The primitive equations of the atmosphere in presence of vapor   saturation
  A modification of the classical primitive equations of the atmosphere is considered in order to take into account important phase transition phenomena due to air saturation and condensation. We provide a mathematical formulation of the problem that appears to be new in this setting, by making use of differential inclusions and variational inequalities, and which allows to develop a rather complete theory for the solutions to what turns out to be a nonlinearly coupled system of non-smooth partial differential equations. Specifically we prove global existence of quasi-strong and strong solutions, along with uniqueness results and maximum principles of physical interest. 
Michele Coti Zelati, Aimin Huang, Igor Kukavica, Roger Temam, Mohammed   Ziane
math.AP