Scale-Resolving Simulations of Steady and Pulsatile Flow Through Healthy and Stenotic Heart Valves
| Autor: | Mcm Marcel Rutten, F.N. van de Vosse, M. J. M. M. Hoeijmakers, V. Morgenthaler |
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| Přispěvatelé: | Eindhoven MedTech Innovation Center, Cardiovascular Biomechanics |
| Rok vydání: | 2021 |
| Předmět: |
Aortic valve
Biomedical Engineering Pulsatile flow Constriction Pathologic 030204 cardiovascular system & hematology Computational fluid dynamics 01 natural sciences 010305 fluids & plasmas 03 medical and health sciences symbols.namesake 0302 clinical medicine Physiology (medical) 0103 physical sciences medicine Humans Computer Simulation Physics business.industry Turbulence Models Cardiovascular Reynolds number Mechanics medicine.anatomical_structure Flow (mathematics) Aortic Valve Heart Valve Prosthesis Pulsatile Flow Turbulence kinetic energy symbols business Reynolds-averaged Navier–Stokes equations Blood Flow Velocity |
| Zdroj: | Journal of Biomechanical Engineering : Transactions of the ASME, 144(3). American Society of Mechanical Engineers |
| ISSN: | 1528-8951 0148-0731 |
| Popis: | Blood-flow downstream of stenotic and healthy aortic valves exhibits intermittent random fluctuations in the velocity field which are associated with turbulence. Such flows warrant the use of computationally demanding scale-resolving models. The aim of this work was to compute and quantify this turbulent flow in healthy and stenotic heart valves for steady and pulsatile flow conditions. Large eddy simulations (LESs) and Reynolds-averaged Navier–Stokes (RANS) simulations were used to compute the flow field at inlet Reynolds numbers of 2700 and 5400 for valves with an opening area of 70 mm2 and 175 mm2 and their projected orifice-plate type counterparts. Power spectra and turbulent kinetic energy were quantified on the centerline. Projected geometries exhibited an increased pressure-drop (>90%) and elevated turbulent kinetic energy levels (>147%). Turbulence production was an order of magnitude higher in stenotic heart valves compared to healthy valves. Pulsatile flow stabilizes flow in the acceleration phase, whereas onset of deceleration triggered (healthy valve) or amplified (stenotic valve) turbulence. Simplification of the aortic valve by projecting the orifice area should be avoided in computational fluid dynamics (CFD). RANS simulations may be used to predict the transvalvular pressure-drop, but scale-resolving models are recommended when detailed information of the flow field is required. |
| Databáze: | OpenAIRE |
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