Transient fluid-structure coupling for simulation of a trileaflet heart valve using weak coupling.

J Artif Organs

Biomechanics and Tissue Engineering Group, Industrial Research Institute IRIS, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia.

Published: September 2007

AI Article Synopsis

  • A three-dimensional numerical model was developed to simulate fluid-structure interaction in an aortic trileaflet heart valve during its initial opening phase.
  • The study utilized an arbitrary Lagrangian-Eulerian method to link fluid dynamics with the structural behavior of the valve, examining various conditions like Reynolds numbers and time progression.
  • Findings showed that initial leaflet opening creates a circulation zone downstream of the leaflet tip, affecting both wall shear stress distribution and its intensity along the leaflet's vertical and horizontal sections.

Article Abstract

In this article, a three-dimensional transient numerical approach coupled with fluid-structure interaction for the modeling of an aortic trileaflet heart valve at the initial opening stage is presented. An arbitrary Lagrangian-Eulerian kinematical description together with an appropriate fluid grid was used for the coupling strategy with the structural domain. The fluid dynamics and the structure aspects of the problem were analyzed for various Reynolds numbers and times. The fluid flow predictions indicated that at the initial leaflet opening stage a circulation zone was formed immediately downstream of the leaflet tip and propagated outward as time increased. Moreover, the maximum wall shear stress in the vertical direction of the leaflet was found to be located near the bottom of the leaflet, and its value decreased sharply toward the tip. In the horizontal cross section of the leaflet, the maximum wall shear stresses were found to be located near the sides of the leaflet.

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Source
http://dx.doi.org/10.1007/s10047-006-0365-9DOI Listing

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