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research-article

Flow-structure interaction simulations of the aortic heart valve at physiologic conditions: The role of tissue constitutive model

[+] Author and Article Information
Anvar Gilmanov

Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN 55414
gilmanov.anvar@gmail.com

Henryk Stolarski

Department of Civil, Env and Geo-Eng, University of Minnesota, Minneapolis, MN 55414
stola001@umn.edu

Fotis Sotiropoulos

College of Engineering and Applied Sciences, Stony Brook University, Stony Brook, NY 11794-2200
fotis.sotiropoulos@stonybrook.edu

1Corresponding author.

ASME doi:10.1115/1.4038885 History: Received December 20, 2016; Revised December 28, 2017

Abstract

The blood flow patterns in the region around the aortic valve depend on the geometry of the aorta and on the complex flow-structure interaction between the pulsatile flow and the valve leaflets. Consequently, the flow depends strongly on the constitutive properties of the tissue, which can be expected to vary between healthy and diseased heart valves or native and prosthetic valves. In this work we seek to demonstrate the role of tissue constitutive model on aortic valve hemodynamics. We employ the Curvilinear Immersed Boundary - Finite Element - Fluid Structure Interaction (CURVIB-FE-FSI) method developed by Gilmanov et al. (2015) [1] to simulate an aortic valve in an anatomic aorta at physiologic conditions. Two constitutive models are incorporated into the FSI solver, both used in the past in heart valve analyzes: 1) the Saint Venant (StV) model; and 2) the May-Newman\&Yin (MNY) model. The MNY model is more general and includes nonlinear, anisotropic effects. It is appropriate to model the behavior of both prosthetic and biological tissue including native valves. Both models are employed to carry out FSI simulations of the same valve in the same aorta anatomy. The computed results reveal dramatic differences in both the vorticity dynamics in the aortic sinus and the wall shear-stress patterns on the aortic valve leaflets and underscore the importance of tissue constitutive models for clinically relevant simulations of aortic valves.

Copyright (c) 2017 by ASME
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