/*!
\page physicalmodels The Physical Models   

\ref physicalmodels "The physical models" are presented in order of mathematical complexity: 

- \subpage ScalarModelsPage "The linear scalar problem" 
	+ \ref TransportEqPage 
	+ \ref DiffusionEqPage 
- \subpage NSModelsPage "The Navier-Stokes model" 
- \subpage twophasePage "The two-phase flow models"
	+ \ref DriftModelPage "The Drift model"
	+ \ref IsothermalPage "The isothermal two-fluid model"
	+ \ref FiveEqPage "The five equation two-fluid model"	




*/