Application of field modelling technique to simulate interaction of sprinkler and fire-induced smoke layer

Chow, Wan Ki; Fong, Nai Kong

doi:10.1080/00102209308924105

Cited by 28 publications

(11 citation statements)

References 42 publications

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“…Three sets of free boundary conditions were tested: -Free boundary condition FC1 [20]-The gradients for all the variables ø at the boundary were set to zero, i.e. the flow variable 0 at intersection of the ith and jth grid lines (denoted by 0(ij) as in Figure 1) was given by: …”

Section: The Three Sets Of Free Boundary Conditionsmentioning

confidence: 99%

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Free Boundary Conditions for Simulating Air Movement in a Big Hall Induced by a "Bare Cabin" Fire

Chow

Yin

1999

Journal of Fire Sciences

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Air movement in a big hall induced by a fire in a "bare cabin" was simulated using Computational Fluid Dynamics (CFD). Applying CFD in simulating fire-induced air flow in buildings would require specification of free boundary conditions. Improper description of the free boundary conditions would give very different results. Three free boundary conditions commonly used were tested.Three sets of big hall geometry including two bare cabin designs and five heat release rates of fire of 20 kW m -1 , 40 kW m -1 , 60 kW m -1 , 80 kW m -1 , and 100 kW m -1 were considered. The self-developed program CY-TEAM modified from TEAM was selected as the simulator. Further, the commercial software CFX4.2 was used to compare with part of the results predicted by CY-TEAM. This gave a total number of 60 simulations.Results predicted from all these different geometries, conditions and software were compared. It is concluded that the free boundary condition should be specified carefully in simulating fire-induced air flow with CFD.

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Section: The Three Sets Of Free Boundary Conditionsmentioning

confidence: 99%

“…Three free boundary conditions [20,21] commonly used in simulating a compartment fire were tested in this paper: Three free boundary conditions [20,21] commonly used in simulating a compartment fire were tested in this paper:…”

Section: Introductionmentioning

confidence: 99%

Free Boundary Conditions for Simulating Air Movement in a Big Hall Induced by a "Bare Cabin" Fire

Chow

Yin

1999

Journal of Fire Sciences

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“…OpenFOAM Ò was recently successfully used for the modeling of compressible flows using the PISO algorithms at any Mach number, e.g., see Xisto et al (2012) and Payri et al (2015). While the PISO approach was formulated for combustion processes (e.g., Issa et al, 1991;Chow and Fong, 1993) the application to the wide range of time and length scales relevant to aerosol formation pose new challenges to the PISO framework that are considered here. We integrate well-known Euler-Euler formulations for the aerosol component of the model and adopt in addition the MUSCL TVD scheme to handle unphysical oscillations that may arise near sharp nucleation fronts.…”

Section: Introductionmentioning

confidence: 99%

Extension of the compressible PISO algorithm to single-species aerosol formation and transport

Frederix

Stanić

Kuczaj

et al. 2015

International Journal of Multiphase Flow

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“…There had been lots of works on hollow-cone spray with large droplet discharged by sprinkler system. Other than experimental studies, the interaction of water spray with hot smoke layer has also been simulated using field models [6][7][8][9] and zone models [10][11][12][13][14][15]. Relatively, there are not so many works on solid-cone water sprays with small droplet discharged from WMFSS, apart from recent numerical simulations using zone models on both types of water sprays [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling for compartment fire environment under a solid-cone water spray

Yao

Chow

2006

Applied Mathematical Modelling

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A mathematical model was developed for simulating the fire environment of a compartment under the action of a solidcone water spray such as those discharged from a water mist fire suppression system. A smoke layer was induced by a fire in the compartment. The solid-cone water spray was discharged to act on the smoke layer, but not on the burning object. Under this condition of having a stable smoke layer, the compartment was divided into three regions. Region 1 is the upper hot smoke layer, Region 2 is the lower cool air layer and Region 3 is the solid-cone spray. The effects on the smoke layer development due to spray-induced flow were considered on the basis of mass, momentum and heat conservation. Water droplets of the solid-cone spray were divided into four typical classes based on the droplet distribution function.The parameters including the smoke layer interface height, smoke temperature and air temperature, smoke flow rate through the opening and oxygen concentration in the air layer were investigated under various heat release rates, water application rates and volume mean diameters of the solid-cone spray. Effective hot gas entrainment and water vapor production suggested that the water spray should contain a variety of droplet size. In this way, a compartment fire can be controlled effectively through indirect interaction such as oxygen concentration depletion.

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Application of field modelling technique to simulate interaction of sprinkler and fire-induced smoke layer

Cited by 28 publications

References 42 publications

Free Boundary Conditions for Simulating Air Movement in a Big Hall Induced by a "Bare Cabin" Fire

Free Boundary Conditions for Simulating Air Movement in a Big Hall Induced by a "Bare Cabin" Fire

Extension of the compressible PISO algorithm to single-species aerosol formation and transport

Numerical modeling for compartment fire environment under a solid-cone water spray

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