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<p>This study addresses the practical challenge of selecting and improving robust fluid–structure interaction (FSI) solvers across regimes ranging from incompressible vortex-induced dynamics to compressible shock and flutter-driven phenomena, which are critical in aerospace, energy, and marine engineering. A unified framework is developed to compare two complementary <Emphasis FontCategory="NonProportional">OpenFOAM</Emphasis>-based solvers (foam-extend−4.1), designed for distinct flow regimes. The first solver targets incompressible flows and small linear deformations and was evaluated for the Hron–Turek FSI3 benchmark using a strong implicit coupling algorithm. The second solver, <Emphasis FontCategory="NonProportional">rhoSonicFsiFoam</Emphasis> for compressible flows, was initially coupled using ALG-0, a weak explicit coupling algorithm, and has been upgraded to ALG-1 to improve interface stability and convergence under strongly nonlinear aeroelastic conditions. All solvers were tested under identical numerical settings using reproducible metrics of accuracy, stability, computational cost, and mesh or time-step sensitivity. The methodology includes three representative benchmarks: the Hron–Turek FSI3 test, a supersonic panel flutter case, and a shock–structure interaction in a T80 shock tube. Results show amplitude and frequency errors below 3.7% and 1.92%, respectively. Finally, a domain-of-applicability diagram correlates flow compressibility with structural deformation amplitude, providing practical guidance for selecting and improving FSI solvers in aerospace and marine applications.</p>

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Explicit and Implicit OpenFOAM Coupling for a Compressible and Incompressible Fluid–Structure Interaction: A Comparative Study

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Samir Miloud Belghoula,
  • Abdessoufi Benhamou,
  • Abdallah Benarous,
  • Sylvain Guillou

摘要

This study addresses the practical challenge of selecting and improving robust fluid–structure interaction (FSI) solvers across regimes ranging from incompressible vortex-induced dynamics to compressible shock and flutter-driven phenomena, which are critical in aerospace, energy, and marine engineering. A unified framework is developed to compare two complementary OpenFOAM-based solvers (foam-extend−4.1), designed for distinct flow regimes. The first solver targets incompressible flows and small linear deformations and was evaluated for the Hron–Turek FSI3 benchmark using a strong implicit coupling algorithm. The second solver, rhoSonicFsiFoam for compressible flows, was initially coupled using ALG-0, a weak explicit coupling algorithm, and has been upgraded to ALG-1 to improve interface stability and convergence under strongly nonlinear aeroelastic conditions. All solvers were tested under identical numerical settings using reproducible metrics of accuracy, stability, computational cost, and mesh or time-step sensitivity. The methodology includes three representative benchmarks: the Hron–Turek FSI3 test, a supersonic panel flutter case, and a shock–structure interaction in a T80 shock tube. Results show amplitude and frequency errors below 3.7% and 1.92%, respectively. Finally, a domain-of-applicability diagram correlates flow compressibility with structural deformation amplitude, providing practical guidance for selecting and improving FSI solvers in aerospace and marine applications.