FDS Validation: use ULMAT to avoid instability in BRE case

Author: rmcdermo

Validation/UMD_Burning_Rate_Emulator/FDS_Input_Files/BRE25_Test_18_1mm.fds

@@ -18,6 +18,8 @@
 &MISC SIMULATION_MODE='LES', GVEC(3)=0., P_INF=101325, STRATIFICATION=F
       Y_O2_INFTY=0.2329, Y_CO2_INFTY=0., HUMIDITY=0., TMPA=25, CONSTANT_SPECIFIC_HEAT_RATIO=F/
 
+&PRES SOLVER='ULMAT HYPRE', MAX_PRESSURE_ITERATIONS=1/
+
 &COMB SUPPRESSION=F /
 
 &RADI RADIATION=T /