CFD analysis of natural gas emission from damaged pipelines: Correlation development for leakage estimation

Ebrahimi‐Moghadam, Amir; Farzaneh–Gord, Mahmood; Arabkoohsar, Ahmad; Moghadam, Ali Jabari

doi:10.1016/j.jclepro.2018.07.127

Cited by 98 publications

(30 citation statements)

References 30 publications

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“…The conventional CFD method treats concrete as a single fluid phase, ignoring many solid aggregates, steel fibers, and other components. The Eulerian method is applied to calculate concrete grid fluxes to obtain the velocity variation of the flow process and its shear deformation region [7][8][9]. Some CFD calculation software, such as OpenFoam (the OpenFoam Foundation Ltd, incorporated in England) [10], is freely available and may be used to simulate the variations in the shear deformation flow process.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Chen

Lü

et al. 2022

Materials

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With an increase of suction efficiency of fresh concrete pumping in confined spaces, the laminar flow state will be damaged by the return flow caused by distribution value direction changes and concrete gravity. This is a fact, but one which is rarely studied. In this work, the flow state, flow velocity, and suction efficiency of fresh concrete pumping are simulated using the coupled smooth particle hydrodynamics and Discrete Elements Method (SPH-DEM). The rheological parameters and Herschel-Bulkley-Papanastasiou (HBP) rheological model are adopted to simulate fresh concrete in the numerical simulation model. The study reveals that the error between the slump experimental result and that obtained by the HBP model is negligible. A model is therefore established for numerical simulations of the suction efficiency of fresh concrete pumping. An experimental concrete pumping platform is built, and the pressure and efficiency data during pumping are collected. A comparison of the numerical simulation with experimental results shows that the error is less than 10%.

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Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Chen

Lü

et al. 2022

Materials

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“…Reference [12] developed a 2D and 3D model of a buried gas pipeline intentionally to make calculator equation for low and medium operating pressure pipe with a single leak hole. It was found that the 2D was not realistic as 3D model where linear, second-order, and fourth-order relation were observed between the leak amount and the three effective parameters inlet pressure, leak hole size, and the ratio of the hole size to the pipe diameters, respectively.…”

Section: Introductionmentioning

confidence: 99%

Modelling Flow Behavior of Gas Leakage from Buried Pipelineu

Ndalila¹,

Li²,

Liu³

2020

EJERS

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Risks in gas transportation are usually comprised of losses of the valuable gas, fire, explosion, and destruction to the environment. The safety of this infrastructure especially flammable gas pipelines is of great importance due to potential associated risks when leakage happens. An accurate understanding of the dispersion characteristics of the leaked gas from the underground pipe is of great importance. A gas leaking model from the buried pipeline was established based on computational fluid dynamics (CFD) technique, to simulate the situation. At the incidence of leakage, gas will propagate out and cause changes in flow behavior, which will prompt the detectors. The leakage position influences significantly much on the strength of leak signals to be detected at the ground surface. Under the simulation process, the double leakage pipeline model was involved. The variation of flow parameters inside the pipeline, outside pipeline, and the effect of leakage position were depicted and analyzed.

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“…Moreover, the spatio-temporal distribution of the gas-air cloud in the atmosphere is affected by weather conditions and the presence of buildings [5][6][7]. In [8][9][10], numerical methods for determining direct gas losses from aboveground, underground, and underwater gas pipelines, the routes of which can pass through settlements are considered. The calculation of distribution of the damaging factors of accidents on gas pipelines allows us to assess with a reasonable degree of probability the possible zones of damage and the degree of the accident consequences [11,12].…”

Section: Introductionmentioning

confidence: 99%

Damage areas during emergency depressurization of a gas pipeline

et al. 2019

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Main gas pipelines are classified as energetically stressed objects. With an increase in their service life, there appears a need to model emergency breaks and analyze the distribution of the damaging factors of the accident. The main gas pipelines often run near residential areas and cross various communications, therefore possible accidents with gas emissions and damaging factors can negatively affect both the environment and the population. An emergency rupture of a gas pipeline section is numerically modeled in this article. The calculations of intensity of accidental gas emissions outflow and distribution of the accident damaging (the length of the methane jet in unlimited airspace, the range and height of the scattering of the soil and pipe fragments were found). The parameters of free jets of exhaust gas were determined. Such calculation is required during investigation of accidents and development of documents related to the environmentally safe operation of pipeline transport. In case of gas non-ignition, it disperses in the atmosphere with the formation of gas zones. The study of the influence of velocity, density and pressure on the emergency gas emission allows us to determine possible gas contamination zones. Graphs of distribution of static and total pressure over the ejection height, distribution of velocities along the axis of the ejected jet and along the axis of the pipeline were obtained. The ability to evaluate the parameters of free jet flow of natural gas (methane) from a damaged pipeline: the total flow rate, total pressure and flow rate at the rupture point is relevant in solving applied environmental safety problems of gas transportation facilities.

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CFD analysis of natural gas emission from damaged pipelines: Correlation development for leakage estimation

Cited by 98 publications

References 30 publications

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Modelling Flow Behavior of Gas Leakage from Buried Pipelineu

Damage areas during emergency depressurization of a gas pipeline

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