Méthode de Boltzmann sur réseau (LBM) en couplage fluide-structure avec rupture et fragmentation en écoulement compressible (Thèse 2022 - 2025)
Activités
CFD (Computational Fluid Dynamics)
Interaction Fluide/Structure
Lattice-Boltzmann Method
Immersed Boundary Method
Publications scientifiques au M2P2
2025
Hippolyte Lerogeron, Pierre Boivin, Vincent Faucher, Julien Favier. A Numerical Framework for Fast Transient Compressible Flows Using Lattice Boltzmann and Immersed Boundary Methods. International Journal for Numerical Methods in Engineering, 2025, 126 (3), ⟨10.1002/nme.7647⟩. ⟨hal-04958000⟩ Plus de détails...
This article is dedicated to the development of a model to simulate fast transient compressible flows on solid structures using immersed boundary method (IBM) and a lattice Boltzmann solver. Ultimately, the proposed model aims at providing an efficient algorithm to simulate strongly‐coupled fluid‐structure interactions (FSI). Within this goal, it is necessary to propose a precise and robust numerical framework and validate it on stationary solid cases first, which is the scope of the present study. Classical FSI methods, such as body‐fitted approaches, are facing challenges with moving or complex geometries in realistic conditions, requiring computationally expensive re‐meshing operations. IBM offers an alternative by treating the solid structure geometry independently from the fluid mesh. This study focuses on the extension of the IBM to compressible flows, and a particular attention is given to the enforcement of various thermal boundary conditions. A hybrid approach, combining diffuse forcing for Dirichlet‐type boundary conditions and ghost‐nodes forcing for Neumann‐type boundary conditions is introduced. Finally, a simplified model, relying only on diffuse IBM forcing, is investigated to treat specific cases where the fluid solid interface is considered as adiabatic. The accuracy of the method is validated through various test cases of increasing complexity.
Hippolyte Lerogeron, Pierre Boivin, Vincent Faucher, Julien Favier. A Numerical Framework for Fast Transient Compressible Flows Using Lattice Boltzmann and Immersed Boundary Methods. International Journal for Numerical Methods in Engineering, 2025, 126 (3), ⟨10.1002/nme.7647⟩. ⟨hal-04958000⟩
Journal: International Journal for Numerical Methods in Engineering
Hippolyte Lerogeron, Vincent Faucher, Pierre Boivin, Julien Favier. LBM-based partitioned coupling for fast transient fluid-structure dynamics. Applied Mathematical Modelling, 2025, 149, pp.116274. ⟨10.1016/j.apm.2025.116274⟩. ⟨cea-05163942⟩ Plus de détails...
This article explores the numerical modeling of fast transient fluid-structure interactions, focusing on a two-way explicit partitioned coupling for realistic and efficient simulations. The proposed approach involves a compressible lattice Boltzmann method (LBM) for fluid dynamics and a finite element code for structural dynamics. An immersed boundary method is used to model the fluid-structure interface. The proposed method is validated against various fluid-structure interactions cases, demonstrating good agreement with experimental and numerical references. A multi-scale coupling strategy optimizes the computational load, achieving efficient space-time resolution for each sub-system independently.
Hippolyte Lerogeron, Vincent Faucher, Pierre Boivin, Julien Favier. LBM-based partitioned coupling for fast transient fluid-structure dynamics. Applied Mathematical Modelling, 2025, 149, pp.116274. ⟨10.1016/j.apm.2025.116274⟩. ⟨cea-05163942⟩
