Fluid-Structure Interaction Simulation of an Aortic Bi-Leaflet Mechanical Heart Valve in a Patient-Specific Left Heart

2012 ◽  
Vol 2012 (4) ◽  
pp. 51
Author(s):  
Trung Bao Le ◽  
Fotis Sotiropoulos
Keyword(s):  
Heart Valve ◽  
Fluid Structure Interaction ◽  
Mechanical Heart Valve ◽  
Patient Specific ◽  
Left Heart ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Interaction Simulation

scholarly journals Image-Guided Fluid-Structure Interaction Simulation of Transvalvular Hemodynamics: Quantifying the Effects of Varying Aortic Valve Leaflet Thickness

Fluids ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 119 ◽  
Author(s):  
Anvar Gilmanov ◽  
Alexander Barker ◽  
Henryk Stolarski ◽  
Fotis Sotiropoulos
Keyword(s):  
Blood Flow ◽  
Aortic Valve ◽  
Heart Valve ◽  
Fluid Structure Interaction ◽  
Maximum Velocity ◽  
Patient Specific ◽  
Hemodynamic Parameters ◽  
Orifice Area ◽  
Fluid Structure ◽  
Structure Interaction

When flow-induced forces are altered at the blood vessel, maladaptive remodeling can occur. One reason such remodeling may occur has to do with the abnormal functioning of the aortic heart valve due to disease, calcification, injury, or an improperly-designed prosthetic valve, which restricts the opening of the valve leaflets and drastically alters the hemodynamics in the ascending aorta. While the specifics underlying the fundamental mechanisms leading to changes in heart valve function may differ from one cause to another, one common and important change is in leaflet stiffness and/or mass. Here, we examine the link between valve stiffness and mass and the hemodynamic environment in aorta by coupling magnetic resonance imaging (MRI) with high-resolution fluid–structure interaction (FSI) computational fluid dynamics to simulate blood flow in a patient-specific model. The thoracic aorta and a native aortic valve were re-constructed in the FSI model from the MRI data and used for the simulations. The effect of valve stiffness and mass is parametrically investigated by varying the thickness (h) of the leaflets (h = 0.6, 2, 4 mm). The FSI simulations were designed to investigate systematically progressively higher levels of valve stiffness by increasing valve thickness and quantifying hemodynamic parameters known to be linked to aortopathy and valve disease. The computed results reveal dramatic differences in all hemodynamic parameters: (1) the geometric orifice area (GOA), (2) the maximum velocity V max of the jet passing through the aortic orifice area, (3) the rate of energy dissipation E ˙ diss ( t ) , (4) the total loss of energy E diss , (5) the kinetic energy of the blood flow E kin ( t ) , and (6) the average magnitude of vorticity Ω a ( t ) , illustrating the change in hemodynamics that occur due to the presence of aortic valve stenosis.

NUMERICAL SIMULATION OF 3D FLUID-STRUCTURE INTERACTION USING AN IMMERSED MEMBRANE METHOD

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1447-1450 ◽  
Author(s):  
G. H. XIA ◽  
Y. ZHAO ◽  
J. H. YEO
Keyword(s):  
Numerical Simulation ◽  
Heart Valve ◽  
Fluid Structure Interaction ◽  
Mechanical Heart Valve ◽  
Three Dimensional ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Membrane Method ◽  
Interaction Phenomena

In this paper, an immersed membrane method (IMM) is proposed for the simulation of three-dimensional (3D) fluid-structure interaction phenomena in a mechanical heart valve (MHV).

Three-Dimensional Fluid-Structure-Interaction Simulation of Tilting Disk Mechanical Heart Valve

2013 ◽  
Author(s):  
Ardavan Aliabadi ◽  
Klaus A. Hoffmann
Keyword(s):  
Fluid Structure Interaction ◽  
Mechanical Heart Valve ◽  
Three Dimensional ◽  
Computational Effort ◽  
Residence Times ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Commercial Code ◽  
Interaction Simulation ◽  
Hemodynamic Performance

The current computational effort will focus on the numerical analysis of current tiling disk MHVs. In this work an implicit fluid-structure-interaction (FSI) simulation of the Bjork-Shiley design was carried out using in-house codes implemented in the commercial code software FLUENT™. In-house codes in the form of journal files, schemes, and user-defined functions (UDFs) were integrated to automate the inner iterations and enable communication between the fluid and the moving disk at the interfaces. Based on the investigations of the current simulations, a new design aiming at improving the hemodynamic performance is suggested. Hemodynamics of the flow in current tilting-disk valves is compared with the suggested design and it is concluded that the suggested design has a better hemodynamic performance in terms of shear stress values and residence times.

Sign in / Sign up

Export Citation Format

Share Document