Energy distribution and spectral analysis of the turbulent flow downstream of stenotic and bioprosthetic aortic valves

Corso, Pascal; Frouzakis, Christos Emmanouil; Obrist, Dominik (September 2022). Energy distribution and spectral analysis of the turbulent flow downstream of stenotic and bioprosthetic aortic valves (Unpublished). In: 14th European Fluid Mechanics Conference (EFMC14). Athens (Greece).

Haemodynamic turbulence due to aortic stenoses or non-optimal bioprosthetic aortic valves (BAV) during peak flow may contribute to a variety of pathophysiological effects (Stein and Sabbah, 1976). We intend to characterise the energy carried by the turbulent fluctuations and the turbulent spectra for three valvular configurations using a direct numerical simulation of the incompressible flow downstream of a fixed-wall aortic stenosis (Corso et al., 2021) and 3D fluid-structure interaction simulations of BAV with moving leaflets (Nestola et al., 2019). The time-varying orifice shape of the BAV and the reduced orifice area of the stenosis is responsible for distinct large-scale anisotropic eddies. Despite a higher turbulence intensity in the stenotic case, the three-dimensional wavenumber spectra considered at one point (Frost and Moulden, 1977) in the ascending aorta and close to the sino-tubular junction display the typical inertial subrange in the three cases. By analysing the energy-bearing turbulent features and linking them to geometrical leaflet parameters, we shed light on an optimised leaflet design for improved valve performance.

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