Skip to content

FDS Source: reformulate UGENT VARIABLE_CFT #16245

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
rmcdermo merged 1 commit into from
May 8, 2026
+4 −2
Merged

FDS Source: reformulate UGENT VARIABLE_CFT #16245

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 4 additions & 2 deletions Source/fire.f90
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1422,10 +1422,11 @@ SUBROUTINE EXTINCT_2(EXTINCT,ZZ_0,ZZ_IN,TMP_IN,TAU_MIX)
USE PHYSICAL_FUNCTIONS, ONLY: GET_ENTHALPY
REAL(EB),INTENT(IN) :: TMP_IN,ZZ_IN(1:N_TRACKED_SPECIES),ZZ_0(1:N_TRACKED_SPECIES),TAU_MIX
LOGICAL, INTENT(INOUT) :: EXTINCT
REAL(EB) :: ZZ_HAT_0(1:N_TRACKED_SPECIES),ZZ_HAT(1:N_TRACKED_SPECIES),H_0,H_CRIT,PHI_TILDE,CFT
REAL(EB) :: ZZ_HAT_0(1:N_TRACKED_SPECIES),ZZ_HAT(1:N_TRACKED_SPECIES),H_0,H_CRIT,PHI_TILDE,CFT,TMP_INF
INTEGER :: NS,NR
REAL(EB) :: SUM_ZZ,SUM_CFT
TYPE(REACTION_TYPE), POINTER :: RN,R1
REAL(EB), PARAMETER :: DELTA_TMP_INF=-425._EB, TMP_EXT_0 = 1700._EB, TAU_CHEM_LOC = 1.45E-3_EB

! Get the weighted average of the critical flame temperature (CFT) based on the relative amounts of fuels of the primary reactions

Expand All @@ -1444,7 +1445,8 @@ SUBROUTINE EXTINCT_2(EXTINCT,ZZ_0,ZZ_IN,TMP_IN,TAU_MIX)
ENDIF

IF (VARIABLE_CFT) THEN
CFT = 1522.1_EB*(1000._EB*TAU_MIX)**(-0.038_EB) ! Experimental mechanism, U of Ghent
TMP_INF = SUM_CFT/SUM_ZZ + DELTA_TMP_INF
CFT = TMP_INF + (TMP_EXT_0-TMP_INF)*EXP(-SQRT(TAU_MIX/TAU_CHEM_LOC)) ! Experimental mechanism, UGent
ELSE
CFT = SUM_CFT/SUM_ZZ
ENDIF
Expand Down
Loading