Review and investigations of oscillatory flow behaviour of a horizontal ceiling opening for nuclear containment and fire safety analysis
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P. K. Sharma
, R. K. Singh and A. K. Ghosh
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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© 2011, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Comparison between CAREB code calculations and LOCA test results in the FUMEX III project
- Calculation of moderator circulation in IPHWR using a porosity approach
- Simulation of natural circulation in a rectangular loop using CFD code PHOENICS
- CFD analysis of passive autocatalytic recombiner interaction with atmosphere
- Review and investigations of oscillatory flow behaviour of a horizontal ceiling opening for nuclear containment and fire safety analysis
- CFD simulation of thermal discharge behaviour in the Kadra reservoir at the Kaiga atomic power station
- Inverse problems using Artificial Neural Networks in long range atmospheric dispersion
- Sipping tests for the irradiated fuel elements of the TR-2 research reactor
- Neutron multiplication in source driven subcritical nuclear systems
- Cyclotron production of 101Pd/101mRh radionuclide generator for radioimmunotherapy
- Investigation of cross sections of reactions used in neutron activation analysis
- Modified UN method for the reflected critical slab problem with forward and backward scattering