Constantin presents the Euler equations of ideal incompressible fluids
and the blow-up problem for the Navier-Stokes equations of viscous
fluids, describing major mathematical questions of turbulence theory.
These are connected to the Caffarelli-Kohn-Nirenberg theory of
singularities for the incompressible Navier-Stokes equations, explained
in Gallavotti's lectures. Kazhikhov introduces the theory of strong
approximation of weak limits via the method of averaging, applied to
Navier-Stokes equations. Y. Meyer focuses on nonlinear evolution
equations and related unexpected cancellation properties, either imposed
on the initial condition, or satisfied by the solution itself, localized
in space or in time variable. Ukai discusses the asymptotic analysis
theory of fluid equations, the Cauchy-Kovalevskaya technique for the
Boltzmann-Grad limit of the Newtonian equation, the multi-scale
analysis, giving compressible and incompressible limits of the Boltzmann
equation, and the analysis of their initial layers.