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Two-dimensional fluid-structure interaction simulation of bileaflet mechanical heart valve flow dynamics
Rui Cheng1, Yong Gen Lai, Krishnan B Chandran
1IIHR-Hydroscience and Engineering, Department of Mechanical Engineering, College of Engineering, University of Iowa, Iowa City, IA, USA.
The Journal of Heart Valve Disease
|December 9, 2003
Summary
This study simulated bileaflet heart valve closure, revealing negative pressure transients and high wall shear stresses that may cause thromboembolism. These findings can inform improved mechanical heart valve design to reduce blood clot risks.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Cardiovascular Research
Background:
- Mechanical heart valves necessitate long-term anticoagulation due to thromboembolic risks.
- High wall shear stress and negative pressure transients during valve closure are implicated in thrombus initiation.
Purpose of the Study:
- To perform a 2D functional simulation of flow past bileaflet heart valves during closure.
- To incorporate fluid-structure interaction for leaflet motion analysis.
- To investigate factors contributing to thromboembolic complications.
Main Methods:
- Utilized a 2D fluid-structure interaction model based on Navier-Stokes equations and the arbitrary Lagrangian-Eulerian method.
- Coupled fluid dynamics with dynamic equations for leaflet motion.
- Performed parametric analysis on valve size, leaflet density, and resilience.
Main Results:
- Simulation validated against experimental data.
- Identified negative pressure transients near the inflow during closure, amplified by leaflet rebound.
- Observed high velocities and wall shear stresses in the leaflet-housing clearance, potentially damaging blood components.
Conclusions:
- The simulation model can analyze valve design parameters (geometry, dimensions, material).
- Aims to optimize mechanical heart valve design to minimize thromboembolic complications.
- Provides insights into flow dynamics during valve opening and closing phases.