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ANGE is a joint team between CEREMA (Center for Research on Hazards, Environment, Mobility and Layout – Ministry of Ecology, Sustainable Development and Energy), Inria (Paris) and LJLL (Jacques-Louis Lions Laboratory : UPMC – University Paris 6 and CNRS).




The team is located both at LJLL (office 327, 3rd floor, corridor 16-26, 4 place Jussieu, 75005 Paris) and at Inria (2 rue Simone Iff, CS 42112, 75589 Paris cedex 12).

The modelling, the analysis and the simulation of geophysical flows are complex and challenging topics upon applied research and engineering. The growing importance of sustainable development issues coupled with the complexity of the aforementioned problems imply to go further than the classical shallow water type systems.
The issues investigated within the team mainly concern gravity driven flows such as hazardous flows (flooding, rogue waves, landslides, …), sustainable energies (hydrodynamics-biology coupling, biofuel production, marine energies, …), risk management and land-use planning (morphodynamic evolutions, early warning systems, …).

The research program of ANGE consists in deriving and analyzing models (PDE) of reduced complexity with respect to the Navier-Stokes equations and enriched with respect to the classic Shallow Water system. This process provides a hierarchy of models mainly of hyperbolic type (conservation laws). The main directions followed to derive intermediate models are:

  • non-hydrostatic effects which appear when the vertical acceleration of the fluid cannot be neglected;
  • stratified free surface flows over an arbitrary topography (most models and codes assume small and smooth variations of the bottom topography);
  • coupling between flows and structures/soils, coupling between models (e.g. coarse and fine) and coupling between numerical codes.

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