Flow physics of normal and abnormal bioprosthetic aortic valves

Jung Hee Seo, Chi Zhu, Jon Resar, Rajat Mittal

Research output: Contribution to journalArticlepeer-review

Abstract

Flow physics of transvalvular flows in the aorta with bioprosthetic valves are investigated using computational modelling. For the efficient simulations of flow-structure-interaction in transvalvular flows, a simplified, reduced degree of freedom valve model is employed with a sharp interface immersed boundary based incompressible flow solver. Simulations are performed for normal as well as abnormal valves with reduced leaflet motion that models the effect of early leaflet thrombosis. The structure of the aortic jet and the hemodynamic stresses on the aortic wall are analysed to understand the hemodynamic impacts and possible long-term clinical implications of sub-clinical, reduced leaflet motion. The simulation results have shown that the reduced leaflet motion tilts the direction of aortic jet and generates stronger flow separation and re-attachment on the aortic wall downstream from the reduced motion leaflets. The modified flow pattern increases the wall pressure fluctuation and average wall shear stress on the downstream aortic wall, and results in the asymmetric oscillatory shear index distributions, which may have long-term clinical implications such as aortic wall damage and remodelling.

Original languageEnglish (US)
Article number108740
JournalInternational Journal of Heat and Fluid Flow
Volume86
DOIs
StatePublished - Dec 2020

Keywords

  • Fluid structure interaction
  • Immersed boundary method
  • Leaflet thrombosis
  • Transcather aortic valve replacement

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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