From c0e9d6e1f90fc6c260a77cf5907cc94a9d207cc7 Mon Sep 17 00:00:00 2001
From: rmcdermo <randy.mcdermott@gmail.com>
Date: Wed, 6 Aug 2025 14:25:41 -0400
Subject: [PATCH] FDS Validation: use ULMAT to avoid instability in BRE case

---
 .../FDS_Input_Files/BRE25_Test_18_1mm.fds                       | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Validation/UMD_Burning_Rate_Emulator/FDS_Input_Files/BRE25_Test_18_1mm.fds b/Validation/UMD_Burning_Rate_Emulator/FDS_Input_Files/BRE25_Test_18_1mm.fds
index 2ae3c982a65..56d7cc3a8fb 100644
--- a/Validation/UMD_Burning_Rate_Emulator/FDS_Input_Files/BRE25_Test_18_1mm.fds
+++ b/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 /