Numerical Analysis of the Three‐Dimensional Blood Flow in the Korean Artificial Heart

Abstract

Flow in the blood sac of the Korean artificial heart is numerically simulated by finite element method. Fluid-structure interaction algorithm is employed to compute the three-dimensional blood flow interacting with the sac material. For verification of the numerical method of fluid-structure interaction, two-dimensional flow in a collapsible channel with initial tension is simulated and the results are compared with numerical solutions from the literature. Incompressible viscous flow and linear elastic solid are assumed for the blood and the sac material in the device, respectively. The motion of the actuator is simplified by a time-varying pressure boundary condition imposed on the outer surface of the sac. Numerical solutions on the unsteady three-dimensional blood flow in the sac are provided for the cactus-type model in this study. During systole, the inlet is closed and the blood sac is squeezed by the action of the prescribed pressure on the surface. During diastole, the sac is filled with the blood coming from the inlet while the outlet is closed. A strong flow to the outlet and a stagnated flow near the inlet are observed during systole. Shear stress distribution is also delineated to assess the possibility of thrombus formation. We also simulate numerically the hemodynamics of "the reversed model" where the inlet and outlet are reversed for surgical convenience. It is observed that a recirculating flow was generated near the inner corner of the sac in the reversed model. To assess the material strength of the sac, the shear stress distribution in the solid material is also presented.

Passive movement of human soft palate during respiration: A simulation of 3D fluid/structure interaction

“…Commercial software ADINA (version 8.6.5) was used for solving all the equations of fluid, structure, contact of the structure and FSI. As a well-tested software, ADINA has been extensively utilized to simulate FSI-related biomechanical problems such as interaction between blood flow and arterial wall (Tang et al, 1999a;Tang et al, 1999b;Valencia and Baeza, 2009), blood flow and human heart (Cheng et al, 2005;Doyle et al, 2010;Shim et al, 2003), blood flow and aneurysm (Leung et al, 2006;Molony et al, 2009;Valencia and Solis, 2006), and blood flow and atherosclerotic plaques (Tang et al, 2004). Particularly, Malv e et al (2010), by simulating the interaction between airflow and human trachea using ADINA, proved that the results agreed well with experiments.…”

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“…Shim et al. (7) evaluated the flow in the blood sac of a Korean artificial heart by a numerical simulation using the finite element method. Anderson et al.…”

“…(8) also examined the direction and magnitude of the flow as well as the dynamic pressure in their developed continuous flow ventricular assist device, CFVAD3. Most artificial heart groups have analyzed the fluid dynamics, such as blood fluid motion in chambers (7–11). However, this article concentrated on an analysis of the solid properties, which is a crucial factor for a durability study of the blood sac.…”

Artificial Organs 2003: A Year in Review

“…Eun Bo‐Shim et al of Kumoh National University of Technology (Seoul, South Korea) conducted numerical analysis of the dimensional blood flow of the Korean artificial heart (47). Design features were analyzed and related to performance.…”