CFD modelling of accidental hydrogen release from pipelines

Wilkening, Heinz; Baraldi, Daniele

doi:10.1016/j.ijhydene.2007.04.022

Cited by 97 publications

(34 citation statements)

References 3 publications

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“…Albriet et al (2010), Uhrner et al (2007), Wang and Zhang (2012), and has also been applied by various researchers to investigate hydrogen diffusion related to hydrogen refueling, Kikukawa (2008), Papanikolaou and Venetsanos (2007), the leak of hydrogen and methane from high pressure pipelines, Wilkening and Baraldi (2007), as well as the diffusion of LNG vapours, Gavelli et al (2008) or dense gas releases in buildings (Gilham et al, 2000). However, there is a lack of numerical simulations of the spatial concentration of VOCs originating typically from gasoline in the areas of petrol stations.…”

Section: Present Contributionmentioning

confidence: 99%

Numerical investigation of VOC levels in the area of petrol stations

Kountouriotis

Aleiferis

Charalambides

2014

Science of The Total Environment

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Section: Present Contributionmentioning

confidence: 99%

Numerical investigation of VOC levels in the area of petrol stations

Kountouriotis

Aleiferis

Charalambides

2014

Science of The Total Environment

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“…Blast waves that produce vibration in a wide variety of soil environment can be damaging for these pipelines. Therefore, in order to improve the safety of underground transmission pipelines, knowledge about dynamic impact of explosions and response of structures would be useful (Mokhtari & Alavi Nia, 2015;Wilkening & Baraldi, 2007). Explosion phenomenon has been an interesting field to researchers worldwide.…”

Section: Introductionmentioning

confidence: 99%

A parametric study on the effects of surface explosions on buried high pressure gas pipelines

Adibi¹,

Azadi²,

Farhanieh³

et al. 2017

10.5267/j.esm

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Underground gas pipelines are one of the vital parts of each country which surface blasts can break down such pipelines, making destructive explosions and threatening the safety of neighborhood structures and people. In this paper, to enhance the safety of these lines, response of a buried 56-inch diameter high pressure natural gas pipeline to a surface blast was numerically investigated. Besides, the effects of: i) explosive mass, ii) pipeline thickness, iii) burial depth and iv) concrete protective layer on pipeline deformation were parametrically studied. To simulate the problem according to actual explosion events, geometries were modeled in real scales, pipeline properties were predicted with Johnson-Cook strength and failure model and soil strength was determined by Drucker-Prager model. Also, explosive charge and natural gas were modeled with JWL (Jones-Wilkins-Lee) and ideal gas equation of states. For validation of the numerical method, three bench mark experiments were reproduced. Comparison of the numerical results and the experimental data confirmed the accuracy of the numerical method. Results of parametric studies indicated that by increasing the burial depth from 1.4 to 2.2 m, deformation of the pipeline was reduced about 71%. By analyzing the deformation plots, it was found that in a constant explosive mass, burial depth has a greater effect than pipeline thickness on pipeline deformation reduction. It was also shown that using a concrete protective layer may act reversely and increase pipeline destruction. In other words, to enhance the safety of pipelines, a certain thickness of concrete must be used.

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“…For instance, in 2004, negligence of drilling workers caused a crack in Belgium methane pipelines. Thereafter, methane released to atmosphere and made major fire in the area which killed at least 15 people [1].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to analytical studies, numerical methods can predict structure of flow with more realistic assumptions and with more details. One of the most important numerical studies in this field was accomplished by Wilkening and Baraldi [1]. They simulated leakage of methane and hydrogen in 2D and 3D cases.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of heat and mass transfer in underexpanded sonic free jet

Adibi¹,

Farhanieh²,

Afshin³

2017

IJHT

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In case of unexpected ruptures in high pressure tanks, choking phenomenon occurs in the cracked area which fluid velocity gets sonic and its pressure exceeds atmospheric pressure. Afterward, pressure of discharged gas quickly changes by crossing through compression and expansion shock waves. The main aim of this study was numerical simulation and investigation of this flow in a 3-step process: (a) Detailed analysis of numerical method, (b) Qualitative and quantitative analysis of velocity, pressure, temperature and turbulence intensity, in order to propose safety strategies and (c) parametric studies on the effects of tank pressure and nozzle geometry on flow structure. In numerical simulations, governing equations (conservation of mass, momentum, energy and equation of state) were discretized based on the finite volume method and flow variables (velocity, pressure, temperature and density) were calculated using density-based algorithm. Validation of numerical method was achieved by comparison with experimental data. The results showed that within 4.4 mm of cracked area, fluid temperature reached to its minimum value of 86 K which would freeze nearby equipment and would make them fragile. Also, parametric studies indicated that inlet pressure had direct relation with exhausted mass flow rate and its maximum occurred in nozzle angle of 3.82 o .

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CFD modelling of accidental hydrogen release from pipelines

Cited by 97 publications

References 3 publications

Numerical investigation of VOC levels in the area of petrol stations

Numerical investigation of VOC levels in the area of petrol stations

A parametric study on the effects of surface explosions on buried high pressure gas pipelines

Numerical study of heat and mass transfer in underexpanded sonic free jet

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