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Modified porosity approach and laminar flamelet modelling for advanced simulation of accidental explosions
Authors:Sávio SV Vianna  R Stewart Cant
Institution:1. The Collaborative Innovation Center of Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo, 454003, Henan, PR China;2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo 454003, Henan, PR China;3. School of Marxism Studies, Henan Polytechnic University, Jiaozuo, 454003, Henan, PR China;1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;2. Anhui International Joint Research Center on Hydrogen Safety, Hefei, 230009, PR China;1. Gexcon AS, Fantoftvegen 38, 5072, Bergen, Norway;2. Department of Physics and Technology, University of Bergen, Allégaten 55, 5007 Bergen
Abstract:The production of oil and gas is an inherently hazardous task. Therefore it is crucial to provide reliable estimates of the risks involved. The major contributors to the risk level of an offshore installation, for example, arise from accidents involving explosion and fire. Computational Fluid Dynamics (CFD) can be a powerful tool to help with the calculation of accidental explosion scenarios. In this context, the present work suggests a novel implementation of a model based on a modified Porosity Distributed Resistance (MPDR) approach within an unstructured 3D Navier–Stokes solver. The model operates by representing parts of the filtered geometry from the original model through porosity values attributed to an unstructured tetrahedral mesh. Extra resistance terms are added in the momentum equation as well as extra sources of turbulence. Two extra sources of turbulence are modelled. The first of these is due to the shear layers of the non-resolved obstacles, whilst the second is due to the presence of wakes behind the non-resolved obstacles. Results for 2D and 3D test cases are compared against both experimental data and simulations with fully-resolved geometry and good agreement is observed.
Keywords:
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