Fully coupled dynamic simulations of bioprosthetic aortic valves based on an embedded strategy for fluid-structure interaction with contact
Autor: | Maria Giuseppina Chiara Nestola, Rolf Krause, Lisa Gaedke-Merzhäuser, Patrick Zulian |
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Rok vydání: | 2020 |
Předmět: |
0206 medical engineering
Flow (psychology) 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Stress (mechanics) Physiology (medical) 0103 physical sciences Fluid–structure interaction Fluid dynamics Medicine Humans Computer Simulation Stress concentration Computer simulation business.industry Hemodynamics Models Cardiovascular Mechanics 020601 biomedical engineering Aortic Valve Heart Valve Prosthesis Flow conditioning Stress Mechanical Cardiology and Cardiovascular Medicine Material properties business |
Zdroj: | Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology. 23(23 Suppl 1) |
ISSN: | 1532-2092 |
Popis: | Aims This work aims at presenting a fully coupled approach for the numerical solution of contact problems between multiple elastic structures immersed in a fluid flow. The key features of the computational model are (i) a fully coupled fluid–structure interaction with contact, (ii) the use of a fibre-reinforced material for the leaflets, (iii) a stent, and (iv) a compliant aortic root. Methods and results The computational model takes inspiration from the immersed boundary techniques and allows the numerical simulation of the blood–tissue interaction of bioprosthetic heart valves (BHVs) as well as the contact among the leaflets. First, we present pure mechanical simulations, where blood is neglected, to assess the performance of different material properties and valve designs. Secondly, fully coupled fluid–structure interaction simulations are employed to analyse the combination of haemodynamic and mechanical characteristics. The isotropic leaflet tissue experiences high-stress values compared to the fibre-reinforced material model. Moreover, elongated leaflets show a stress concentration close to the base of the stent. We observe a fully developed flow at the systolic stage of the heartbeat. On the other hand, flow recirculation appears along the aortic wall during diastole. Conclusion The presented FSI approach can be used for analysing the mechanical and haemodynamic performance of a BHV. Our study suggests that stresses concentrate in the regions where leaflets are attached to the stent and in the portion of the aortic root where the BHV is placed. The results from this study may inspire new BHV designs that can provide a better stress distribution. |
Databáze: | OpenAIRE |
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