Academic literature on the topic 'Fluid structure interaction, mechanical heart valves, vortex formation'

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Journal articles on the topic "Fluid structure interaction, mechanical heart valves, vortex formation"

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Zbavitel, Jan, and Simona Fialová. "A numerical study of hemodynamic effects on the bileaflet mechanical heart valve." EPJ Web of Conferences 213 (2019): 02103. http://dx.doi.org/10.1051/epjconf/201921302103.

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The work is focused on calculating hemodynamically negative effects of a flow through bileaflet mechanical heart valves (BMHV). Open-source FOAM-extend and cfMesh libraries were used for numerical simulation, the leaflet movement was solved as a fluid-structure interaction. A real model of the Sorin Bicarbon heart valve was employed as the default geometry for the following shape improvement. The unsteady boundary conditions correspond to physiological data of a cardiac cycle. It is shown how the modification of the shape of the original valve geometry positively affected the size of backflow
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Radhakrishnan, Pradeep. "Heart as an Inverted Octagonal Pyramid: Fluid Dynamics of Cardiac Ejection." International Journal of Cardiovascular and Thoracic Surgery 11, no. 3 (2025): 23–30. https://doi.org/10.11648/j.ijcts.20251103.11.

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Accurate geometric modeling of the human heart is essential for understanding and simulating cardiac fluid dynamics. Traditional left ventricular (LV) models—typically ellipsoidal, cylindrical, or conical—are limited in their ability to represent the complex regional structure and dynamic flow conditions present in a functioning heart. This study proposes an advanced geometric abstraction: the inverted octagonal pyramid model of the LV. This configuration introduces eight triangular faces converging at the apex, with an anatomically inspired octagonal base representing the mitral valve annulus
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Ghanbari, Jaafar, Amirhossein Dehparvar, and Amirhossein Zakeri. "Design and Analysis of Prosthetic Heart Valves and Assessing the Effects of Leaflet Design on the Mechanical Attributes of the Valves." Frontiers in Mechanical Engineering 8 (February 4, 2022). http://dx.doi.org/10.3389/fmech.2022.764034.

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Prosthetic heart valves are commonly used as a treatment for aortic valve deficiencies. The performance of these prosthetic valves should be in accordance with the natural heart valve with respect to opening and closing, blood flow, and vortex formation. These performance parameters depend on the design of leaflets and overall geometrical parameters of the valve. To better understand the effects of leaflet design on the performance of the valve, we have carried out fully coupled fluid–structure interaction analyses of opening and closing of prosthetic heart valves with various leaflet designs.
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Ahmed, Meraj, Nirmal Gupta, Rashmoni Jana, Malay K. Das, and Kamal K. Kar. "Ramifications of Vorticity on Aggregation and Activation of Platelets in Bi-Leaflet Mechanical Heart Valve: Fluid–Structure-Interaction Study." Journal of Biomechanical Engineering 144, no. 8 (2022). http://dx.doi.org/10.1115/1.4053665.

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Abstract Bileaflet mechanical heart valves (BMHV) are widely implanted to replace diseased heart valves. Despite many improvements in design, these valves still suffer from various complications, such as valve dysfunction, tissue overgrowth, hemolysis, and thromboembolism. Thrombosis and thromboembolism are believed to be initiated by platelet activation due to contact with foreign surfaces and nonphysiological flow patterns. The implantation of the valve causes nonphysiological patterns of vortex shedding behind the leaflets. This study signifies the importance of vorticity in platelet activa
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Govindarajan, V., H. S. Udaykumar, L. H. Herbertson, S. Deutsch, K. B. Manning, and K. B. Chandran. "Two-Dimensional FSI Simulation of Closing Dynamics of a Tilting Disk Mechanical Heart Valve." Journal of Medical Devices 4, no. 1 (2010). http://dx.doi.org/10.1115/1.4000876.

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The fluid dynamics during valve closure resulting in high shear flows and large residence times of particles has been implicated in platelet activation and thrombus formation in mechanical heart valves. Our previous studies with bileaflet valves have shown that large shear stresses induced in the gap between the leaflet edge and valve housing results in relatively high platelet activation levels, whereas flow between the leaflets results in shed vortices not conducive to platelet damage. In this study we compare the result of closing dynamics of a tilting disk valve with that of a bileaflet va
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Bornemann, Karoline-Marie, and Dominik Obrist. "Leaflet fluttering changes laminar–turbulent transition mechanisms past bioprosthetic aortic valves." Physics of Fluids 37, no. 5 (2025). https://doi.org/10.1063/5.0270405.

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Bioprosthetic heart valves (BHV) are implantable devices for aortic valve replacement in patients with moderate to severe aortic stenosis. BHV create turbulent flow during peak systole, potentially causing adverse effects and contributing to their limited durability of 10–15 years. Although a deeper understanding of turbulence is important for valve design optimization, laminar–turbulent transition mechanisms past BHV are still poorly understood. This study performs high-fidelity fluid–structure interaction simulations for generic aortic geometries with BHV to assess how leaflet fluttering cha
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Dissertations / Theses on the topic "Fluid structure interaction, mechanical heart valves, vortex formation"

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Vukicevic, Marija. "Vortex formation behind movable leaflet: experimental and numerical studies." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/5368.

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2009/2010<br>Fluid structure interaction (FSI) is one of fundamental phenomena encountered everywhere in nature or in industrial systems as well as one of the most studied and the most challenging topics in the fluid mechanics. Its research presents the core objective of this dissertation, along with experimental study of artificial heart devices. Better understanding of FSI could turn the still unexploited phenomenon into a powerful tool for resolving wealthy of multi-physics problems. Recently computational fluid dynamics community has been putting enormous efforts to uncover, make clear and
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Conference papers on the topic "Fluid structure interaction, mechanical heart valves, vortex formation"

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Smadi, Othman, Ibrahim Hassan, Philippe Pibarot, and Lyes Kadem. "Bileaflet Prosthetic Heart Valve Disease: Numerical Approach Using 3-D Fluid-Structure Interaction Model With Realistic Aortic Root." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31203.

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Surgical replacement, in the incidence of severely diseased heart valve, is vital in order to restore the normal heart function. Every year around 280,000 valve replacements occur around the world, half of them are bileaflet mechanical heart valves (BMHVs). Despite the remarkable improvement in valve design resulting in minimizing prosthetic valve complications (thromboembolic events or pannus formation), these complications are still possible with BMHV Implantation. As a consequence, an obstruction in one or both MHV leaflets could happen and threaten the patient life. In the present study, a
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Morbiducci, Umberto, Raffaele Ponzini, Matteo Nobili, et al. "Prediction of Shear Induced Platelet Activation in Prosthetic Heart Valves by Integrating Fluid–Structure Interaction Approach and Lagrangian-Based Blood Damage Model." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206162.

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Altered haemodynamics are implicated in the blood cells damage that leads to thromboembolic complications in presence of prosthetic cardiovascular devices, with platelet activation being the underlying mechanism for cardioemboli formation in blood flow past mechanical heart valves (MHVs). Platelet activation can be initiated and maintained by flow patterns arising from blood flowing through the MHV, and can lead to an enhancement in the aggregation of platelets, increasing the risk for thromboemboli formation. Hellums and colleagues compiled numerous experimental results to depict a locus of i
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Chen, Huang, Primož Drešar, Bryan Lynch, Paarth Sharma, Christopher Williams, and Joseph Katz. "Experimental Investigation of the Flow Inside the Rotor Passage of an Axial Ventricular Assist Device." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5660.

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Abstract Ventricular assist devices (VAD) are designed to provide circulatory support to patients suffering from advanced-stage heart failure. While not pulsatile, the advantages of continuous axial flow VADs include a compact size and low mechanical failure rate. However, being compact, they operate at high speed, resulting in adverse effects, such as hemolysis caused by high flow shear and thrombosis formation in stagnant regions are common and threaten the successful use of the device. While state-of-the-art computational fluid dynamics (CFD) is widely used in designing these devices, detai
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