Investigations to improve and assess the accuracy of computational fluid dynamic based explosion models

Popat, N.; Catlin, C.A.; Arntzen, Bjørn J.; Lindstedt, R.P.; Hjertager, Bjørn Helge; Solberg, Tron; Saeter, O; Berg, A.C. van den

doi:10.1016/0304-3894(95)00042-9

Cited by 73 publications

(35 citation statements)

References 10 publications

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“…REAGAS, FLACS, EXSIM, and COBRA) have been developed to achieve this end. 6 In these codes, the resolution of the computational grid is rather coarse and, thus, sub-models are required to describe the effect of obstacles, the turbulent flow, and the combustion processes that occur on much smaller length scales. These sub-models, however, do not accurately describe supersonic combustion controlled by auto-ignition and by shock wave interactions.?…”

Section: Motivationmentioning

confidence: 99%

The propagation mechanism of high speed turbulent deflagrations

Chao

Lee

2003

Shock Waves

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Section: Motivationmentioning

confidence: 99%

The propagation mechanism of high speed turbulent deflagrations

Chao

Lee

2003

Shock Waves

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“…Note that turbulence source terms were ignored in previous studies of Ivings et al [5] , Fothergill et al [3] and Gilham et al [2], whereas these terms are included in this study. For high Reynolds number turbulent flows one could write the momentum source term as [10] …”

Section: Porosity Generationmentioning

confidence: 99%

“…where L is the turbulence length scale associated with the porous region and in this work it is taken as 10% of the obstacle length in a given coordinate direction, C k is a turbulence constant and is generally assumed to be independent of the obstacle type [10]. One method of obtaining C 2 is to use the Ergun equation [11], which gives the pressure drop across a packed bed.…”

Section: Porosity Generationmentioning

confidence: 99%

Validation of geometry modelling approaches for offshore gas dispersion simulations

Ahmed

Bengherbia

Zhvansky

et al. 2016

Journal of Loss Prevention in the Process Industries

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Computational Fluid Dynamics (CFD) codes are widely used for gas dispersion studies on offshore installations. The majority of these codes use single-block Cartesian grids with the porosity/distributed-resistance (PDR) approach to model small geometric details. Computational cost of this approach is low since small-scale obstacles are not resolved on the computational mesh. However, there are some uncertainties regarding this approach, especially in terms of grid dependency and turbulence generated from complex objects. An alternative approach, which can be implemented in generalpurpose CFD codes, is to use body-fitted grids for medium to large-scale objects whilst combining multiple small-scale obstacles in close proximity and using porous media models to represent blockage effects. This approach is validated in this study, by comparing numerical predictions with large-scale gas dispersion experiments carried out in DNV GLs Spadeadam test site. Gas concentrations and gas cloud volumes obtained from simulations are compared with measurements. These simulations are performed using the commercially available ANSYS CFX, which is a general-purpose CFD code. For comparison, further simulations are performed using CFX where smallscale objects are explicitly resolved. The aim of this work is to evaluate the accuracy and efficiency of these different geometry modelling approaches.

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“…For further discussion regarding the relative performances of COBRA and other currently used explosion models, the reader is directed to the work of Popat et al [11].…”

Section: Introductionmentioning

confidence: 99%

Prediction of confined, vented methane-hydrogen explosions using a computational fluid dynamic approach

Woolley

Fairweather

Falle

et al. 2013

International Journal of Hydrogen Energy

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This is a repository copy of Prediction of confined, vented methane-hydrogen explosions using a computational fluid dynamic approach. ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. ABSTRACTHydrogen is seen as an important energy carrier for the future, with a great benefit being carbon-free emissions at its point of use. A hydrogen transport system between manufacturing sites and end users is required, and one solution proposed is its addition to existing natural gas pipeline networks. A major concern with this approach is that the explosion hazard may be increased, relative to natural gas, should an accidental release occur. This paper describes a mathematical model of confined,

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Investigations to improve and assess the accuracy of computational fluid dynamic based explosion models

Cited by 73 publications

References 10 publications

The propagation mechanism of high speed turbulent deflagrations

The propagation mechanism of high speed turbulent deflagrations

Validation of geometry modelling approaches for offshore gas dispersion simulations

Prediction of confined, vented methane-hydrogen explosions using a computational fluid dynamic approach

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