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      Review and investigations of oscillatory flow behaviour of a horizontal ceiling opening for nuclear containment and fire safety analysis Translated title: Untersuchung und Bewertung des oszillatorischen Strömungsverhaltens einer horizontalen Deckenöffnung für die Brandanalyse und die Analyse des Containments

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      1 , * , , 1 , 1
      Kerntechnik
      Carl Hanser Verlag

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          Abstract

          In the thermal hydraulics codes developed for fire safety analysis and for containment thermal hydraulic analysis, junctions in the multi-compartment geometries is often modeled as uni-directional junctions. However, ceiling junctions are known to depict unstable/oscillatory bi-directional flow behavior. Detailed investigations have been carried out to understand the unstable flow behaviour of a junction by analyzing an earlier reported experiment and its subsequent two dimensional numerical RANS based study of fire in an enclosure. The authors attempt more realistic and desired three dimensional and inherently transient large eddy simulations using a computer code Fire Dynamics Simulator (FDS). The paper presents the details of the analysis, the results obtained and further studies required to be conducted so that the findings can be applied to the fire/containment thermal hydraulics analysis codes successfully.

          Kurzfassung

          In den Thermohydraulik-Rechencodes, die für die Brandanalyse und für die thermohydraulische Analyse des Containments entwickelt wurden, werden die Nahtstellen in den Multi-Kompartment-Geometrien oft als unidirektionale Übergänge modelliert. Deckenanschlüsse zeigen jedoch instabiles/oszillatorisches Strömungsverhalten. Detaillierte Untersuchungen wurden durchgeführt um das instabile Strömungsverhalten der Anschlüsse zu verstehen. Dabei wurde ein früheres Experiment analysiert und die darauf folgende zweidimensionale numerische RANS-basierte Studie eines Brandes in einem Gehäuse. Die Autoren führen realistischere, dreidimensionale und inherent transiente Grobstruktursimulationen mit Hilfe des Rechencodes Fire Dynamics Simulator (FDS) durch. Die vorliegende Arbeit stellt die Einzelheiten der Analyse dar, die erhaltenen Ergebnisse und beschreibt weitere Untersuchungen, die erforderlich sind damit die Ergebnisse erfolgreich auf die Rechencodes für die Brandanalyse und die Analyse des Containments angewendet werden können.

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          Most cited references3

          • Record: found
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          Characteristics of buoyancy-driven interzonal airflow via horizontal openings

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            An Experimental Investigation of Some Further Aspects of the Buoyancy-Driven Exchange Flow between Carbon Dioxide and Air following a Depressurization Accident in a Magnox Reactor, Part Part: The Exchange Flow in Inclined Ducts

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              A one-dimensional Lagrangian model for large-volume mixing

                Author and article information

                Journal
                kt
                Kerntechnik
                Carl Hanser Verlag
                0932-3902
                2195-8580
                2011
                : 76
                : 2
                : 104-110
                Affiliations
                1 Reactor Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085
                Author notes
                Article
                KT110121
                10.3139/124.110121
                84b3f622-2bd4-4bd8-8ffa-609776b47ac9
                © 2011, Carl Hanser Verlag, München
                History
                : 20 September 2010
                Page count
                References: 27, Pages: 7
                Categories
                Technical Contributions/Fachbeiträge

                Materials technology,Materials for energy,Nuclear physics
                Materials technology, Materials for energy, Nuclear physics

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