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Analysis of blood flow interacted with leaflets in MHV in view of fluid-structure interaction

  • Thermal Engineering · Fluid Engineering · Energy and Power Engineering
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Abstract

Interaction of blood flow and leaflet behavior in a bileaflet mechanical heart valve was investigated using computational analysis. Blood flows of a Newtonian fluid and a non-Newtonian fluid with Carreau model were modeled as pulsatile, laminar, and incompressible. A finite volume computational fluid dynamics code and a finite element structure dynamics code were used concurrently to solve the flow and structure equations, respectively, where the two equations were strongly coupled. Physiologic ventricular and aortic pressure waveforms were used as flow boundary conditions. Flow fields, leaflet behaviors, and shear stresses with time were obtained for Newtonian and non-Newtonian fluid cases. At the fully opened phase three jets through the leaflets were found and large vortices were present in the sinus area. At the very final stage of the closing phase, the angular velocity of the leaflet was enormously large. Large shear stress was found on leaflet tips and in the orifice region between two leaflets at the final stage of closing phase. This method using fluid-structure interaction turned out to be a useful tool to analyze the different designs of existing and future bileaflet valves.

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Abbreviations

[C]:

Damping matrix

D ij :

Elasticity matrix

<F>:

Force vector

[IC]:

Influence coefficient

[K]:

Stiffness matrix

[M]:

Mass matrix

N i :

Shape function

<p b b :

Pressure at fluid-structure boundary

<q>:

Displacement vector

<q>b :

Velocity of structure at fluid-structure interface

Q :

Flow rate

t :

Time

U i :

Cartesian velocity component

U j :

Velocity component

X i :

Cartesian coordinate

\(\dot \gamma \) :

Shear rate

μ s :

Damping parameter

ρ s :

Density of the structure

θ:

Leaflet angle

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Authors and Affiliations

  1. Mechanical Engineering Department, Graduate School of Kyunghee University, 1 Seochon, Kihung, Yongin, 449-701, Kyunggi, Korea

    Choeng Ryul Choi

  2. College of Mechanical & Industrial System Engineering, Kyunghee University, Korea

    Chang Nyung Kim

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  1. Choeng Ryul Choi
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  2. Chang Nyung Kim
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Correspondence to Choeng Ryul Choi.

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Choi, C.R., Kim, C.N. Analysis of blood flow interacted with leaflets in MHV in view of fluid-structure interaction. KSME International Journal 15, 613–622 (2001). https://doi.org/10.1007/BF03184377

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  • DOI: https://doi.org/10.1007/BF03184377

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