Modelling outflow following rupture in pipeline networks

Mahgerefteh, H; Oke, Adeyemi; Atti, Olufemi

doi:10.1016/j.ces.2005.10.013

Cited by 34 publications

(20 citation statements)

References 14 publications

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“…The MOC solves the fluid flow conservation equations by following the Mach-line characteristics inside the pipe. It is claimed that numerical diffusion related to the finite difference approximation of partial derivatives is reduced by this method [33,34], but the MOC needs much longer computation runtimes and cannot predict non-equilibrium or heterogeneous flows [25,35], while the FVM is better at dealing with multi-dimensional flow. In the existing CFD models, the cubic Peng-Robinson (PR) EOS [36] is often used due to its relatively simple mathematical form compared to other more complex (but more accurate) EOS such as AGA-8 [37], BWRS [13] and GERG [20].…”

Section: Computational Fluid Dynamics (Cfd) Technique Have Been Develmentioning

confidence: 99%

Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

et al. 2015

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The development of CO2 pipelines for Carbon Capture and Storage (CCS) raises new questions regarding the control of ductile fracture propagation and fracture arrest toughness criteria. The decompression behaviour in the fluid must be determined accurately in order to estimate the proper pipe toughness. However, anthropogenic CO2 may contain impurities that can modify the fluid decompression characteristics quite significantly. To determine the decompression wave speed in CO2 mixtures, the thermodynamic properties of these mixtures must be determined by using an accurate equation of state. In this paper we present a new decompression model developed using the Computational Fluid Dynamics (CFD) package ANSYS Fluent. The GERG-2008 Equation of State (EOS) was implemented into this model through User Defined Functions (UDF) to predict the thermodynamic properties of CO2 mixtures. The model predictions were in good agreement with the experimental data of two 'shock tube' tests. A range of representative CO2 mixtures was examined in terms of the changes in fluid properties from the initial conditions, with time and distance, immediately after a sudden pipeline opening at one end. Phase changes that may occur within the fluid due to condensation of 'impurities' in the fluid were also investigated. Simulations were also conducted to examine how the initial temperature and impurities would affect the decompression wave speed.

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Section: Computational Fluid Dynamics (Cfd) Technique Have Been Develmentioning

confidence: 99%

Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

et al. 2015

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“…We have calculated thermodynamic pipeline decompressions from three representative pipeline conditions, specified in Table I using a method similar to that presented in 16 . Figure 7 shows the thermodynamic decompression paths from these three initial conditions in a pressure-temperature p-T diagram.…”

Section: Initial Conditionsmentioning

confidence: 99%

A composite equation of state for the modeling of sonic carbon dioxide jets in carbon capture and storage scenarios

et al. 2013

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The development of a novel composite two‐phase method to predict the thermodynamic physical properties of carbon dioxide (CO2) above and below the triple point, applied herein in the context of Reynolds‐Averaged Navier–Stokes computational modeling has been detailed here. A number of approaches have been combined to make accurate predictions in all three phases (solid, liquid, and gas) and at all phase changes for application in the modeling of releases of CO2 at high pressure into the atmosphere. Predictions of a free release of CO2 into the atmosphere from a reservoir at a pressure of 10 MPa and a temperature of 283 K, typical of transport conditions in carbon capture and storage scenarios, is examined. A comparison of the results shows that the sonic CO2 jet that forms requires a three‐phase equation of state including the latent heat of fusion to realistically simulate its characteristics. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3928–3942, 2013

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“…The temperature profiles were generated using PipeTech, which takes into account phase-dependent transient heat-transfer effects. 8 As it may be observed, in the case of the gaseous inventory (Figure 7), at any given time interval following puncture, the drop in the temperature due to its expansion-induced cooling is significantly higher than that for the two-phase mixture (Figure 8). At 20 s following puncture, for example, the maximum drop in the gas temperature is about 22 C. This compares with only 2 C for the two-phase mixture.…”

Section: Resultsmentioning

confidence: 88%

When does a vessel become a pipe?

2011

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The conditions under which the transient outflow from a punctured pipeline may be approximated as that emanating from a vessel using a simplified analytically based vessel blowdown model (VBM) is investigated in this article. The above addresses the fundamental drawback of long computational run times associated with the numerically based techniques used for simulating pipeline puncture failures. The efficacy of the VBM is tested by comparison of its predictions against simulation data obtained using a validated rigorous but computationally demanding numerical technique based on the method of characteristics. The results show that the accuracy of the VBM increases with decreasing puncture/pipe diameter ratio, line pressure, and increasing pipeline length. Surprisingly, the VBM produces more accurate predictions for twophase mixtures when compared with permanent gases. This is found to be a consequence of the better applicability of the isothermal bulk fluid decompression assumption within the pipeline in the case of two-phase mixtures.

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Modelling outflow following rupture in pipeline networks

Cited by 34 publications

References 14 publications

Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

A composite equation of state for the modeling of sonic carbon dioxide jets in carbon capture and storage scenarios

When does a vessel become a pipe?

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