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INP Toulouse

1. Pandya, Nishant. Analyse de sensibilité paramétrique d’un outil de modélisation des conséquences de scénarios d’accidents. Application à la dispersion atmosphérique de rejets avec le logiciel Phast : Parametric sensitivity analysis of a modelling tool for consequence estimation. Application to the atmospheric dispersion of accidental releases with the Phast software.

Degree: Docteur es, Génie des procédés et de l'environnement, 2009, INP Toulouse

L’objectif de la thèse est d’effectuer l’analyse de sensibilité paramétrique du logiciel Phast de modélisation de la dispersion atmosphérique de gaz toxiques et/ou inflammables. La technique a consisté à coupler Phast et l’outil d’analyse de sensibilité SimLab, ce qui permet d’exécuter automatiquement un grand nombre de simulations en faisant varier l’ensemble des paramètres du modèle de façon simultanée. La méthode d’analyse de sensibilité globale choisie, E-FAST, est basée sur l’analyse de la variance des sorties du modèle pour le calcul des indices de sensibilité. Nous avons étudié des scénarios de rejet continus pour six produits différents (monoxyde d’azote, ammoniac, chlore, azote, n-hexane et fluorure d’hydrogène), sélectionnés pour couvrir une large gamme de caractéristiques physiques et de conditions de stockage. L’analyse du modèle de dispersion de Phast, Unified Dispersion Model, a été séparée en deux étapes : étape de « screening » avec pour but de comparer l’influence de l’ensemble des paramètres puis étude de l’influence globale des paramètres de modélisation, autres que les paramètres météo et du terme source, sur une plage large de valeurs. Pour chaque produit, nous avons décomposé les scénarios de base en sous-scénarios correspondant à des conditions de rejet différentes. Ce travail a notamment permis de classifier les paramètres du modèle selon leur degré d’influence sur la variabilité de différentes sorties et d’effectuer une analyse comparative par produit indiquant, pour des conditions de rejet données, quels paramètres sont les plus influents sur les sorties. Une étude complémentaire a consisté à effectuer une analyse de sensibilité locale de ces paramètres autour de leur valeur par défaut.

We have undertaken a parametric sensitivity analysis of the Phast software tool’s models for atmospheric dispersion of toxic and/or inflammable gases. We have coupled Phast with the sensitivity analysis tool SimLab, and have automated the execution of a large number of simulations while varying simultaneously selected model parameters. The global sensitivity analysis method used, E-FAST, is based on analysis of the variance of model outputs, and allows us to estimate sensitivity indices. We have studied continuous release scenarios for six different products (nitric oxide, ammonia, chlorine, nitrogen, n-hexane and hydrogen fluoride), which were chosen to cover a wide range of physical characteristics and storage conditions. Our analysis of Phast’s Unified Dispersion Model comprises two phases: a screening phase which allows the sensitivity of a wide range of parameters to be compared, followed by a phase focusing on the sensitivity of internal model parameters (excluding weather and source term variables), over a wide input range. For each product, we have broken down base-case scenarios into a number of sub-scenarios corresponding to different release conditions. This work has allowed us to rank model parameters according to their influence on the variability of a number of model outputs. It also includes…

Advisors/Committee Members: Gabas, Nadine (thesis director).

Subjects/Keywords: Risque industriel; Rejet accidentel; Dispersion atmosphérique; Modélisation de conséquences; Logiciel Phast; Analyse de sensibilité; Industrial safety; Accidental release; Atmospheric dispersion; Consequence modelling; Phast software; Sensitivity analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pandya, N. (2009). Analyse de sensibilité paramétrique d’un outil de modélisation des conséquences de scénarios d’accidents. Application à la dispersion atmosphérique de rejets avec le logiciel Phast : Parametric sensitivity analysis of a modelling tool for consequence estimation. Application to the atmospheric dispersion of accidental releases with the Phast software. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2009INPT031G

Chicago Manual of Style (16th Edition):

Pandya, Nishant. “Analyse de sensibilité paramétrique d’un outil de modélisation des conséquences de scénarios d’accidents. Application à la dispersion atmosphérique de rejets avec le logiciel Phast : Parametric sensitivity analysis of a modelling tool for consequence estimation. Application to the atmospheric dispersion of accidental releases with the Phast software.” 2009. Doctoral Dissertation, INP Toulouse. Accessed October 18, 2019. http://www.theses.fr/2009INPT031G.

MLA Handbook (7th Edition):

Pandya, Nishant. “Analyse de sensibilité paramétrique d’un outil de modélisation des conséquences de scénarios d’accidents. Application à la dispersion atmosphérique de rejets avec le logiciel Phast : Parametric sensitivity analysis of a modelling tool for consequence estimation. Application to the atmospheric dispersion of accidental releases with the Phast software.” 2009. Web. 18 Oct 2019.

Vancouver:

Pandya N. Analyse de sensibilité paramétrique d’un outil de modélisation des conséquences de scénarios d’accidents. Application à la dispersion atmosphérique de rejets avec le logiciel Phast : Parametric sensitivity analysis of a modelling tool for consequence estimation. Application to the atmospheric dispersion of accidental releases with the Phast software. [Internet] [Doctoral dissertation]. INP Toulouse; 2009. [cited 2019 Oct 18]. Available from: http://www.theses.fr/2009INPT031G.

Council of Science Editors:

Pandya N. Analyse de sensibilité paramétrique d’un outil de modélisation des conséquences de scénarios d’accidents. Application à la dispersion atmosphérique de rejets avec le logiciel Phast : Parametric sensitivity analysis of a modelling tool for consequence estimation. Application to the atmospheric dispersion of accidental releases with the Phast software. [Doctoral Dissertation]. INP Toulouse; 2009. Available from: http://www.theses.fr/2009INPT031G


University of Lund

2. Andersson, Petra. Evaluation and Mitigation of Industrial Fire Hazards.

Degree: 1997, University of Lund

A tool suitable for conducting industrial fire and explosion hazard analysis is presented, together with an identification of weak links in the hazard evaluation chain. For some of the weak links additional research has been carried out. The tool, "FREIA", evaluates the consequences for humans and components due to fires and accidental releases indoors and outdoors using established engineering methods. Investigations have been carried out to find possible methods to simulate detector activation. The temperature, velocity, soot, CO2, CO and oxygen concentration were determined in the plume above a fire. Close agreement was found between the different compound fields. A CFD simulation of the same plume closely matched the experiments. However, there are large uncertainties involved when transforming light attenuation measurements into soot volume fraction. Simulations of tests according to the EN54 detector standard were also carried out. The agreement differed for different fuels. In addition, there is a problem with comparing light attenuation measurement performed at different wavelengths. All the results obtained indicate that it is possible to model smoke detector activation by treating the soot as an inert gas, or by assuming the soot concentration closely corresponds to one of the other compound fields. Heat detector activation is not as complicated to simulate. The phasing out of halons often demands new solutions in order to maintain the given protection level. More recently water mist has been mentioned as a possible replacement for halons. Experiments together with theoretical considerations have shown that no presently available water mist system fulfils the requirements of a total flooding system. A narrow window exists, however, in which a water mist can function as a total flooding system. Several halon-like agents have been developed. These, however, produce more thermal decomposition products than halons, the amount produced was found to be proportional to the amount of fuel burnt in the presence of the agent. In addition, experiments have shown that they can actually increase the fire instead of extinguishing it, if not properly designed. Estimating human burns is difficult; a test dummy for such measurements is presented.

Subjects/Keywords: Annan samhällsbyggnadsteknik; Husbyggnad; Teknik; Technological sciences; Effect of fires; Accidental release; Water mist; Halon replacement; Industrial Fire Hazards; Human burns; Smoke detektion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Andersson, P. (1997). Evaluation and Mitigation of Industrial Fire Hazards. (Doctoral Dissertation). University of Lund. Retrieved from http://lup.lub.lu.se/record/29649 ; http://portal.research.lu.se/ws/files/4374264/2064096.pdf

Chicago Manual of Style (16th Edition):

Andersson, Petra. “Evaluation and Mitigation of Industrial Fire Hazards.” 1997. Doctoral Dissertation, University of Lund. Accessed October 18, 2019. http://lup.lub.lu.se/record/29649 ; http://portal.research.lu.se/ws/files/4374264/2064096.pdf.

MLA Handbook (7th Edition):

Andersson, Petra. “Evaluation and Mitigation of Industrial Fire Hazards.” 1997. Web. 18 Oct 2019.

Vancouver:

Andersson P. Evaluation and Mitigation of Industrial Fire Hazards. [Internet] [Doctoral dissertation]. University of Lund; 1997. [cited 2019 Oct 18]. Available from: http://lup.lub.lu.se/record/29649 ; http://portal.research.lu.se/ws/files/4374264/2064096.pdf.

Council of Science Editors:

Andersson P. Evaluation and Mitigation of Industrial Fire Hazards. [Doctoral Dissertation]. University of Lund; 1997. Available from: http://lup.lub.lu.se/record/29649 ; http://portal.research.lu.se/ws/files/4374264/2064096.pdf

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