FDS Source: Streamline CONNECTED_ZONES calcs

Author: mcgratta

Source/cons.f90

@@ -235,7 +235,7 @@ MODULE GLOBAL_CONSTANTS
 LOGICAL :: SPEC_RESTART=.FALSE.             !< Initialize tracked species field with values from a file
 LOGICAL :: PARTICLE_CFL=.FALSE.             !< Include particle velocity as a constraint on time step
 LOGICAL :: RTE_SOURCE_CORRECTION=.TRUE.     !< Apply a correction to the radiation source term to achieve desired rad fraction
-LOGICAL :: OBST_CREATED_OR_REMOVED=.FALSE.  !< An obstruction has just been created or removed and wall cells must be reassigned
+LOGICAL :: OBST_CREATED_OR_REMOVED=.TRUE.   !< An obstruction has just been created or removed and wall cells must be reassigned
 LOGICAL :: CHECK_REALIZABILITY=.FALSE.
 LOGICAL :: MIN_DEVICES_EXIST=.FALSE.
 LOGICAL :: MAX_DEVICES_EXIST=.FALSE.
@@ -536,7 +536,7 @@ MODULE GLOBAL_CONSTANTS
 
 ! Miscellaneous integer constants
 
-INTEGER :: ICYC,ICYC_RESTART=0,NFRAMES,PERIODIC_TEST=0,SIM_MODE=3,TURB_MODEL=0,FISHPAK_BC(3)=-1,&
+INTEGER :: ICYC,NFRAMES,PERIODIC_TEST=0,SIM_MODE=3,TURB_MODEL=0,FISHPAK_BC(3)=-1,&
            STOP_AT_ITER=0,WALL_INCREMENT=2,WALL_COUNTER=0,&
            CLIP_DT_RESTRICTIONS_MAX=5,BNDF_TIME_INTEGRALS=0
 

Source/divg.f90

@@ -85,7 +85,7 @@ SUBROUTINE DIVERGENCE_PART_1(T,DT,NM)
 
 ! Determine if pressure ZONEs have merged
 
-IF (N_ZONE>0) CALL MERGE_PRESSURE_ZONES
+IF (N_ZONE>0 .AND. OBST_CREATED_OR_REMOVED) CALL MERGE_PRESSURE_ZONES
 
 ! Compute normal component of velocity at boundaries, U_NORMAL_S in the PREDICTOR step, U_NORMAL in the CORRECTOR.
 

Source/main.f90

@@ -390,7 +390,6 @@ PROGRAM FDS
 ! Potentially read data from a previous calculation
 
 IF (RESTART) THEN
-   ICYC_RESTART=1
    DO NM=LOWER_MESH_INDEX,UPPER_MESH_INDEX
       CALL READ_RESTART(T,DT,NM)
    ENDDO
@@ -437,14 +436,6 @@ PROGRAM FDS
 
 ENDIF
 
-! Compute divergence just in case the flow field is not initialized to ambient
-
-CALL INITIALIZE_DIVERGENCE_INTEGRALS
-
-DO NM=LOWER_MESH_INDEX,UPPER_MESH_INDEX
-   CALL DIVERGENCE_PART_1(T_BEGIN,DT,NM)
-ENDDO
-
 ! Initialize particle distributions
 
 CALL GENERATE_PARTICLE_DISTRIBUTIONS
@@ -511,10 +502,6 @@ PROGRAM FDS
    IF (MY_RANK==0 .AND. VERBOSE) CALL VERBOSE_PRINTOUT('Completed DUMP_MESH_OUTPUTS')
 ENDIF
 
-! If there are zones and HVAC pass PSUM
-
-IF (HVAC_SOLVE .AND. N_ZONE>0 .AND. .NOT.SOLID_PHASE_ONLY) CALL EXCHANGE_DIVERGENCE_INFO
-
 ! Make an initial dump of global output quantities
 
 IF (.NOT.RESTART) THEN
@@ -527,6 +514,18 @@ PROGRAM FDS
 
 IF (.NOT.RESTART) CALL CREATE_OR_REMOVE_OBSTRUCTIONS
 
+! Compute divergence just in case the flow field is not initialized to ambient
+
+CALL INITIALIZE_DIVERGENCE_INTEGRALS
+
+DO NM=LOWER_MESH_INDEX,UPPER_MESH_INDEX
+   CALL DIVERGENCE_PART_1(T_BEGIN,DT,NM)
+ENDDO
+
+IF (HVAC_SOLVE .AND. N_ZONE>0 .AND. .NOT.SOLID_PHASE_ONLY) CALL EXCHANGE_DIVERGENCE_INFO
+
+CALL GLOBAL_MATRIX_REASSIGN
+
 ! Write out character strings to .smv file
 
 CALL WRITE_STRINGS
@@ -685,10 +684,6 @@ PROGRAM FDS
 
       IF (N_ZONE>0 .AND. .NOT.SOLID_PHASE_ONLY) CALL EXCHANGE_DIVERGENCE_INFO
 
-      ! Update global pressure matrices after zone connections
-
-      IF ((ICYC==1 .OR. ICYC_RESTART==1) .AND. FIRST_PASS) CALL GLOBAL_MATRIX_REASSIGN
-
       ! Finish the divergence calculation
 
       FINISH_DIVERGENCE_LOOP: DO NM=LOWER_MESH_INDEX,UPPER_MESH_INDEX
@@ -1620,7 +1615,7 @@ END SUBROUTINE CREATE_OR_REMOVE_OBSTRUCTIONS
 
 SUBROUTINE GLOBAL_MATRIX_REASSIGN
 
-IF (OBST_CREATED_OR_REMOVED .OR. ICYC_RESTART==1) THEN
+IF (OBST_CREATED_OR_REMOVED .OR. ICYC==1) THEN
    SELECT CASE (PRES_FLAG)
       CASE (ULMAT_FLAG)
          DO NM=LOWER_MESH_INDEX,UPPER_MESH_INDEX
@@ -1638,7 +1633,6 @@ SUBROUTINE GLOBAL_MATRIX_REASSIGN
          CALL STOP_CHECK(1)
    END SELECT
    OBST_CREATED_OR_REMOVED = .FALSE.
-   ICYC_RESTART=0
 ENDIF
 
 END SUBROUTINE GLOBAL_MATRIX_REASSIGN
@@ -1808,10 +1802,18 @@ END SUBROUTINE END_FDS
 
 SUBROUTINE INITIALIZE_DIVERGENCE_INTEGRALS
 
+INTEGER :: IPZ
+
 USUM = 0._EB
 PSUM = 0._EB
 DSUM = 0._EB
-CONNECTED_ZONES = .FALSE.
+
+IF (OBST_CREATED_OR_REMOVED) THEN
+   CONNECTED_ZONES = .FALSE.
+   DO IPZ=0,N_ZONE
+      CONNECTED_ZONES(IPZ,IPZ) = .TRUE.
+   ENDDO
+ENDIF
 
 END SUBROUTINE INITIALIZE_DIVERGENCE_INTEGRALS
 
@@ -1821,13 +1823,12 @@ END SUBROUTINE INITIALIZE_DIVERGENCE_INTEGRALS
 
 SUBROUTINE EXCHANGE_DIVERGENCE_INFO
 
-INTEGER :: IPZ,IOPZ,IOPZ2
+INTEGER :: IPZ
 REAL(EB) :: TNOW
-LOGICAL :: NEW_CONNECTION
 
 TNOW = CURRENT_TIME()
 
-! Sum up the divergence integrals over the MPI processes
+! Sum up the divergence integrals and zone connection matrix over the MPI processes
 
 IF (N_MPI_PROCESSES>1) THEN
    CALL MPI_ALLREDUCE(MPI_IN_PLACE,DSUM,N_ZONE,MPI_DOUBLE_PRECISION,MPI_SUM,MPI_COMM_WORLD,IERR)
@@ -1838,25 +1839,11 @@ SUBROUTINE EXCHANGE_DIVERGENCE_INFO
 
 ! Connect zones to others which are not directly connected
 
-NEW_CONNECTION = .TRUE.
-DO WHILE (NEW_CONNECTION)
-   NEW_CONNECTION = .FALSE.
+IF (OBST_CREATED_OR_REMOVED) THEN
    DO IPZ=1,N_ZONE
-      DO IOPZ=1,N_ZONE
-         IF (IOPZ==IPZ) CYCLE
-         IF (CONNECTED_ZONES(IPZ,IOPZ)) THEN
-            DO IOPZ2=0,N_ZONE
-               IF (IOPZ==IOPZ2) CYCLE
-               IF (CONNECTED_ZONES(IOPZ,IOPZ2)) THEN
-                  IF (.NOT.CONNECTED_ZONES(IPZ,IOPZ2)) NEW_CONNECTION = .TRUE.
-                  CONNECTED_ZONES(IPZ,IOPZ2) = .TRUE.
-                  CONNECTED_ZONES(IOPZ2,IPZ) = .TRUE.
-               ENDIF
-            ENDDO
-         ENDIF
-      ENDDO
+      CONNECTED_ZONES = MATMUL(CONNECTED_ZONES,CONNECTED_ZONES)
    ENDDO
-ENDDO
+ENDIF
 
 T_USED(11)=T_USED(11) + CURRENT_TIME() - TNOW
 END SUBROUTINE EXCHANGE_DIVERGENCE_INFO