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. The main goal of this work is to qualitatively demonstrate that the choice of the constitutive model of the aortic valve is critical in analysis of heart hemodynamics. To accomplish that two different constitutive models were used in curvilinear immersed boundary–finite element–fluid–structure interaction (CURVIB-FE-FSI) method developed by Gilmanov et al. (2015, “A Numerical Approach for Simulating Fluid Structure Interaction of Flexible Thin Shells Undergoing Arbitrarily Large Deformations in Complex Domains,” J. Comput. Phys., 300, pp. 814–843.) to simulate an aortic valve in an anatomic aorta at physiologic conditions. The two constitutive models are: (1) the Saint-Venant (StV) model and (2) the modified 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.
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April 2018
Research-Article
Flow–Structure Interaction Simulations of the Aortic Heart Valve at Physiologic Conditions: The Role of Tissue Constitutive Model
Anvar Gilmanov,
Anvar Gilmanov
Saint Anthony Falls Laboratory,
University of Minnesota,
Minneapolis, MN 55414
e-mail: gilmanov.anvar@gmail.com
University of Minnesota,
Minneapolis, MN 55414
e-mail: gilmanov.anvar@gmail.com
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Henryk Stolarski,
Henryk Stolarski
Department of Civil, Environmental,
and Geo-Engineering,
University of Minnesota,
Minneapolis, MN 55414
e-mail: stola001@umn.edu
and Geo-Engineering,
University of Minnesota,
Minneapolis, MN 55414
e-mail: stola001@umn.edu
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Fotis Sotiropoulos
Fotis Sotiropoulos
College of Engineering and Applied Sciences,
Stony Brook University,
Stony Brook, NY 11794-2200
e-mail: fotis.sotiropoulos@stonybrook.edu
Stony Brook University,
Stony Brook, NY 11794-2200
e-mail: fotis.sotiropoulos@stonybrook.edu
Search for other works by this author on:
Anvar Gilmanov
Saint Anthony Falls Laboratory,
University of Minnesota,
Minneapolis, MN 55414
e-mail: gilmanov.anvar@gmail.com
University of Minnesota,
Minneapolis, MN 55414
e-mail: gilmanov.anvar@gmail.com
Henryk Stolarski
Department of Civil, Environmental,
and Geo-Engineering,
University of Minnesota,
Minneapolis, MN 55414
e-mail: stola001@umn.edu
and Geo-Engineering,
University of Minnesota,
Minneapolis, MN 55414
e-mail: stola001@umn.edu
Fotis Sotiropoulos
College of Engineering and Applied Sciences,
Stony Brook University,
Stony Brook, NY 11794-2200
e-mail: fotis.sotiropoulos@stonybrook.edu
Stony Brook University,
Stony Brook, NY 11794-2200
e-mail: fotis.sotiropoulos@stonybrook.edu
1Corresponding author.
Manuscript received December 20, 2016; final manuscript received December 28, 2017; published online January 23, 2018. Assoc. Editor: Keefe B. Manning.
J Biomech Eng. Apr 2018, 140(4): 041003 (9 pages)
Published Online: January 23, 2018
Article history
Received:
December 20, 2016
Revised:
December 28, 2017
Citation
Gilmanov, A., Stolarski, H., and Sotiropoulos, F. (January 23, 2018). "Flow–Structure Interaction Simulations of the Aortic Heart Valve at Physiologic Conditions: The Role of Tissue Constitutive Model." ASME. J Biomech Eng. April 2018; 140(4): 041003. https://doi.org/10.1115/1.4038885
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