PTR3: Structures, fluids and interactions

The research conducted at the Dupuy de Lôme Research Institute (Institut de Recherche Dupuy de Lôme – IRDL, UMR CNRS 6027) focuses on fluid-structure interactions, dynamic behavior of materials and structures, and detonics. Applications involve naval architecture, marine energies, defense, aerospace, as well as automotive and manufacturing processes.

Research focus

Naval hydrodynamics and the study of the response of structures in interaction with fluids.
Characterization and modeling of the response of metal and composite materials and structures, under dynamic loads.
Studies and modeling of impact and explosion phenomena in complex environments.

Expertise

Hydrodynamic impact, experimental approach and modeling
Numerical methods involving a large number of variables, instability prediction and bifurcation flow monitoring (low Reynolds number)
Behavior model development to describe the static (forming) and dynamic response of complex continua
Experimental demonstration of specific transient behaviors
Dynamic measurement of fields of state variables
Using simulation models and tools reliable enough to process all couplings while limiting the calculation time.

Keywords

Modeling, numerical simulation, experimental mechanics, materials and structures, dynamics/shocks/impacts, fluid-structure interactions.

THE IRDL WEBSITE /PTR3

Examples of research programs in which ENSTA Bretagne is involved:

COBADI: Design of a tool for the sizing of a two-phase barrier against the effects of explosions (Conception d’un Outil de dimensionnement de BArrière DIphasique)

Explosive devices pose a significant threat to property and people. The explosion generates significant thermal effects, a blast wave, and the scattering of fragments at initial speeds of about 2,000 m/s.

In order to protect against these effects, the solution is to interpose a physical barrier between the charge and its potential targets. Liquid foams (dispersion of a liquid phase within a gaseous phase) are excellent materials for attenuating sound waves, blast waves, and for decelerating projectiles.

The main aim of the COBADI project is the simple, fast in situ sizing of a two-phase protective barrier in accordance with the parameters relating to the threat (blast wave and hypervelocity fragment properties) and the liquid foam. The study aims to establish a substantial experimental database to describe the behavior of foams over a wide range of parameters and thereby be able to design an optimized foam for a targeted threat.

STADINAV

Probabilistic analysis of the nonlinear rolling of ships subjected to irregular swell [AID funding, in cooperation with Ecole navale]. This project aims to develop new methods to predict the risk of ships capsizing.

PROBALCAV Cavitating ballistic protection

The ANR ASTRID MATURATION* project "PROBALCAV" (which stands for cavitating ballistic protection) has civilian and military applications. Its aim is to design an innovative concept for protection against projectiles, based on shock-induced cavitation.