FDS Verification: set 0 K ambient for rad cases that are assuming it in the exact calc.

Author: drjfloyd

Manuals/FDS_Verification_Guide/FDS_Verification_Guide.tex

@@ -3307,7 +3307,7 @@ \section{Radiation Shield (\texorpdfstring{\ct{radiation_shield}}{radiation_shie
 \section{Radiation from a gas-fired panel (\texorpdfstring{\ct{radiation_gas_panel}}{radiation_gas_panel}) }
 \label{radiation_gas_panel}
 
-A gas-fired panel is often used as a source of thermal radiation in laboratory experiments.  Here, the heat flux from an $h=30.48$~cm square panel is computed at distances of 10~cm, 15~cm, 25~cm, 38~cm, 46~cm, 61~cm, and 76~cm along its perpendicular center axis, and along a perpendicular line that is displaced laterally 14~cm and vertically 14~cm from the center axis, as illustrated in Fig.~\ref{radiation_gas_panel_plot}.  We compare the results computed by FDS to those calculated using configuration factors. The temperature and emissivity of the panel are set to 1250~K and 0.7, respectively, and the ambient temperature is 273~K.
+A gas-fired panel is often used as a source of thermal radiation in laboratory experiments.  Here, the heat flux from an $h=30.48$~cm square panel is computed at distances of 10~cm, 15~cm, 25~cm, 38~cm, 46~cm, 61~cm, and 76~cm along its perpendicular center axis, and along a perpendicular line that is displaced laterally 14~cm and vertically 14~cm from the center axis, as illustrated in Fig.~\ref{radiation_gas_panel_plot}.  We compare the results computed by FDS to those calculated using configuration factors. The temperature and emissivity of the panel are set to 1250~K and 0.7, respectively, and the ambient temperature is 0~K.
 
 The configuration factor, $\d F_{2 \rightarrow 1}$, describing the energy exchange between the radiant panel and a target with differential area $\d A_1$ located on a perpendicular line extending from the panel at the point  $(\overline{x}, \overline{y})$ is computed from the following:
 \begin{align}

Verification/Radiation/geom_rad.fds

@@ -10,6 +10,8 @@
 
 &TIME T_END=2 /
 
+&MISC TMPA=-273.14/
+
 &SPEC ID='NITROGEN', BACKGROUND=.TRUE./
 
 &RADI NUMBER_RADIATION_ANGLES=400 /

Verification/Radiation/geom_rad_2.fds

@@ -15,6 +15,8 @@
 
 &TIME T_END=2 /
 
+&MISC TMPA=-273.14/
+
 &SPEC ID='NITROGEN', BACKGROUND=.TRUE./
 
 &RADI NUMBER_RADIATION_ANGLES=400 /

Verification/Radiation/plate_view_factor_2D_100.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 105.34 kW/m2
 
 &MESH IJK=20,1,10, XB=0,2,-.5,.5,0,1 /
 
-&TIME T_END=.1 DT = 0.001 / 
+&TIME T_END=.1 DT = 0.001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/
 
 &RADI NUMBER_RADIATION_ANGLES = 100 /
 

Verification/Radiation/plate_view_factor_2D_30.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 105.34 kW/m2
 
 &MESH IJK=20,1,10, XB=0,2,-.5,.5,0,1 /
 
-&TIME T_END=.1 DT = 0.001 / 
+&TIME T_END=.1 DT = 0.001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/
 
 &RADI NUMBER_RADIATION_ANGLES = 30 /
 

Verification/Radiation/plate_view_factor_2D_60.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 105.34 kW/m2
 
 &MESH IJK=20,1,10, XB=0,2,-.5,.5,0,1 /
 
-&TIME T_END=.1 DT = 0.001 / 
+&TIME T_END=.1 DT = 0.001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/
 
 &RADI NUMBER_RADIATION_ANGLES = 60 /
 

Verification/Radiation/plate_view_factor_cart_100.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 81.8 kW/m2.
 
 &MESH IJK=20,20,10, XB=0,2,0,2,0,1 /
 
-&TIME T_END=.01 DT = 0.001 / 
+&TIME T_END=.01 DT = 0.001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/
 
 
 

Verification/Radiation/plate_view_factor_cart_30.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 81.8 kW/m2.
 
 &MESH IJK=20,20,10, XB=0,2,0,2,0,1 /
 
-&TIME T_END=.01 DT = 0.001 / 
+&TIME T_END=.01 DT = 0.001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/
 
 &RADI NUMBER_RADIATION_ANGLES = 30 /
 

Verification/Radiation/plate_view_factor_cart_60.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 81.8 kW/m2.
 
 &MESH IJK=20,20,10, XB=0,2,0,2,0,1 /
 
-&TIME T_END=.01 DT = 0.001 / 
+&TIME T_END=.01 DT = 0.001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/
 
 &RADI NUMBER_RADIATION_ANGLES = 60 /
 

Verification/Radiation/plate_view_factor_cyl_100.fds

@@ -4,9 +4,9 @@ The RADIATIVE HEAT FLUX should be 74.1 kW/m2
 
 &MESH IJK=10,1,10, XB=0.0,3.0,-.5,.5,0.0,3.0 CYLINDRICAL = .TRUE. /
 
-&TIME T_END=.1 DT = 0.0001 / 
+&TIME T_END=.1 DT = 0.0001 /
 
-&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0./ 
+&MISC GVEC=0,0,0,Y_CO2_INFTY=0.,HUMIDITY=0.,TMPA=-273.14/