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FDS Source: Iterate BI-DIR for dynamic calibration #15717

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drjfloyd merged 1 commit into from
Dec 14, 2025
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FDS Source: Iterate BI-DIR for dynamic calibration #15717

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14 changes: 10 additions & 4 deletions Source/dump.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -7926,10 +7926,16 @@ REAL(EB) RECURSIVE FUNCTION GAS_PHASE_OUTPUT(T,DT,NM,II,JJ,KK,IND,IND2,Y_INDEX,Z
! LJ AIR viscosity fit 100 K to 5000 K
MU_G = 1.5205E-22_EB*PROBE_TMP**5 - 2.1417E-18_EB*PROBE_TMP**4 + 1.1402E-14_EB*PROBE_TMP**3 - &
2.9846E-11_EB*PROBE_TMP**2 + 5.9898E-8_EB*PROBE_TMP + 0.000002352_EB
RE_D = MIN(3800._EB,MAX(40._EB,PROBE_RHO*VEL*PY%PROBE_DIAMETER/MU_G))
FAC = 1.533_EB-0.001366_EB*RE_D+0.000001688_EB*RE_D**2-0.0000000009706_EB*RE_D**3+&
0.0000000000002555_EB*RE_D**4-2.484E-17_EB*RE_D**5
GAS_PHASE_OUTPUT_RES = SIGN(1._EB,COSTHETA)*1._EB/FAC*SQRT(2*PROBE_DELTA_P/PROBE_RHO)
JJJ = 1
BP_LOOP: DO
RE_D = MIN(3800._EB,MAX(40._EB,PROBE_RHO*VEL*PY%PROBE_DIAMETER/MU_G))
FAC = 1.533_EB-0.001366_EB*RE_D+0.000001688_EB*RE_D**2-0.0000000009706_EB*RE_D**3+&
0.0000000000002555_EB*RE_D**4-2.484E-17_EB*RE_D**5
GAS_PHASE_OUTPUT_RES = SIGN(1._EB,COSTHETA)*1._EB/FAC*SQRT(2._EB*PROBE_DELTA_P/PROBE_RHO)
IF (JJJ > 9 .OR. ABS(VEL-GAS_PHASE_OUTPUT_RES)/(GAS_PHASE_OUTPUT_RES+TWO_EPSILON_EB) < 0.001_EB) EXIT BP_LOOP
VEL = 0.2_EB*VEL+0.8_EB*GAS_PHASE_OUTPUT_RES
JJJ = JJJ + 1
ENDDO BP_LOOP
ENDIF

CASE(130) ! EXTINCTION
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