how to deifne parameters of Baker-strehlow model in PHAST 6.54?

[driftshade]

dear firiend,
could anyone know how to difine the deifne parameters of Baker-strehlow model in PHAST 6.54 in the explosion modeling of offshore platform.
project introduction
now i am conducnting a explosion modeling for a offshore unmanned platform(a oil/gas field),the platform is simple,with two levels,upper deck and lower deck,the elevation between lower deck and upper deck is 6m.there are two areas in the lower deck seperated by a A60 fire wall,west of the A60 wall is the wellhead area(11m lengh,and 22m width),with well slots(6 production well,3 water injection well),closed drain system,multiport selector valve,multiphase flow meter and pig laucher. the all the paltform is steel plate not grating.
the area is crowd,and with three walls confined.
so i choose the following parameter:
material reactivity: low
flame expansion:2D(the actual value may be between 1D to 2D)
obstacle density：high（it's absolutely above 40% obstacle ratio)
the earth reflection factor:1.8(VCE,1.7-2)
wheather :1.5F
flammable used to explosion:1Kg
the peak overpressure is abt 1bar
it's seems to0 high

i don't know weathe the parameter of flame expansion and obstacle density is right?
my core question:
1. when we define the obstacle density,is it the obstacle density engulfed by dispersion flammable cloud(between LFL and LFH) or the obstacle density of the area(seprated area by fire walls)

[driftshade]

pls. anyone know the answer.thanks.

[Dushmen]

So, if you have three walls confined and plated decks in your module, flame expansion should be 1D, i.e. flame expansion may occur only in 1 direction. Next, 1 kg of fuel - is about 1.4 m3 (for methane) and in some conditions you may see overpressure much more than 1 bar. For exact evaluation you should use real geometry and CFD simulators like FLACS.
About core question:
1. when we define the obstacle density,is it the obstacle density engulfed by dispersion flammable cloud (between LFL and LFH) or the obstacle density of the area (separated area by fire walls)
If you consider only explosion inside module (with no escalation through fire walls to other areas) the obstacle density should be assigned only for your module, not for area engulfed by dispersion flammable cloud(between LFL and LFH).

[safetyuser]

i don't know weathe the parameter of flame expansion and obstacle density is right?
my core question:
1. when we define the obstacle density,is it the obstacle density engulfed by dispersion flammable cloud(between LFL and LFH) or the obstacle density of the area(seprated area by fire walls)

should be the onstruction factor i.e. "the ratio of the volume of the obstructed area occupied by the obstacles and the total volume of the obstructed area itself"

cfr CPR14E "Yellow Book" by TNO and FIRES, EXPLOSIONS, AND TOXIC GAS DISPERSIONS - Effects Calculation and Risk Analysis by CRC press

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