New correlation for vapor cloud explosion overpressure calculation at congested configurations

Li, Jingde; Abdel–jawad, Madhat; Ma, Guowei

doi:10.1016/j.jlp.2014.05.013

Cited by 43 publications

(19 citation statements)

References 21 publications

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“…Hybrid methods implemented in a code such as exploCFD have emerged recently as a viable alternative to both analytical methods and the pure CFD approach because these hybrid methods offer much faster solution times than the pure CFD approach with little accuracy loss 12,13 for the key results required, and at the same time these hybrid methods are far more accurate than a pure analytical approach with similar calculation times. 13 The main objective from the introduction of the hybrid method for BLEVEs is to capture the maximum overpressure and impulse in the wider domain around a BLEVE considering the obstacles which is a capability that cannot be achieved using only an analytical method. The exact time history in the area surrounding a BLEVE while important, can be classified as of secondary importance compared with this objective.…”

Section: Introductionmentioning

confidence: 99%

Validation of BLEVE events using the hybrid code exploCFD

Abdel–jawad¹

2020

Process Safety Progress

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A hybrid (analytical-numerical) method for the modeling of BLEVE events seems the most realistic approach given the complex coupled physical models required for a purely numerical approach. The code exploCFD employs just such a method for the calculation of events involving multiple types of explosions including BLEVEs whereby the results from an analytical model are fed into a CFD code to model the wider domain. The CFD code is configured as a 2D solver hence the methodology carries some uncertainty. So how do the results from a hybrid method compare with those obtained from experiments? Here we look at the BLEVE experiments of Birk and Vandersteen. We show that despite simplifications inherent in the methodology, which include the combining separate discrete events such as initial tank rupture, catastrophic failure and mixing and subsequent ignition into one equivalent event, exploCFD produces results which are in good agreement with the experimental peak pressures and impulses. The peak pressure is captured at locations 10, 20, 30, and 40 m from tank side and the impulse values also show good agreement. Surprisingly, the time histories also show better than expected agreement.

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Section: Introductionmentioning

confidence: 99%

Validation of BLEVE events using the hybrid code exploCFD

Abdel–jawad¹

2020

Process Safety Progress

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“…6(b), where the turbine air intake and scrubber are placed on the right hand side even further away from the ignition coming from left). The longer the flame path length is, the longer time the flame turbulence develops within the congestion, which further induces greater overpressures [19,20].…”

Section: Flng Platformmentioning

confidence: 99%

Gas explosion analysis of safety gap effect on the innovating FLNG vessel with a cylindrical platform

Hao

et al. 2016

Journal of Loss Prevention in the Process Industries

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After investigating gas dispersion on a cylindrical Floating Liquefied Natural Gas (FLNG) platform [1], this second article focuses on assessment of gas explosion by using Computational Fluid Dynamics (CFD). Gas explosion simulations are carried out to evaluate the explosion overpressure mitigating effect of safety gap. The Datadump technique, which is an effective tool in resetting turbulence length scale in gas explosion overpressure calculation, is applied to ensure simulation accuracy for the congestion scenario with safety gap. Two sets of different safety gaps are designed to investigate the safety gap on the cylindrical FLNG platform, the overall results indicate that the safety gap is effective in reducing overpressure in two adjacent congestions. However, for the explosion scenario where the flame is propagating through several safety gaps to the far field congestion, the safety gap mitigates overpressure only in certain explosion protecting targets. Two series of artificial configurations are modelled to further investigate the explosion scenarios with more than two safety gaps in one direction. It is concluded that the optimal safety gap design in overpressure mitigation for the cylindrical FLNG platform is to balance the safety gap distance ratio in the congested regions.

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“…It is generally difficult to analyze an explosion accident because there are many factors which influence the phenomenon like flame instabilities and flame‐turbulence interaction that should be considered in numerical simulations . In addition, the facility geometry, structure, and obstacles at the spot affect the explosion . Moreover, the fuel, oxygen, and ignition affecting the explosion need to be analyzed .…”

Section: Introductionmentioning

confidence: 99%

“…2,3 In addition, the facility geometry, structure, and obstacles at the spot affect the explosion. 4 Moreover, the fuel, oxygen, and ignition affecting the explosion need to be analyzed. 5 Empirical approaches using simple, numerical, and analytical methodologies such as TNT equivalent or TNO multi-energy model may not be sufficiently accurate since they do not consider the aforementioned factors, while computational fluid dynamics (CFD) can be used to compute the overpressure impact considering these factors.…”

mentioning

confidence: 99%

CFD/FEA connected modeling and analysis of vapor cloud explosion at a wastewater storage pond of a chemical plant in Korea

Jang¹,

Han

Jeong

et al. 2019

Energy Science & Engineering

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This paper describes and reports an analysis of an explosion accident at a wastewater storage pond in South Korea, which resulted in six fatalities and one injury. This study was aimed at analyzing and determining the possibility of fracture of concrete structure by vapor cloud explosion (VCE) and ignition point of explosion, using computational fluid dynamics (CFD) for the explosion simulation. The result obtained via CFD analysis was connected with finite element analysis (FEA) to accurately review the structural damages resulting from the explosion. As a result, the mechanism of the accident was determined, and preventive solutions against such accidents are recommended.

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New correlation for vapor cloud explosion overpressure calculation at congested configurations

Cited by 43 publications

References 21 publications

Validation of BLEVE events using the hybrid code exploCFD

Validation of BLEVE events using the hybrid code exploCFD

Gas explosion analysis of safety gap effect on the innovating FLNG vessel with a cylindrical platform

CFD/FEA connected modeling and analysis of vapor cloud explosion at a wastewater storage pond of a chemical plant in Korea

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