Vortex structure and strength of secondary flows in model aortic arches

San-Yih Lin, Zhong Xin Yu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A numerical method is developed to study the flow structures in the aortic arch. The method solves the incompressible Navier-Stokes equations. It uses a third-order upwind scheme for the convective terms and the second-order central scheme for the viscous terms. A DDADI time integration is used for achieving fast convergence. For the unsteady solutions, the second-order Crank-Nicolson method coupled with the diagonalized diagonal dominated alternating direction implicit scheme (DDADI) time integration are used. The numerical results show that the method is about 2.5-order accuracy in space and 1.8-order accuracy in time. Then the method is used to investigate the vortex structure and strength of secondary flows in the aortic arch. Four different arch geometries are constructed to see the effect of arch configuration. Many flow properties such as pressure drop, vortex strength and separation are computed and compared among the four arch models.

Original languageEnglish
Pages (from-to)379-389
Number of pages11
JournalInternational Journal for Numerical Methods in Fluids
Volume40
Issue number3-4
DOIs
Publication statusPublished - 2002 Sep 30

Fingerprint

Secondary Flow
secondary flow
arches
Secondary flow
Arch
Arches
Vortex
Vortex flow
vortices
Alternating Direction
Implicit Scheme
Time Integration
Crank-Nicolson Method
Central Schemes
Autoregressive Conditional Heteroscedasticity
Upwind Scheme
Pressure Drop
Incompressible Navier-Stokes Equations
Term
Model

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Safety, Risk, Reliability and Quality
  • Applied Mathematics
  • Computational Theory and Mathematics
  • Computer Science Applications
  • Computational Mechanics
  • Mechanics of Materials

Cite this

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abstract = "A numerical method is developed to study the flow structures in the aortic arch. The method solves the incompressible Navier-Stokes equations. It uses a third-order upwind scheme for the convective terms and the second-order central scheme for the viscous terms. A DDADI time integration is used for achieving fast convergence. For the unsteady solutions, the second-order Crank-Nicolson method coupled with the diagonalized diagonal dominated alternating direction implicit scheme (DDADI) time integration are used. The numerical results show that the method is about 2.5-order accuracy in space and 1.8-order accuracy in time. Then the method is used to investigate the vortex structure and strength of secondary flows in the aortic arch. Four different arch geometries are constructed to see the effect of arch configuration. Many flow properties such as pressure drop, vortex strength and separation are computed and compared among the four arch models.",
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Vortex structure and strength of secondary flows in model aortic arches. / Lin, San-Yih; Yu, Zhong Xin.

In: International Journal for Numerical Methods in Fluids, Vol. 40, No. 3-4, 30.09.2002, p. 379-389.

Research output: Contribution to journalArticle

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