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.

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).

scholarly journals Hydroelastic behaviour of a structure exposed to an underwater explosion

2015 ◽  
Vol 373 (2033) ◽  
pp. 20140103 ◽  
Author(s):  
G. Colicchio ◽  
M. Greco ◽  
M. Brocchini ◽  
O. M. Faltinsen
Keyword(s):  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Underwater Explosion ◽  
Computational Effort ◽  
Elastic Plates ◽  
Fluid Structure ◽  
Flow Solver ◽  
Structure Interaction ◽  
Hydroelastic Interaction ◽  
Acoustic Phase

The hydroelastic interaction between an underwater explosion and an elastic plate is investigated num- erically through a domain-decomposition strategy. The three-dimensional features of the problem require a large computational effort, which is reduced through a weak coupling between a one-dimensional radial blast solver, which resolves the blast evolution far from the boundaries, and a three-dimensional compressible flow solver used where the interactions between the compression wave and the boundaries take place and the flow becomes three-dimensional. The three-dimensional flow solver at the boundaries is directly coupled with a modal structural solver that models the response of the solid boundaries like elastic plates. This enables one to simulate the fluid–structure interaction as a strong coupling, in order to capture hydroelastic effects. The method has been applied to the experimental case of Hung et al. (2005 Int. J. Impact Eng. 31 , 151–168 ( doi:10.1016/j.ijimpeng.2003.10.039 )) with explosion and structure sufficiently far from other boundaries and successfully validated in terms of the evolution of the acceleration induced on the plate. It was also used to investigate the interaction of an underwater explosion with the bottom of a close-by ship modelled as an orthotropic plate. In the application, the acoustic phase of the fluid–structure interaction is examined, highlighting the need of the fluid–structure coupling to capture correctly the possible inception of cavitation.

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