Effect of geometry of stenosis on the computation of flow characteristics of unsteady blood flow in a collapsible vessel

Aik Ying Tang, Mohd Al Akhbar Mohd Noor, Airil Yasreen Mohd Yassin, Norsarahaida Saidina Amin, Mohd Zhafri Jamil Abd Nazir

Research output: Contribution to journalArticlepeer-review

Abstract

This paper discusses the effect of different geometric representations of stenosis on the numerical solution of one-dimensional unsteady blood flow in stenotic blood vessel (or stenosis) taking into account fluid-structure interaction. In the formulation, a collapsible pressure-area constitutive relation is added to the coupled mass and momentum equations to allow for the interaction between the cross sectional area, volumetric flow rate and pressure of the flow and hence the prevalence of the one-dimensional fluid-structure interaction. The formulation is stabilized by employing Streamline-Upwind Petrov-Galerkin scheme. Non-reflecting boundary conditions are imposed based on the method of characteristics. Flow characteristics and the geometrical effects of the stenosis are then discussed. Numerical results show that stenosis with irregular shape is more prone to collapse as compared to the smooth one for a given baseline conditions. This study, thus, highlights the importance of representing the shape of the stenosis as close as possible as it might give information otherwise missing in the simplistic smooth representation of the stenosis.

Original languageEnglish
Pages (from-to)15-25
Number of pages11
JournalJurnal Teknologi
Volume83
Issue number2
Early online date2 Feb 2021
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Blood flow
  • Fluid-structure interaction
  • Stenosis
  • Streamline-upwind Petrov-Galerkin
  • Vessel collapse

ASJC Scopus subject areas

  • Engineering(all)

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