E_COEFFICIENT

[martuf97]

Hi all, i m working with the parameter E_COEFFICIENT to fire suppression. I noted that it is not woriking very well. Sometimes it seems, if the space is very confined that there are no suppression of the HRR curve. Any ideas?

[drjfloyd]

E_COEFFICIENT is a purely empiirical model that just relies on how much water is reaching the burning surface. Do you have enough grid resolution or the appropriate sprinkler spray pattern defintion for the confined space?

[martuf97]

got it i dont know what is the problem i'm running a lot of case but what ì ve noticed is that water doplets are not affecting the HRR at all.

[drjfloyd]

Are the droplets reaching the surface or do you have a spray pattern where the spray is just being directed to the walls? There are outputs for the mass for particles on solid surfaces.

We would need an example input file (as simple as possible while still demosntrating your problem) to provide more definitive support. But first make sure you have run a case with sufficient outputs that you have the data needed to try and assess on your own what is happening in the simulation.

[martuf97]

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//&MISC PARTICLE_CFL=T/

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&COMB EXTINCTION_MODEL='EXTINCTION 2'/

//&PRES VELOCITY_TOLERANCE=1.E-6, MAX_PRESSURE_ITERATIONS=100/

&TIME T_END=800.0 /

&MATL ID='CONCRETE',
SPECIFIC_HEAT=0.88,
CONDUCTIVITY=1.37,
DENSITY=2100.0,
EMISSIVITY=0.91/
&REAC ID='HEPTANE',
FUEL='N-HEPTANE',
CRITICAL_FLAME_TEMPERATURE=1497,
AUTO_IGNITION_TEMPERATURE=-273.,
AIT_EXCLUSION_ZONE=0.3,0.6,3.4,3.7,0.8,0.85
CO_YIELD=0.01,
SOOT_YIELD=0.037/

&MATL ID='liqHeptane',
SPECIFIC_HEAT=2.24,
CONDUCTIVITY=0.125,
DENSITY=678.0,
ABSORPTION_COEFFICIENT=301.0,
HEAT_OF_COMBUSTION=4.809E4,
HEAT_OF_REACTION=356.0,
SPEC_ID(1,1)='N-HEPTANE',
NU_SPEC(1,1)=1.0,
BOILING_TEMPERATURE=98.38/
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SPECIFIC_HEAT=0.465,
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//&INIT XB=0.0,7.3,3.2,4.0,0.0,8.0, AUTO_IGNITION_TEMPERATURE=-273. /

--&SPEC ID='WATER VAPOR SPK', SPEC_ID='WATER VAPOR'/
--&SPEC ID='WATER VAPOR'/

&SURF ID='BURNER', HRRPUA=531., TAU_Q=-300, COLOR='RED', E_COEFFICIENT=1 /

&SURF ID='CAR',
COLOR='WHITE',
BACKING='VOID',
MATL_ID(1,1)='STEEL',
MATL_MASS_FRACTION(1,1)=1.0,
THICKNESS(1)=0.05/

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MATL_MASS_FRACTION(1,1)=1.0,
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&DEVC ID='NOZ 8.2', XYZ=65.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='NOZ 9.1', XYZ=65.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='NOZ 9.2', XYZ=65.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='NOZ 10.1', XYZ=66.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='NOZ 10.2', XYZ=66.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='NOZ 11.1', XYZ=66.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='NOZ 11.2', XYZ=66.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 1.1', XYZ=67.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 1.2', XYZ=67.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 2.1', XYZ=67.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 2.2', XYZ=67.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 3.1', XYZ=68.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 3.2', XYZ=68.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 4.1', XYZ=68.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 4.2', XYZ=68.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 5.1', XYZ=69.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 5.2', XYZ=69.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 6.1', XYZ=69.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 6.2', XYZ=69.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 7.1', XYZ=70.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 7.2', XYZ=70.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 8.1', XYZ=70.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 8.2', XYZ=70.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 9.1', XYZ=71.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 9.2', XYZ=71.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&DEVC ID='2 NOZ 10.1', XYZ=71.5,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 10.2', XYZ=71.5,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 11.1', XYZ=72.0,1.5,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /
&DEVC ID='2 NOZ 11.2', XYZ=72.0,0.7,1.0, PROP_ID='Spr1', QUANTITY='CONTROL', CTRL_ID='controller 1', LATCH=.TRUE., ORIENTATION=0,0,-1, /

&SPEC ID='WATER VAPOR SPK', SPEC_ID='WATER VAPOR'/
&SPEC ID='WATER VAPOR'/

&PROP ID='Spr1', QUANTITY='SPRINKLER LINK TEMPERATURE', FLOW_RATE=0.094, PART_ID='water_drops', K_FACTOR=0.026, SPRAY_PATTERN_TABLE='TABLE1', PARTICLES_PER_SECOND=3000. /
&PART ID='water_drops', SPEC_ID='WATER VAPOR', SAMPLING_FACTOR=10, QUANTITIES='PARTICLE DIAMETER', DIAMETER= 27./

&TABL ID='TABLE1', TABLE_DATA=12.5,92.5,0.0,65.0,15.79,0.2/
&TABL ID='TABLE1', TABLE_DATA=12.5,92.5,72.0,137.0,15.79,0.2/
&TABL ID='TABLE1', TABLE_DATA=12.5,92.5,144.0,209.0,15.79,0.2/
&TABL ID='TABLE1', TABLE_DATA=12.5,92.5,216.0,281.0,15.79,0.2/
&TABL ID='TABLE1', TABLE_DATA=12.5,92.5,288.0,353.0,15.79,0.2/

&SLCF QUANTITY='VOLUME FRACTION', SPEC_ID='WATER VAPOR', PBY=3.4/
&SLCF QUANTITY='VOLUME FRACTION', SPEC_ID='WATER VAPOR SPK', PBY=3.4/
&SLCF PBY=3.4, QUANTITY='oxygen' /

&DEVC XYZ=0.1,0.1,0.1, ID='clock 1', QUANTITY='TIME'/

&CTRL ID='controller 1', FUNCTION_TYPE='CUSTOM', INPUT_ID='clock 1', RAMP_ID='ramp 1', LATCH=.FALSE. /

&RAMP ID='ramp 1', T= 0.00, F=-1. /
&RAMP ID='ramp 1', T= 99.00, F=-1. /
&RAMP ID='ramp 1', T= 100.00, F=1. / da verificare se usare questo o la stringa successiva
==&CTRL ID='controller 1', FUNCTION_TYPE='DEADBAND', SETPOINT=23.0,84.0, ON_BOUND='UPPER', LATCH=.FALSE., INPUT_ID='temp37'/

&BNDF QUANTITY='RADIATIVE HEAT FLUX' /
&BNDF QUANTITY='CONVECTIVE HEAT FLUX' /

&DEVC XB=0.0,1.0,0.0,1.0,0.0,1.0, QUANTITY='HRRPUV', ID='HRR_1', SPATIAL_STATISTIC='VOLUME INTEGRAL' /

&TAIL /

[drjfloyd]

This case has no outpts for how much water is on the surface. I asked that before you submit a case that you make the attempt to acertain that you actually have enough water hitting the surface for E_COEFFICIENT to have an effect.

[martuf97]

tunnel_hrr.csv