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Two-dimensional CFD modelling of gas-decompression behaviour

Conference Paper


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Abstract


  • ONE OF THE key issues in the design and construction of any gas pipeline is the

    prevention of material fracture. Since the gas is generally transported under high

    operating pressures, it must be ensured that the gas pipeline is sufficiently tough to arrest the

    propagation of any potential fracture. For several decades, control of gas pipeline fracture

    propagation has been under scrutiny due to economic considerations and ecological and safety

    hazards related to pressurised pipe failure. The Battelle Two Curve approach has been widely

    used to determine the minimum material arrest toughness by comparing the gas

    decompression wave velocity with the fracture velocity, both as functions of the local gas

    pressure. Sufficient knowledge of the gas decompression behavior following the rupture is

    therefore crucial in determining running fracture arrest toughness levels. The decompression

    behaviour is influenced by the operating conditions, fluid composition and the material

    properties of the pipeline itself. This paper describes a two-dimensional decompression model

    developed using the commercial Computational Fluid Dynamics (CFD) software ANSYS Fluent.

    The GERG-2008 Equation of State has been implemented into this model to simulate the rapid

    decompression of common natural gas mixtures. The evolution of the decompression wave

    speed and phase changes under arbitrary initial conditions is reported. Comparison with

    experimental results obtained from shock tube tests showed good agreement between

    simulation and experiment.

Publication Date


  • 2013

Citation


  • Elshahomi, A., Lu, C., Michal, G., Liu, X., Godbole, A., Botros, K. K., Venton, P. & Colvin, P. (2013). Two-dimensional CFD modelling of gas-decompression behaviour. The 6th International Pipeline Technology Conference (pp. S18-02-1-S18-02-23). United States: Clarion Technical Conferences.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4358&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3342

Start Page


  • S18-02-1

End Page


  • S18-02-23

Abstract


  • ONE OF THE key issues in the design and construction of any gas pipeline is the

    prevention of material fracture. Since the gas is generally transported under high

    operating pressures, it must be ensured that the gas pipeline is sufficiently tough to arrest the

    propagation of any potential fracture. For several decades, control of gas pipeline fracture

    propagation has been under scrutiny due to economic considerations and ecological and safety

    hazards related to pressurised pipe failure. The Battelle Two Curve approach has been widely

    used to determine the minimum material arrest toughness by comparing the gas

    decompression wave velocity with the fracture velocity, both as functions of the local gas

    pressure. Sufficient knowledge of the gas decompression behavior following the rupture is

    therefore crucial in determining running fracture arrest toughness levels. The decompression

    behaviour is influenced by the operating conditions, fluid composition and the material

    properties of the pipeline itself. This paper describes a two-dimensional decompression model

    developed using the commercial Computational Fluid Dynamics (CFD) software ANSYS Fluent.

    The GERG-2008 Equation of State has been implemented into this model to simulate the rapid

    decompression of common natural gas mixtures. The evolution of the decompression wave

    speed and phase changes under arbitrary initial conditions is reported. Comparison with

    experimental results obtained from shock tube tests showed good agreement between

    simulation and experiment.

Publication Date


  • 2013

Citation


  • Elshahomi, A., Lu, C., Michal, G., Liu, X., Godbole, A., Botros, K. K., Venton, P. & Colvin, P. (2013). Two-dimensional CFD modelling of gas-decompression behaviour. The 6th International Pipeline Technology Conference (pp. S18-02-1-S18-02-23). United States: Clarion Technical Conferences.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4358&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3342

Start Page


  • S18-02-1

End Page


  • S18-02-23