The influence of the instabilities in modelling arteriovenous junction haemodynamics

Stephen P. Broderick, J. Graeme Houston, Michael T. Walsh (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The arteriovenous junction is characterised by high flow rates, large pressure difference and typically a palpable thrill or audible bruit, associated with turbulent flow. However, the arteriovenous junction is frequently studied with the assumption of streamline flow. This assumption is based on the Reynolds number calculation, although other factors can contribute to turbulent generation. In this study, the presence of instabilities is examined and the influencing factors discussed. This was performed using a pseudo-realistic geometry with adapted graft angles, vein diameter, outflow split ratio and graft inlet velocity values. Correlation was performed between steady and unsteady averaged simulation cases with correlation performance ranked. Overall the arteriovenous junction is capable of possessing highly disturbed flows, in which strict modelling requirements are necessary to capture such instabilities and avoid erroneous conclusions. Vein diameter and flow split ratio contribute to turbulent generation, thus Reynolds number cannot be used as a sole turbulent criterion in the arteriovenous junction.

Original languageEnglish
Pages (from-to)3591-3598
Number of pages8
JournalJournal of Biomechanics
Volume48
Issue number13
Early online date12 Aug 2015
DOIs
Publication statusPublished - 15 Oct 2015

Keywords

  • Arteriovenous junction
  • Computational fluid dynamics
  • Instabilities
  • Large eddy simulation
  • Turbulence
  • Wall shear stress

Fingerprint Dive into the research topics of 'The influence of the instabilities in modelling arteriovenous junction haemodynamics'. Together they form a unique fingerprint.

Cite this