Numerical analysis of bypass model geometrical parameters influence on pulsatile blood flow
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Date issued
2011
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of West Bohemia
Abstract
The present study is focused on the analysis of pulsatile blood flow in complete idealized 3D bypass models in
dependence on three main geometrical parameters (stenosis degree, junction angle and diameter ratio). Assuming
the blood to be an incompressible Newtonian fluid, the non-linear system of Navier-Stokes equations is integrated
in time by a fully implicit second-order accurate fractional-step method. The space discretization is performed with
the help of the cell-centred finite volume method formulated for unstructured tetrahedral grids. In order to model
a realistic coronary blood flow, a time-dependent flow rate taken from corresponding literature is considered. For
the analysis of obtained numerical results, special emphasis is placed on their comparison in the form of velocity
isolines at several selected cross-sections during systolic and diastolic phases. The remainder of this paper is
devoted to discussion of walls shear stress distribution and its oscillatory character described by the oscillatory
shear index with regard to areas prone to development of intimal hyperplasia or to thrombus formation.
Description
Subject(s)
model bypassu, pujsující průtok krve, míra stenózy, metoda dělení časového kroku
Citation
Applied and Computational Mechanics. 2011, vol. 5, no. 1, p. 29-44.