An enhanced weighted essentially non-oscillatory high order scheme for explosion modelling
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ORIGINAL PAPER
An enhanced weighted essentially non‑oscillatory high order scheme for explosion modelling Elmo de Sena Ferreira Jr1 · Sávio Souza Venâncio Vianna1 Received: 29 February 2020 / Revised: 24 June 2020 / Accepted: 27 June 2020 © Associação Brasileira de Engenharia Química 2020
Abstract Physical explosion causes large damages in the process industry and quite often escalates to chemical explosions. The shock waves generated by such events are challenging to model and they must be numerically captured without spurious oscillations in order to make an accurate estimative of the accidental effects. In this context, this paper investigates how a new high order numerical scheme models the physical explosion. We have considered a confined explosion in a spherical vessel and blast load throughout pipelines as the framework to investigate the performance of the numerical scheme. The developed numerical approach considers the effect of less smooth substencils when there is a discontinuity inside the stencil based on the local Mach number what avoids oscillations and instability. The numerical solution of the fundamental equations is coupled with the Modified Colebrook-White formulation in order to consider the blast load through the pipeline. Shock waves from experimental data and analytical model are used to validate the proposed model. The research provides an efficient method for prediction of blast loads from spherical vessels rupture to an open atmosphere and in pipelines. Keywords Weighted essentially non oscillatory scheme · Physical explosion · Process safety
Introduction Explosion in the process industry is among the most severe accidents leading to significant losses and contributing to the risk level of chemical process facilities. The accidental explosions can be split into chemical explosion and physical explosion. In accordance with Abbasi and Abbasi (2007), chemical explosion may be based on deflagration or detonation depending on the speed of the propagation of the flame front. On the other hand, physical explosions are classified as compressed gas/vapour explosion (CG/CE), boiling liquid expanding vapor explosion (BLEVE) and rapid phase transition (RPT) explosion. Several accidents due to physical and/or chemical explosions are described in the literature (Lewis 1980; Khan and Abbasi 1999; FI 1999). In 2018, the Petrobras refinery at Paulinia (Replan—Sao Paulo—Brazil) experienced a physical explosion followed by chemical explosion at the storage tank of acid waters. Significant damage to equipment was observed and it halted the production.
* Sávio Souza Venâncio Vianna [email protected] 1
University of Campinas, Campinas, Brazil
The understanding of explosion phenomenon and the associated impact in the industry helps to enhance safety in various industrial sites. Experiments concerning explosions, however, are costly and potentially dangerous (Oliveira et al. 2019). Alternatively, numerical simulations can help to shed light on the comprehension of various aspects of the phenomenon. M
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