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Updated: Mar 12, 2026
Particle Image Velocimetry Investigation of Hemodynamics via Aortic Phantom
Published on: February 25, 2022
Fluid-Structure Interaction Study of Transcatheter Aortic Valve Dynamics Using Smoothed Particle Hydrodynamics
Wenbin Mao1, Kewei Li1,2, Wei Sun3
1Tissue Mechanics Laboratory, The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 206 Technology Enterprise Park, 387 Technology Circle, Atlanta, GA, 30313-2412, USA.
A new fluid-structure interaction (FSI) model using smoothed particle hydrodynamics (SPH) accurately simulates transcatheter aortic valve (TAV) dynamics. This FSI model reveals critical differences in leaflet behavior compared to FE-only models, especially during valve closure.
Area of Science:
- Biomedical Engineering
- Computational Fluid Dynamics
- Medical Device Simulation
Background:
- Accurate computational modeling of heart valve dynamics, integrating fluid and structural behaviors, presents significant challenges.
- Existing models often simplify the complex interactions between blood flow and valve tissue, potentially limiting predictive accuracy.
Purpose of the Study:
- To develop and validate a novel, fully-coupled fluid-structure interaction (FSI) model for transcatheter aortic valves (TAV).
- To investigate the impact of FSI modeling versus finite element (FE)-only approaches on TAV leaflet dynamics and stress distribution.
- To assess the influence of leaflet material anisotropy on TAV performance.
Main Methods:
- A fully-coupled FSI model was developed using smoothed particle hydrodynamics (SPH) for fluid dynamics and a nonlinear finite element (FE) model for TAV structures.
- Comparative simulations were conducted using FE-only and FSI models, with both isotropic and anisotropic material properties for the leaflets.
- Leaflet kinematics, stress, and strain were analyzed throughout the cardiac cycle.
Main Results:
- Significant differences in leaflet kinematics were observed between FE-only and FSI models, with FSI providing more realistic dynamic deformation due to accurate loading.
- While stress and strain distributions were similar, peak stresses differed due to the fluid inertia-induced water hammer effect in the FSI model during closure.
- The FE-only model underestimated peak stresses by 13-28% compared to the FSI model.
- Tissue anisotropy had a minor effect on hemodynamics, but reduced radial stiffness could mitigate water hammer effects.
Conclusions:
- The developed FSI model accurately captures TAV leaflet dynamics and loading conditions, offering a more realistic simulation than FE-only models.
- The water hammer effect significantly influences peak leaflet stresses during valve closure, highlighting the importance of FSI in TAV analysis.
- This FSI modeling approach can enhance the assessment of valve dynamics and aid in optimizing future TAV designs.
