Consequences assessment of explosions in pipes using coupled FEM-SPH method |
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| Institution: | 1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;2. Institute of Solid Mechanics, Zhejiang University of Technology, Hangzhou 310014, China;3. The State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Hangzhou 310027, China;4. Engineering Research Center of High Pressure Process Equipment and Safety, MOE, Zhejiang University, Hangzhou 310027, China;1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;2. Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University, Shanghai 200092, China;1. Nanjing Tech University, College of Safety Science and Engineering, China;2. Jiangsu Key Laboratory of Urban and Industrial Safety, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, China;1. Department of Safety Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, China;2. College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China;3. Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China;4. Institute of Solid Mechanics, Zhejiang University of Technology, Hangzhou, 310014, China;5. Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing, 100081, China;1. School of Science and Engineering, University of Dundee, Dundee, UK;2. School of Energy, Geoscience, Infrastructure and Society, Heriot Watt University, UK;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 |
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| Abstract: | Explosions often lead to destruction of equipment, which is a difficult problem including complicated fluid-solid interactions. Most traditional CFD methods cannot synchronously solve the movements of fluids and large deformation and fracture of solids because such problem is usually accompanied with constantly moving-and-changing boundary conditions. In this paper, a coupled Finite Element Method-Smoothed Particle Hydrodynamics (FEM-SPH) method was proposed to simulate the dynamic processes of explosions in pipes. The propagation of blast wave and the fracture of pipe were captured in every timestep, where the energy dissipation caused by plastic deformation and crack propagation were fully considered. A rate-dependent failure criterion for high-strain-rate load conditions was employed in the numerical simulation, which was presented in our previous work and has been verified in the dynamic fracture behavior of steels for pressure vessels and pipes. In addition, a simpler formula was proposed to describe the attenuation of blast wave outside the pipe and the consequences caused by the explosions were assessed. Results revealed the interaction between blast wave and pipe, the leakage of detonation products, the attenuations of peak overpressures outside the pipe and the corresponding consequences at different distances. It is found that when considering the energy consumption during plastic deformation and crack propagation in coupled FEM-SPH method, the assessment results are more rational than that without considering such energy consumption. |
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| Keywords: | Pipe explosion Consequences assessment Blast wave Dynamic fracture Smoothed particle hydrodynamics |
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