On the influence of the wall shear stress vector form on hemodynamic indicators

L. John, P. Pustějovská, O. Steinbach

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Hemodynamic indicators such as the averaged wall shear stress (AWSS) and the oscillatory shear index (OSI) are well established to characterize areas of arterial walls with respect to the formation and progression of aneurysms. Here, we study two different forms for the wall shear stress vector from which AWSS and OSI are computed. One is commonly used as a generalization from the two-dimensional setting, the latter is derived from the full decomposition of the wall traction force given by the Cauchy stress tensor. We compare the influence of both approaches on hemodynamic indicators by numerical simulations under different computational settings. Namely, different (real and artificial) vessel geometries, and the influence of a physiological periodic inflow profile. The blood is modeled either as a Newtonian fluid or as a generalized Newtonian fluid with a shear rate dependent viscosity. Numerical results are obtained by using a stabilized finite element method. We observe profound differences in hemodynamic indicators computed by these two approaches, mainly at critical areas of the arterial wall.

Originalspracheenglisch
Seiten (von - bis)113-122
Seitenumfang10
FachzeitschriftComputing and Visualization in Science
Jahrgang18
Ausgabenummer4-5
DOIs
PublikationsstatusVeröffentlicht - 1 Aug 2017

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Wall Shear Stress
Hemodynamics
Shear stress
Newtonian Fluid
Stabilized Finite Element Method
Aneurysm
Fluids
Stress Tensor
Progression
Vessel
Shear deformation
Cauchy
Tensors
Blood
Viscosity
Decomposition
Finite element method
Decompose
Numerical Simulation
Numerical Results

Schlagwörter

    ASJC Scopus subject areas

    • !!Theoretical Computer Science
    • Software
    • !!Modelling and Simulation
    • !!Engineering(all)
    • !!Computer Vision and Pattern Recognition
    • !!Computational Theory and Mathematics

    Dies zitieren

    On the influence of the wall shear stress vector form on hemodynamic indicators. / John, L.; Pustějovská, P.; Steinbach, O.

    in: Computing and Visualization in Science, Jahrgang 18, Nr. 4-5, 01.08.2017, S. 113-122.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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