/*!
\page ScalarModelsPage Scalar models

[TOC]


* 1- \subpage TransportEqPage "The transport equation "	

 
\f[
 \partial_t H + \vec{u}\cdot\vec{\nabla} H = \Phi+\lambda_{sf}(T_s-T)
\f]

where

- \f$ H \f$ the main unknown is the fluid enthalpy field
- \f$ \vec{u} \f$ is the constant transport velocity
- \f$ \Phi \f$ is the heat source term if explicitely known
- \f$ T_s \f$ is the rod temperature field provided by the user
- \f$ T=T_0+\frac{H-H_0}{c_p}\f$ is the fluid temperature field
- \f$ \lambda_{sf}\f$ is the fluid-rod heat transfer coefficient provided by the user
- \f$ c_p \f$ is the fluid specific heat, provided by the user and assumed constant


* 2- \subpage DiffusionEqPage "The diffusion equation "	

\f[
 \partial_t T =d\triangle T +\frac{ \Phi+\lambda_{sf}(T_f-T)}{\rho c_p}
\f]
where
- \f$T\f$ the main unknown is the rod temperature field
- \f$d=\frac{\lambda}{\rho c_p}\f$ is the rod diffusivity
- \f$\lambda_{sf}\f$ is the fluid-rod heat transfer coefficient provided by the user
- \f$\rho\f$ is the rod density assumed constant
- \f$c_p\f$ is the rod specific heat, provided by the user and assumed constant
- \f$\Phi\f$ is the heat source term if explicitely known
- \f$T_f\f$ is the fluid temperature field provided by the user

*/