An alternative CFD tool for gas dispersion modelling of heavy gas |
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| Institution: | 1. University of Campinas - UNICAMP, Cidade Universitária “Zeferino Vaz” Av., Albert Einstein, 500, CEP 13083-852 Campinas, SP, Brazil;2. Genesis Oil and Gas Consultants Ltd., 11750 Katy Freeway, Suite 100, Houston, TX 77079, USA;1. Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;2. INERIS, Department PHDS, Parc Technologique ALATA, BP 2, 60550 Verneuil-en-Halatte, France;3. GexCon AS, PO Box 6015, Bergen Bedriftssenter, NO-5892 Bergen, Norway;4. School of Mathematics, University of Leeds, Leeds LS2 9JT, UK;5. Department of Chemical Engineering, University College London, London WC1E 7JE, UK;6. Health & Safety Laboratory, Harpur Hill, Buxton SK17 9JN, UK;7. National Center for Scientific Research “Demokritos”, Institute of Physical Chemistry, Molecular Thermodynamics and Modelling of Materials Laboratory, GR-153 10 Aghia Paraskevi Attikis, Greece;1. Environmental Sensing and Modeling (ESM), Technische Universität München (TUM), Theresienstr. 90, 80333 Munich, Germany;2. Leibniz Supercomputing Centre (Leibniz-Rechenzentrum, LRZ) of the Bavarian Academy of Sciences and Humanities, Boltzmannstr. 1, 85748 Garching, Germany;3. Institute of Meteorology and Climate Research, Karlsruher Institut für Technologie (KIT), Postfach 3640, 76021 Karlsruhe, Germany |
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| Abstract: | The numerical simulation of gas dispersion is of great importance in various areas of engineering such as optimisation, synthesis of chemical process, petroleum industry and process safety. The OpenFOAM (Open Field Operation and Manipulation) code is a free and open source computational fluid dynamics (CFD) program. The current research is focused on the development and customisation of a computational tool for handling gas dispersion of heavy gases, such a LNG and CO2. The novel CFD tool relies on OpenFOAM framework. The core of the work is based on the OpenFOAM solver rhoReactingBuoyantFoam to handle gas dispersion. A series of CFD simulations has been performed for methane and CO2. The source term of the former is modelled by HSM (Hybrid Switch Model). The model comprises contribution from HEM (Homogeneous Equilibrium Model) approach, frozen model and non-equilibrium model for CO2 leak. The novel approach switches between equilibrium and non-equilibrium conditions based on the meta-stable parameter on the grounds of thermodynamics and experimental observations. Good agreement with experimental data is observed. Numerical findings for methane leakage from the proposed CFD tool are compared with experimental data and FLACS. Good agreement is observed. |
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| Keywords: | Chemical process safety Computational fluid dynamics (CFD) Gas dispersion OpenFOAM |
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