Accuracy improvement in evaluation of gas explosion overpressures in congestions with safety gaps |
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| Institution: | 1. School of Civil and Resource Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. GexCon Australia, 8/64 Fitzgerald Street, Northbridge, WA 6003, Australia;1. School of Civil and Resource Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. GexCon Australia, 8/64 Fitzgerald Street, Northbridge, WA 6003, Australia;1. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. Beijing University of Technology and The University of Western Australia Joint Research Center for Sustainable Infrastructure, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China;3. Centre for Infrastructural Monitoring and Protection, Kent Street, Bentley, WA 6102, Australia;1. Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent St, Bentley, WA 6102, Australia;2. Aspec Engineering Pty Ltd, Level 12, 28 The Esplanade, Perth, WA 6000, Australia;1. Lloyd''s Register Consulting, Bergen, Norway;2. DNV GL Group, Loughborough, UK;1. Department of Mechanical and Industrial Engineering, Concordia University, Montréal, Québec, H3G 1M8, Canada;2. Department of Building, Civil and Environmental Engineering, Concordia University, Montréal, Québec, H3G 1M8, Canada;1. Environmental Research Laboratory, INRASTES, National Centre for Scientific Research Demokritos, Patriarchou Grigoriou E & 27 Neapoleos Str., 15341, Agia Paraskevi, Greece;2. National Technical University of Athens, School of Chemical Engineering, Heroon Polytechniou 9, 15780, Zografou, Greece |
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| Abstract: | This paper reports a comparison of simulations and published data from experiments carried out by TNO Prins Maurits Laboratory on geometric configurations that involved safety gaps of various separation distances. The Computational Fluid Dynamics (CFD) based software – FLACS is utilized to conduct the numerical simulations. In the majority of cases, good agreement is found between the simulated results and those obtained by experiment in both the donor and acceptor modules. However, a large discrepancy in the overpressures in the acceptor module is seen when the size of the separation gap approaches one or two times of the module size. A Data-dump technique is used in this study to reset the turbulence length scale for these cases with different separation distances, five sets of explosion scenarios are then numerically simulated and the overpressures are compared with experimentally measured explosion overpressures. The overall results indicate that the software with the Data-dump technique is still an extremely effective tool when it comes to the evaluation of gas explosion overpressures in areas with large separation gaps. |
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| Keywords: | FLACS Data-dump Gas explosions Safety gap Separation distance Overpressure Over-prediction |
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