitional flow
  • Windowed-POD

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