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firemodels / cfast

Consolidated Model of Fire and Smoke Transport
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Beginner's question #2123

Closed Ronnie-Henry closed 1 month ago

Ronnie-Henry commented 4 months ago

Hello everyone, I would like to ask you a basic question. How do I put a table (that will start the fire) in the program? Could you recommend some literature?

mcgratta commented 4 months ago

You do not add a table explicitly, but rather the heat release rate time history of the table.

tGagnonCorvid commented 3 months ago

If you want to specify fires outside of the CEdit interface you could manually or with the help of a script generate each data point for the HRR curve and import that as a cfast.in file.

For example, the following text within a *.in file was generated by a python script of mine to approximate a fuel pool fire

!! Fires &FIRE ID = 'FIRE_COMP1005_FVC16' COMP_ID = '1005', FIRE_ID = 'FIRE_FVC16_8MW_Oil_L' LOCATION = 0.5, 0.5 IGNITION_CRITERION = 'TIME', SETPOINT = 0 / &CHEM ID = 'FIRE_FVC16_8MW_Oil_L' CARBON = 1 CHLORINE = 0 HYDROGEN = 1 NITROGEN = 0 OXYGEN = 0 HEAT_OF_COMBUSTION = 46000 RADIATIVE_FRACTION = 0.2051 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L' LABELS = 'TIME', 'HRR', 'HEIGHT', 'AREA', 'CO_YIELD', 'SOOT_YIELD', 'HCN_YIELD', 'HCL_YIELD', 'TRACE_YIELD' / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 0.0, 0, 0, 0.0, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 25.0, 8286, 0, 6.3, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 50.0, 6290, 0, 5.0, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 75.0, 4532, 0, 3.8, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 100.0, 3302, 0, 2.9, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 125.0, 2435, 0, 2.3, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 150.0, 1820, 0, 1.8, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 175.0, 1378, 0, 1.5, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 200.0, 1058, 0, 1.2, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 225.0, 822, 0, 1.0, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 250.0, 647, 0, 0.8, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 275.0, 516, 0, 0.7, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 300.0, 415, 0, 0.6, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 325.0, 338, 0, 0.5, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 350.0, 278, 0, 0.4, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 375.0, 230, 0, 0.4, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 400.0, 193, 0, 0.3, 0, 0, 0, 0, 0 / &TABL ID = 'FIRE_FVC16_8MW_Oil_L', DATA = 800.0, 193, 0, 0.3, 0, 0, 0, 0, 0 /

It is a pretty simple exercise to format the output of time history data for CFAST with something such as a python script.