An Interpolation Technique for Rapid CFD Simulation of Turbulent Two-Phase Flows

Mahgerefteh, H; Atti, Olufemi; Denton, Garfield

doi:10.1205/psep.05118

Cited by 17 publications

(14 citation statements)

References 21 publications

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“…A linear interpolation scheme was also implemented within the UDF to extract values of the other thermodynamic parameters based on the P-T values solved for by Fluent. This method has proved to be 300 times faster than direct calls to EOS [54] and could save up to 70% of the total computational run time [55]. In this study the performance of the UDF was tested using both methods and for all properties, the search in tables during the simulation was found to be about 20 times faster than a direct call to the library.…”

Section: Implementation Of Gerg-2008 Eos Into Ansys Fluentmentioning

confidence: 93%

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: Implementation Of Gerg-2008 Eos Into Ansys Fluentmentioning

confidence: 93%

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

et al. 2015

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“…and on the other hand are respectively the heat transfer coefficients on 146 both the internal and external sides of the pipe wall. Both values are calculated using standard 147 correlations for forced and natural convection heat transfer (Mahgerefteh et al, 2007). 148…”

Section: Steady-state Flow Modelmentioning

confidence: 99%

A multi-source flow model for CCS pipeline transportation networks

Brown

Mahgerefteh

Martynov

et al. 2015

International Journal of Greenhouse Gas Control

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“…Picard and Bishnoi (1988) proposed a one-dimensional discharge model assuming the conservation of mass, momentum, enthalpy and energy. Using an Equation of State (EOS) for closure, the time-varying discharge of high-pressure fluid can be simulated (Mahgerefteh et al, 2007;Mazzoldi et al, 2012). As the fluid is considered to remain at thermal and mechanical equilibrium during the decompression process, the non-equilibrium liquid/vapour transition phenomena are ignored in this model.…”

Section: Introductionmentioning

confidence: 99%

Study of the consequences of CO2 released from high-pressure pipelines

Liu

Godbole

Lü

et al. 2015

Atmospheric Environment

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The development of the Carbon Capture and Storage (CCS) technique requires an understanding of the hazards posed by the operation of high-pressure CO 2 pipelines. To allow the appropriate safety precautions to be taken, a comprehensive understanding of the consequences of unplanned CO 2 releases is essential before the deployment of CO 2 pipelines. In this paper, we present models for the predictions of discharge rate, atmospheric expansion and dispersion due to accidental CO 2 releases from high-pressure pipelines. The GERG-2008 Equation of State (EOS) was used in the discharge and expansion models. This enabled more precise 'source strength' predictions. The performance of the discharge and dispersion models was validated against experimental data. Full-bore ruptures of pipelines carrying CO 2 mixtures were simulated using the proposed discharge model. The propagation of the decompression wave in the pipeline and its influence on the release rate are discussed. The effects of major impurities in the CO 2 mixture on the discharge rate were also investigated. Considering typical CO 2 mixtures in the CCS applications, consequence distances for CO 2 pipelines of various sizes at different stagnation pressures were obtained using the dispersion model. In addition, the impact of H2S in a CO 2 mixture was studied and the threshold value of the fraction of H 2 S at the source for which the hazardous effects of H 2 S become significant was obtained. AbstractThe development of the Carbon Capture and Storage (CCS) technique requires an understanding of the hazards posed by the operation of high-pressure CO 2 pipelines. To allow the appropriate safety precautions to be taken, a comprehensive understanding of the consequences of unplanned CO 2 releases is essential before the deployment of CO 2 pipelines. In this paper, we present models for the predictions of discharge rate, atmospheric expansion and dispersion due to accidental CO 2 releases from high-pressure pipelines. The GERG-2008 Equation of State (EOS) was used in the discharge and expansion models. This enabled moreprecise 'source strength' predictions. The performance of the discharge and dispersion models was validated against experimental data. Full-bore ruptures of pipelines carrying CO 2 mixtures were simulated using the proposed discharge model. The propagation of the decompression wave in the pipeline and its influence on the release rate are discussed. The effects of major impurities in the CO 2 mixture on the discharge rate were also investigated. Considering typical CO 2 mixtures in the CCS applications, consequence distances for CO 2 pipelines of various sizes at different stagnation pressures were obtained using the dispersion model. In addition, the impact of H 2 S in a CO 2 mixture was studied and the threshold value of the fraction of H 2 S at the source for which the hazardous effects of H 2 S become significant was obtained. Keywords

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An Interpolation Technique for Rapid CFD Simulation of Turbulent Two-Phase Flows

Cited by 17 publications

References 21 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 multi-source flow model for CCS pipeline transportation networks

Study of the consequences of CO2 released from high-pressure pipelines

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