2. Lorenz model for hydrodynamics

Atmospheric dynamics are governed by the equations of fluids and thermodynamics. We can see that meteorology has a complex behavior that appears "chaotic". In 1963 , Lorenz established a highly simplified model of the atmosphere that is highly sensitive to initial conditions. This property explains the chaotic behavior of his model's solutions. These same Lorenz equations are also obtained more rigorously in a very different mechanical model called the "Lorenz mill", presented at the Citée des Sciences de la Vilette and described in section