Detail publikace

Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study

JAGOŠ, J. KOHÚT, J. KOTEK, M. SKÁCEL, P. BURŠA, J.

Originální název

Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The presented paper aims at comparison of modelling approaches to a pulsatile fluid flow in aorta-like tube; it investigates their influence on the shape of the velocity profiles and waveforms, and consequently on wall shear stress. Comparisons of computational results between rigid and compliant tubes with laminar and low Re turbulent models of fluid are presented. The results were validated with PIV experimental data through the velocity profile in the half-length section of the tube for both cases (rigid and compliant) and the overall agreement was very good, almost perfect for the rigid case. Frequency of the pulse pump in the experimental circuit was 1Hz, the diameter of the tube similar to 20 mm, and maximum deformation of the compliant tube during a period was 12%. The turbulent model improved the agreement with the experimental data by flattening the velocity profiles in both cases, but the effect was much more pronounced for the compliant tube, especially during the deceleration phase. This work confirms the hypothesis stated by Brindise and Vlachos (2018) that a longer deceleration phase triggers transition to turbulence. We put foundations for extension of this hypothesis to compliant tubes where this conclusion was confirmed for physiological Reynolds and Womersley numbers. The main outputs of this study are: (i) the length of deceleration phase should be considered (in addition to the geometry or severity of stenosis) in decision whether fluid simulations should be performed with or without laminar flow assumption; (ii) for fluid simulations of blood vessels considering their compliance, a special care should be devoted to time synchronization between BCs to prevent unphysiological waveforms.

Klíčová slova

Pulsatile flow; Pulse wave velocity; Compliant tube; Low Re turbulent model; Boundary condition

Autoři

JAGOŠ, J.; KOHÚT, J.; KOTEK, M.; SKÁCEL, P.; BURŠA, J.

Vydáno

1. 9. 2021

Nakladatel

Isfahan University of Technology

Místo

ISFAHAN

ISSN

1735-3645

Periodikum

Journal of Applied Fluid Mechanics

Ročník

14

Číslo

5

Stát

Íránská islámská republika

Strany od

1411

Strany do

1420

Strany počet

10

URL

https://jafmonline.net/JournalArchive/download?file_ID=56401&issue_ID=1014

Plný text v Digitální knihovně

http://hdl.handle.net/11012/201634

BibTex

@article{BUT172470,
  author="Jiří {Jagoš} and Jiří {Kohút} and Michal {Kotek} and Pavel {Skácel} and Jiří {Burša}",
  title="Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study",
  journal="Journal of Applied Fluid Mechanics",
  year="2021",
  volume="14",
  number="5",
  pages="1411--1420",
  doi="10.47176/jafm.14.05.32291",
  issn="1735-3645",
  url="https://jafmonline.net/JournalArchive/download?file_ID=56401&issue_ID=1014"
}