Characteristics of Hemodynamics in a Bileaflet Mechanical Heart Valve using an Implicit FSI Method

Human heart valves diseased by congenital heart defects, rheumatic fever, bacterial infection, cancer may cause stenosis or insufficiency in the valves. Treatment may be with medication but often involves valve repair or replacement (insertion of an artificial heart valve). Bileaflet mechanical heart valves (BMHVs) are widely implanted to replace the diseased heart valves, but still suffer from complications such as hemolysis, platelet activation, tissue overgrowth and device failure. These complications are closely related to both flow characteristics through the valves and leaflet dynamics. In this study, the physiological flow interacting with the moving leaflets in a bileaflet mechanical heart valve (BMHV) is simulated with a strongly coupled implicit fluid-structure interaction (FSI) method which is newly organized based on the Arbitrary-Lagrangian-Eulerian (ALE) approach and the dynamic mesh method (remeshing) of FLUENT. The simulated results are in good agreement with previous experimental studies. This study shows the applicability of the present FSI model to the complicated physics interacting between fluid flow and moving boundary.

Authors:

• Tae-Hyub Hong
• Choeng-Ryul Choi
• Chang-Nyung Kim

Keywords:

• Bileaflet Mechanical Heart Valve
• Fluid- Structure Interaction.

References:

[1] Donea, J., Giuliani, S. and Halleux, J., "An arbitrary Lagrangian-Eulerian
finite element method for transient dynamic fluid-structure interactions."
Computer Methods in Applied Mechanics and Engineering, Vol. 33(1-3),
1982, pp. 689-723
[2] Peskin, C.S., "Flow patterns around heart valves: a numerical method."
Journal of Computational Physics Vol. 10, 1972, pp. 252-271
[3] Y., Yeo T.J.H., Zhao, Y. and Hwang, N.H.C., "Particle Image
Velocimetry Study of Pulsatile Flow in Bi-leaflet Mechanical Heart
Valves with Image Compensation Method", J Biol Phys, Vol. 32, 2006,
pp. 531-551
[4] Nobili M., Morbiducci U., Ponzini R., Gaudio C.D., Balducci A., Grigioni
M., Montevecchi M., Redaelli A., 2008, Numerical simulation of the
dynamics of a bileaflet prosthetic heart valve using a fluid-structure
interaction approach, Journal of Biomechanics, Vol. In press