flacs-fire - gexcon jet utility able-noble ewan & moodie. ... pseudo source models ......

FLACS User Group Meeting 31 May – 1 June 2016 Bergen Norway

FLACS-FireValidation and further development

Djurre Siccama

Gexcon


►Customers

►Developments last year

►Validation H2 Jet fires

►Future developments FLACS-Fire

Outline


► Currently 14+ FLACS-Fire customers

► Overal feedback is very positive

Customers


► Partial porosities

► Work on hydrogen jet fires

► Improvements of Convective radation in monitor points

► Recommendations on pseudo-component for pool fire mixtures

► Recommendations and validation for trench fires

► Validation and working on user validation report

► Supporting various FLACS-Fire users

► Two family extentions in the Fire development team

FLACS-Fire Developments last year


► Burns quickly

► Low radiant heat

► Almost invisible

► Radiative properties

Validation of H2 Jet fires


► Fuel = H2

► Tank Pressure = 104.8 bar

► Tank Temperature = 231.4 K

► Jet Direction = Vertical

► Nozzle Diameter = 5.08 mm

► Wind speed = 0 m/s

► Ambient Temperature = 293 K

Case A: Vertical H2 Jet fire

Schefer et al. 2007


► No of Grid: 353,495

► Pseudo source models:

1. Jet Utility

2. Albe-Noble

3. Ewan & Moodie

Case A: Sensitivity study (1)


► Flame shape and Temperature

Case A: Sensitivity study (2)

ExperimentFLACS-Fire

Jet Utility Able-Noble Ewan & Moodie


Case A: Sensitivity study (4)Jet Utility Able-Noble Ewan & Moodie

Radiometer FLACS-Fire

Jet Utility

FLACS-Fire

Albe-noble

FLACS-Fire

Ewan-moodie

R-1 11.5 11.0 10.9

R-2 8.8 7.9 8.1

R-3 6.2 7.7 5.7

R-4 5.7 5.8 4.8


► Fuel = H2



► Jet Direction = Horizontal


► Wind speed = 2.84 m/s


► Angle between wind and jet =1.5°

Case B: Horizontal H2 Jet fire (1)

Ekoto et al. 2012


► Fuel = H2




Standard k-Ɛ

constants

modified k-Ɛ

constants


► Fuel = H2





► Wind speed = 0.83 m/s


► Angle between wind and jet =33°

Case C: Large Horizontal H2 Jet fire (1)

Experim

ent


Case C: Large Horizontal H2 Jet fire (2)

Experiment

FLACS-Fire


► Fuel = H2

► Tank Pressure = 100 bar



► Nozzle Diameter = 3 mm

Case D: Horizontal H2 Jet dispersion (1)


Case D: Horizontal H2 Jet dispersion (2)

Albe-Noble

Jet utility


► Grid

► Point jet Leak / Area Leak

► Extinction

► Fire switch

► Pseudo source models

► Gravity constant

► Compressible/ Incompressible

► RELATIVE_TURBULENCE_INTENSITY

► TURBULENCE_LENGTH_SCALE

► Ground roughness

► Reference height

► Turbulence generation due to buoyancy – Max, Rodi model

► TIMEORDER

► Turbulence constants

Additional sensitivities


► Performance of vertical Hydrogen jet fires is good to very good

► Performance of horizontal Hydrogen jet fires is not yet sufficiently

accurate

► Underlying cause still not identified

► Further investigation needed

Conclusion validation of H2 Jet fires


► Validation report

► Statoil approval process

► User friendliness

► Simplify DTM buffer settings

► Improve pool fire guidelines

► Speed and robustness

► Time dependent and user customisable DTM frequency

► Calculate DTM on limited domain and/or far field radiation model

► Parallel solver?

► Improved modelling

► Improved support for partial porosity

► 3D radiation output (Currently only in monitor points)

► Interfacing with structural response software (FEA)

► Fire Deluge

Planned developments FLACS-Fire


Questions?

flacs-fire - gexcon jet utility able-noble ewan & moodie. ... pseudo source models ......

Documents