Responsable du programme de Chirurgie Cardiaque Congénitale Adulte à l’Hôpital de la Timone
Activités
. Chirurgie cardiaque pédiatrique et congénitale adulte
. Chirurgie cardiaque néonatale
. Réparations/plasties valvulaires
. Transplantation cardiaque pédiatrique
Axes de recherche :
. Biomécanique & Physiologie Cardiovasculaire
. Anatomie Numérique et Structurelle
. Modélisation et Simulation Cardio-Vasculaire
Profil CTSNet : https://www.ctsnet.org/home/lmace
Publications scientifiques au M2P2
2024
Tom Fringand, Loic Mace, Isabelle Cheylan, Marien Lenoir, Julien Favier. Analysis of Fluid–Structure Interaction Mechanisms for a Native Aortic Valve, Patient-Specific Ozaki Procedure, and a Bioprosthetic Valve. Annals of Biomedical Engineering, 2024, 52 (11), pp.3021-3036. ⟨10.1007/s10439-024-03566-1⟩. ⟨hal-04928780⟩ Plus de détails...
The Ozaki procedure is a surgical technique which avoids to implant foreign aortic valve prostheses in human heart, using the patient’s own pericardium. Although this approach has well-identified benefits, it is still a topic of debate in the cardiac surgical community, which prevents its larger use to treat valve pathologies. This is linked to the actual lack of knowledge regarding the dynamics of tissue deformations and surrounding blood flow for this autograft pericardial valve. So far, there is no numerical study examining the coupling between the blood flow characteristics and the Ozaki leaflets dynamics. To fill this gap, we propose here a comprehensive comparison of various performance criteria between a healthy native valve, its pericardium-based counterpart, and a bioprosthetic solution, this is done using a three-dimensional fluid–structure interaction solver. Our findings reveal similar physiological dynamics between the valves but with the emergence of fluttering for the Ozaki leaflets and higher velocity and wall shear stress for the bioprosthetic heart valve.
Tom Fringand, Loic Mace, Isabelle Cheylan, Marien Lenoir, Julien Favier. Analysis of Fluid–Structure Interaction Mechanisms for a Native Aortic Valve, Patient-Specific Ozaki Procedure, and a Bioprosthetic Valve. Annals of Biomedical Engineering, 2024, 52 (11), pp.3021-3036. ⟨10.1007/s10439-024-03566-1⟩. ⟨hal-04928780⟩
Tom Fringand, Isabelle Cheylan, Marien Lenoir, Loic Mace, Julien Favier. A stable and explicit fluid–structure interaction solver based on lattice-Boltzmann and immersed boundary methods. Computer Methods in Applied Mechanics and Engineering, 2024, 421, pp.116777. ⟨10.1016/j.cma.2024.116777⟩. ⟨hal-04971126⟩ Plus de détails...
Fluid-structure interaction (FSI) occurs in a wide range of contexts, from aeronautics to biological systems. To numerically address this challenging type of problem, various methods have been proposed, particularly using implicit coupling when the fluid and the solid have the same density, i.e., the density ratio is equal to 1. Aiming for a computationally efficient approach capable of handling strongly coupled dynamics and/or realistic conditions, we present an alternative to the implicit formulation by employing a fully explicit algorithm. The Lattice Boltzmann Method (LBM) is used for the fluid, with the finite element method (FEM) utilized for the structure. The Immersed Boundary Method (IBM) is applied to simulate moving and deforming boundaries immersed in fluid flows. The novelty of this work lies in the combination of Laplacian smoothing at the fluid/solid interface, an improved collision model for the LBM, and a reduction of non-physical frequencies on the structure mesh. The use of these adaptations results in a solver with remarkable stability properties, a primary concern when dealing with explicit coupling. We validate the numerical framework on several challenging test cases of increasing complexity, including 2D and 3D configurations, density ratio of 1, and turbulent conditions.
Tom Fringand, Isabelle Cheylan, Marien Lenoir, Loic Mace, Julien Favier. A stable and explicit fluid–structure interaction solver based on lattice-Boltzmann and immersed boundary methods. Computer Methods in Applied Mechanics and Engineering, 2024, 421, pp.116777. ⟨10.1016/j.cma.2024.116777⟩. ⟨hal-04971126⟩
Journal: Computer Methods in Applied Mechanics and Engineering
