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FDS guides: add DELAMINATION of SURF #14828

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shostikk merged 1 commit into from
Jul 4, 2025
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FDS guides: add DELAMINATION of SURF #14828

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6 changes: 5 additions & 1 deletion Manuals/FDS_User_Guide/FDS_User_Guide.tex
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Expand Up @@ -3323,7 +3323,9 @@ \subsubsection{Examples}
\label{box_burn_away_2D_fig}
\end{figure}


\subsection{Delamination of layers}
\label{info:surf_delamination}
Delamination (fall-off) of material layers can occur e.g. in glued materials, such as Cross-Laminated Timber (CLT). Two different criteria can be used to enforce a delamination of \ct{SURF} layers: \ct{DELAMINATION\_TMP(NL)} sets the temperature criterion; if the last cell of the layer \ct{NL} exceeds this temperature, all layers from the first to \ct{NL}'th (of this particular wall cell) will be removed. Their mass will simply disappear from the computation, and the following layer will befome the surface of the wall. Similarly, specifying \ct{DELAMINATION\_DENSITY(NL)} will remove the layers 1 to \ct{NL} if the density of the \ct{NL}th layer's last cell decreases below the threshold.

\newpage

Expand Down Expand Up @@ -13532,6 +13534,8 @@ \section{\texorpdfstring{{\tt SURF}}{SURF} (Surface Properties)}
\ct{CONVECTIVE_HEAT_FLUX} & Real & Section~\ref{info:convection} & \si{kW/m^2} & \\ \hline
\ct{CONVERT_VOLUME_TO_MASS} & Logical & Section~\ref{info:MASS_FLUX} & & \ct{F} \\ \hline
\ct{DEFAULT} & Logical & Section~\ref{info:SURF} & & \ct{F} \\ \hline
\ct{DELAMINATION_DENSITY(:)} & Real Array & Section~\ref{info:surf_delamination} & \si{kg/m^3} & \\ \hline
\ct{DELAMINATION_TMP(:)} & Real Array & Section~\ref{info:surf_delamination} & $^\circ$C & \\ \hline
\ct{DELTA_TMP_MAX} & Real & Section~\ref{info:solid_phase_stability} & $^\circ$C & 10 \\ \hline
\ct{DRAG_COEFFICIENT} & Real & Section~\ref{info:boundary_fuel_model} & & 2.8 \\ \hline
\ct{DSC_CONVERSION_FACTOR} & Real & Section~\ref{info:TGA_DSC_MCC} & & 1 \\ \hline
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