ENSTA Bretagne : recherche en mécanique, plate-forme technologique MASMECA
Julien Ogor

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.


  • 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.


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

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.


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. 

 [ANR ASTRID Maturation funding]


Sizing of floating wind turbines reflecting impacts and wave breaking [ANR/France Energies Marines funding]


Parametric optimization of foils; application to Olympic sailing

[Funding by Instituts Carnot ARTS et MERS, with Ecole navale and Ifremer]


 Transparent composite protection

[ANR ASTRID funding]


Survivability of Structure Against Energy deposition

[ANR ASTRID funding]


Materials providing protection against blast effects  (MAtériaux de Protection contre les effets de Souffle)

[ANR funding]

including 11 PhD students.
14 publications in peer-reviewed journals
(Key figures 2021)


Michel Arrigoni
Associate professor
+33(0)2 98 34 89 78