\section{Contents of a \dir{fview} data structure}\label{sect:dfview}

This directory contains information generated by the \moc{VAL:} module used to interpolate the diffusion flux computed for Cartesian geometries. The following options of calculations are currently implemented:
\begin{itemize}
\item 3D geometries tracked with \moc{TRIVAT:} using \moc{PRIM} (aka, variational collocation) method
\item 3D geometries tracked with \moc{TRIVAT:} using \moc{DUAL} (aka, Raviart-Thomas) method
\item 3D geometries tracked with \moc{TRIVAT:} using \moc{MCFD} (aka, nodal collocation) method
\end{itemize}

\subsection{The state-vector content}\label{sect:fviewstate}

\begin{itemize}

\item The total number of energy group $N_{g} = \mathcal{S}_{1}$

\item The number of mesh along X direction $N_{x} = \mathcal{S}_{2}$

\item The number of mesh along Y direction $N_{y} = \mathcal{S}_{3}$

\item The number of mesh along Z direction $N_{z} = \mathcal{S}_{4}$

\end{itemize}

\subsection{The main \dir{fview} directory}\label{sect:fviewdir}

\begin{DescriptionEnregistrement}{Records and sub-directories
 in \dir{fview} data structure}{7.0cm}
\CharEnr
 {SIGNATURE\blank{3}}{$*12$}
 {Signature of the \dir{fview} data structure ($\mathsf{SIGNA}=${\tt L\_FVIEW\blank{5}}).}


\IntEnr
  {STATE-VECTOR}{$40$}
  {Vector describing the various parameters associated with this data structure
  $\mathcal{S}$}

\RealEnr
  {MXI\blank{9}}{$N_{x}$}{}
  {array containing the mesh position along X-direction.}

\RealEnr
  {MYI\blank{9}}{$N_{y}$}{}
  {array containing the mesh position along Y-direction.}

\RealEnr
  {MZI\blank{9}}{$N_{z}$}{}
  {array containing the mesh position along Z-direction.}

\DirlEnr
  {FLUX\blank{8}}{$N_{g}$}
  {List of real arrays. Each component of this list is a real array of dimension $N_{x}*N_{y}*N_{z}$ containing
   the interpolated values of the flux in the energy group.}

\end{DescriptionEnregistrement}