Sequentially-Coupled Arterial Fluid-Structure Interaction (SCAFSI) technique

Tayfun E. Tezduyar, Matthew Schwaab, Sunil Sathe

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

The Sequentially-Coupled Arterial Fluid-Structure Interaction (SCAFSI) technique is one of the special techniques developed recently by the Team for Advanced Flow Simulation and Modeling (T{star, open}AFSM) for FSI modeling of blood flow and arterial dynamics. The SCAFSI technique, which was introduced as an approximate FSI approach in arterial fluid mechanics, is based on the assumption that the arterial deformation during a cardiac cycle is driven mostly by the blood pressure. In the SCAFSI, first we compute a "reference" arterial deformation as a function of time, driven only by the blood pressure profile of the cardiac cycle. Then we compute a sequence of updates involving mesh motion, fluid dynamics calculations, and recomputing the arterial deformation. Although the SCAFSI technique was developed and tested in conjunction with the stabilized space-time FSI (SSTFSI) technique, it can also be used in conjunction with other FSI modeling techniques categorized as moving-mesh methods. The SSTFSI technique is based on the Deforming-Spatial-Domain/Stabilized Space-Time (DSD/SST) formulation and includes the enhancements introduced recently by the T{star, open}AFSM. The arterial structures can be modeled with the membrane or continuum elements, both of which are geometrically nonlinear, and the continuum element can be made of linearly-elastic or hyperelastic material (Mooney-Rivlin or Fung). Here we provide an overview of the SCAFSI technique and present a number of test computations for abdominal aortic and cerebral aneurysms, where the arterial geometries used in the computations are close approximations to the patient-specific image-based data.

Original languageEnglish
Pages (from-to)3524-3533
Number of pages10
JournalComputer Methods in Applied Mechanics and Engineering
Volume198
Issue number45-46
DOIs
Publication statusPublished - 2009 Sep 15
Externally publishedYes

Keywords

  • Cardiovascular fluid mechanics
  • Finite elements
  • Fluid-Structure Interactions
  • Sequentially-Coupled Arterial FSI
  • Space-time methods

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Computer Science Applications

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