Orateur
Description
Fluid-structure interaction (FSI) is a complex multiphysic coupling to implement:
- The two physics are often considered strongly coupled;
- The formalism of each physics differs (Lagrangian/Eulerian);
- Large deformations are present in the fluid and often in the solid;
- Very fine meshing is required to accurately capture certain phenomena (stress concentration, vortices);
- Complex and time-varying boundary conditions;
- The problem is inherently nonlinear for the fluid part and potentially for the solid.
To date, modelling a complex FSI system (airbag deployment, wind turbine dynamics, behaviour of an underwater pipeline, etc.) requires a massive mobilisation of computational resources, whilst producing results whose quality often leaves room for improvement. The aim is to propose an innovative approach, which is both accurate and computationally efficient, to numerically represent some FSI cases that are sufficiently separable to use a priori model order reduction techniques. Finally the extended PGD method [BEC25], a piecewise formulation for problems with a time evolving expanding spatial domain, will eventually be adapted for FSI problems involving moving surfaces.