Large eddy simulations of blood dynamics in abdominal aortic aneurysms

Christian Vergara, Davide Le Van, Maurizio Quadrio, Luca Formaggia, Maurizio Domanin

Research output: Contribution to journalArticle

Abstract

We study the effects of transition to turbulence in abdominal aortic aneurysms (AAA). The presence of transitional effects in such districts is related to the heart pulsatility and the sudden change of diameter of the vessels, and has been recorded by means of clinical measures as well as of computational studies. Here we propose, for the first time, the use of a large eddy simulation (LES) model to accurately describe transition to turbulence in realistic scenarios of AAA obtained from radiological images. To this aim, we post-process the obtained numerical solutions to assess significant quantities, such as the ensemble-averaged velocity and wall shear stress, the standard deviation of the fluctuating velocity field, and vortical structures educed via the so-called Q-criterion. The results demonstrate the suitability of the considered LES model and show the presence of significant transitional effects around the impingement region during the mid-deceleration phase.

Original languageEnglish
Pages (from-to)38-46
JournalMedical Engineering and Physics
Volume47
DOIs
Publication statusPublished - 2017

Keywords

  • Abdominal aortic aneurysm
  • Ensemble-average
  • Large eddy simulation
  • Transition to turbulence

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering

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