Merge pull request firemodels#12237 from drjfloyd/master

FDS Validation Guide: Fix mixtex compilation error

Manuals/FDS_Validation_Guide/Burning_Rate_Chapter.tex

@@ -896,7 +896,7 @@ \subsection{Aalto Woods}
 
 The model for spruce estimated using the cone calorimeter measurements is employed in predicting heat release rates in an ISO 9705 room corner test~\cite{Sundstrom:1998}, and in a modified room corner test~\cite{Hietaniemi:2001} (in Finnish, English description of the test available in~\cite{Hietaniemi:1}). The selected test for simulation from~\cite{Sundstrom:1998} is M12, where the walls and ceiling of the test compartment is lined with 10~mm thick spruce timber. In the modified room corner test~\cite{Hietaniemi:2001}, the back wall opposite to the door opening, 240~cm length of an adjacent side wall, and a triangle shaped section of the ceiling connecting the two, are lined with 22~mm thick spruce timber. The gas burner is located in the timber-lined corner. All the other surfaces in the modified test, and the floor in M12~\cite{Sundstrom:1998} test are of concrete, as are the backing surfaces for timber.
 
-For simulations of both room corner tests~\cite{Sundstrom:1998,Hietaniemi:2001}, concrete properties are assumed as given for lightweight concrete in~\cite{Hietaniemi:2001}: thickness of 20~cm, thermal conductivity of 0.1~\si{W/(m.K)} and thermal diffusivity of 2 \times 10^{-7} m$^2$/s. Assuming a specific heat of 0.88~\si{kJ/(kg.K)} for concrete~\cite{Drysdale:2011}, gives a density of 568~kg/m$^3$ from thermal diffusivity.
+For simulations of both room corner tests~\cite{Sundstrom:1998,Hietaniemi:2001}, concrete properties are assumed as given for lightweight concrete in~\cite{Hietaniemi:2001}: thickness of 20~cm, thermal conductivity of 0.1~\si{W/(m.K)} and thermal diffusivity of 2 $\times$ 10$^{-7}$ m$^2$/s. Assuming a specific heat of 0.88~\si{kJ/(kg.K)} for concrete~\cite{Drysdale:2011}, gives a density of 568~kg/m$^3$ from thermal diffusivity.
 
 Figure~\ref{Aalto_Woods_RCT} shows heat release rates in room corner test M12 and in the modified room corner test. The burner output of 100~kW is reduced from both the experimental and simulation data, thus the figure shows only the heat release contribution from burning timber.