FDS Source: Issue #13717. Improve muli-species gas transport

Source/init.f90

@@ -4768,21 +4768,20 @@ SUBROUTINE CREATE_OR_REMOVE_OBST(NM,I1,I2,J1,J2,K1,K2,CR_INDEX,OBST_INDEX)
 
 IF (I1/=I2 .AND. J1/=J2 .AND. K1/=K2) CALL BLOCK_CELL(NM,I1+1,I2,J1+1,J2,K1+1,K2,CR_INDEX,OBST_INDEX)
 
-! If the OBSTruction is to be removed, set density and mass fractions to ambient value
-
-IF (REMOVE) THEN
-   DO K=K1+1,K2
-      DO J=J1+1,J2
-         DO I=I1+1,I2
-            RHOS(I,J,K) = RHO_0(K)
-            RHO(I,J,K)  = RHO_0(K)
-            IF (SOLID_PHASE_ONLY) TMP(I,J,K) = TMP_0(K)
-            ZZ(I,J,K,1:N_TRACKED_SPECIES)  = SPECIES_MIXTURE(1:N_TRACKED_SPECIES)%ZZ0
-            ZZS(I,J,K,1:N_TRACKED_SPECIES) = SPECIES_MIXTURE(1:N_TRACKED_SPECIES)%ZZ0
-         ENDDO
+! Set density, mass fractions, temperature, and net diffusion to ambient value in cells covered or uncovered by obstruction.
+
+DO K=K1+1,K2
+   DO J=J1+1,J2
+      DO I=I1+1,I2
+         RHOS(I,J,K) = RHO_0(K)
+         RHO(I,J,K)  = RHO_0(K)
+         IF (SOLID_PHASE_ONLY) TMP(I,J,K) = TMP_0(K)
+         ZZ(I,J,K,1:N_TRACKED_SPECIES)  = SPECIES_MIXTURE(1:N_TRACKED_SPECIES)%ZZ0
+         ZZS(I,J,K,1:N_TRACKED_SPECIES) = SPECIES_MIXTURE(1:N_TRACKED_SPECIES)%ZZ0
+         IF (I1==0.OR.I2==IBAR.OR.J1==0.OR.J2==JBAR.OR.K1==0.OR.K2==KBAR) DEL_RHO_D_DEL_Z(I,J,K,:) = 0._EB
       ENDDO
    ENDDO
-ENDIF
+ENDDO
 
 END SUBROUTINE CREATE_OR_REMOVE_OBST
 

Utilities/Matlab/FDS_verification_dataplot_inputs.csv

@@ -467,7 +467,7 @@ d,ns2d_32_nupt1,NS_Analytical_Solution/ns2d_32_nupt1_git.txt,NS_Analytical_Solut
 d,ns2d_64_nupt1,NS_Analytical_Solution/ns2d_64_nupt1_git.txt,NS_Analytical_Solution/ns2d_64_nupt1_exact.csv,1,2,Time,u-vel,Analytical (u-vel),k-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,NS_Analytical_Solution/ns2d_64_nupt1_devc.csv,2,3,Time,UVEL,FDS (UVEL),k--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Velocity (ns2d\_64\_nupt1),Time (s),Velocity (m/s),0,7,1,0.3,2.4,1,no,0.05 0.90,NorthEast,,1,linear,FDS_Verification_Guide/SCRIPT_FIGURES/ns2d_64_nupt1,Relative Error,mean,0.01,NS Analytical Solution,kd,k,TeX
 d,obst_activation,Pressure_Solver/obst_activation_ulmat_git.txt,Pressure_Solver/obst_activation_exact.csv,1,2,Time,D_max,Tolerance,k-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure_Solver/obst_activation_ulmat_devc.csv,2,3,Time,D_max,FDS (ULMAT),r--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Divergence (obst\_activation),Time (s),Divergence (1/s),0,2,1,1e-16,1e-13,1,no,0.05 0.90,SouthEast,,1,semilogy,FDS_Verification_Guide/SCRIPT_FIGURES/obst_activation,Absolute Error,max,1e-13,Pressure Solver,kd,k,TeX
 f,obst_activation,Pressure_Solver/obst_activation_default_git.txt,Pressure_Solver/obst_activation_exact.csv,1,2,Time,D_max,blank,blank,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure_Solver/obst_activation_default_devc.csv,2,3,Time,D_max,FDS (FFT),g--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Divergence (obst\_activation),Time (s),Divergence (1/s),0,2,1,1e-16,1e-13,1,no,0.05 0.90,SouthEast,,1,semilogy,FDS_Verification_Guide/SCRIPT_FIGURES/obst_activation,Absolute Error,max,1e-13,Pressure Solver,kd,k,TeX
-d,obst_activation,Pressure_Solver/obst_activation_default_gases_git.txt,Pressure_Solver/obst_activation_default_gases.csv,1,2,Time,T_min|T_max,Lower Bound|Upper Bound,k--|r--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure_Solver/obst_activation_default_gases_devc.csv,2,3,Time,T_min|T_max,T\_min|T\_max,k-|r-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Temperature (obst\_activation\_gases),Time (s),Temperature (°C),0,30,1,19.9,20.1,1,no,0.05 0.90,SouthEast,,1,linear,FDS_Verification_Guide/SCRIPT_FIGURES/obst_activation_gases,Absolute Error,max,1,Pressure Solver,kd,k,TeX
+d,obst_activation,Pressure_Solver/obst_activation_default_gases_git.txt,Pressure_Solver/obst_activation_default_gases.csv,1,2,Time,T_min|T_max,Lower Bound|Upper Bound,k--|r--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure_Solver/obst_activation_default_gases_devc.csv,2,3,Time,T_min|T_max,T\_min|T\_max,k-|r-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Temperature (obst\_activation\_default\_gases),Time (s),Temperature (°C),0,30,1,19.99,20.01,1,no,0.05 0.90,SouthEast,,1,linear,FDS_Verification_Guide/SCRIPT_FIGURES/obst_activation_gases,Absolute Error,max,0.005,Pressure Solver,kd,k,TeX
 d,obst_coarse_fine_interface,Pressure_Effects/obst_coarse_fine_interface_git.txt,Pressure_Effects/obst_coarse_fine_interface_exact.csv,1,2,Time,DP,Analytical (DP),k-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure_Effects/obst_coarse_fine_interface_devc.csv,2,3,Time,DP,FDS (DP),k--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Background Pressure (obst\_coarse\_fine\_interface),Time (s),Pressure (Pa),0,10,1,-10,10,1,no,0.05 0.90,NorthEast,,1,linear,FDS_User_Guide/SCRIPT_FIGURES/obst_coarse_fine_interface,Absolute Error,end,2,Pressure Effects,kd,k,TeX
 d,opening_ulmat,Pressure_Solver/opening_ulmat_git.txt,Pressure_Solver/opening_pressure_error.csv,1,2,Time,Pressure Tolerance,Ideal (Pressure Tolerance),ko--,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure_Solver/opening_ulmat_devc.csv,2,3,Time,perr-max,FDS (p err max),k-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure Error (opening\_ulmat),Time (s),Pressure Error (Pa),0,10,1,0,1.00E-06,1,no,0.05 0.90,SouthEast,,1,semilogy,FDS_User_Guide/SCRIPT_FIGURES/opening_ulmat,Absolute Error,tolerance,1.00E-10,Pressure Solver,k+,k,TeX
 d,parabolic_profile,Flowfields/parabolic_profile_git.txt,Flowfields/parabolic_profile.csv,1,2,Time,Pressure,Exact (Pressure),ko,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Flowfields/parabolic_profile_devc.csv,2,3,Time,pres,FDS (pres),k-,0,100000,,0,100000,-1.00E+09,1.00E+09,0,Pressure (parabolic\_profile),Time (s),Pressure (Pa),0,60,1,0,2500,1,no,0.05 0.90,SouthEast,,1,linear,FDS_User_Guide/SCRIPT_FIGURES/parabolic_profile,Relative Error,end,0.01,Pressure Effects,k+,k,TeX

Verification/Pressure_Solver/obst_activation_default_gases.csv

@@ -1,3 +1,3 @@
 Time,T_min,T_max
- 0,19.95,20.05
-30,19.95,20.05
+ 0,19.995,20.005
+30,19.995,20.005