Browsing Rapporter by Author "Reif, Bjørn Anders Pettersson"
Now showing items 1-20 of 21
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Computational fluid dynamics simultations of flow and dispersion in the aerosol test chamber
Fossum, Hannibal E.; Reif, Bjørn Anders Pettersson (2012-10-19)This report presents findings from computer simulations of the air flow and the dispersion of aerosols inside a rectangular 12 m3 Aerosol Test Chamber. Methodologically, the Large Eddy Simulation approach is used, in ... -
Hydrodynamical simulations in FLUENT
Wasberg, Carl Erik; Reif, Bjørn Anders Pettersson (2010)A methodology for hydrodynamical simulations in FLUENT is described. The current application is the computational fluid dynamics analyses of two- and three-dimensional wings conducted as part of an underwater towing ... -
The impact of flow noise on towed and hull mounted acoustical sensors : an introductory study
Reif, Bjørn Anders Pettersson; Andreassen, Øyvind (2004)In this introductory study we have assessed the impact of turbulence generated wall-pressure fluctuations on surfacemounted acoustical sensors, with a special focus on towed sonar arrays. The main findings are that the ... -
Implementation of a new and improved evaporation model in Fluent
Vik, Thomas; Reif, Bjørn Anders Pettersson (2011-01-13)The release and dispersion of toxic chemicals can cause a threat to military personnel and the population at large. In order to develop and implement appropriate protective capabilities and plan mitigating measures, ... -
Modeling the evaporation from a thin liquid surface beneath a turbulent boundary layer
Vik, Thomas; Reif, Bjørn Anders Pettersson (2010)The release and dispersion of toxic chemicals can cause a threat to military personnel and the population at large. In order to develop and implement appropriate protective capabilities and plan mitigating measures, ... -
A modelling study of the flow pattern in a rotating drum for aerosol aging
Reif, Bjørn Anders Pettersson; Wingstedt, Emma M. M.; Pedersen, Kristin (2009)Aerosols are small droplets or particles suspended in a gas and they can contain microorganisms or other harmful substances. It is therefore of great importance to gain more knowledge about them, for example their survival ... -
MODITIC : modelling the dispersion of toxic industrial chemicals in urban environments
Endregard, Monica; Burkhart, Stephane; Burman, Jan; Gentilhomme, Olivier; Robins, Alan; Wingstedt, Emma M. M.; Reif, Bjørn Anders Pettersson; Persson, Leif; Brännström, Niklas; Parmhed, Oskar (2016-10-13)The main objective of the MODITIC (Modelling the disperison of toxic industrial chemicals in urban environments) project is to enhance our fundamental understanding of the physical processes and the associated challenges ... -
Numerical simulations of flow-induced vibrations on Orion P-3C
Reif, Bjørn Anders Pettersson; Wasberg, Carl Erik (2003)The radome mounted on the Orion P-3C has a significant adverse impact on the performance of the aircraft. Measurements have revealed low-frequency vibrations so severe that operational restrictions have been imposed. ... -
Numerical simulations of particle dispersion in an urban area
Wingstedt, Emma M. M.; Reif, Bjørn Anders Pettersson (2012-06-27)In this study the transport and deposition of particles released from different source locations, and with different wind conditions, in a realistic urban area have been investigated. Two different scenarios have been ... -
Påvisning av Legionella spp. i luft ved Borregaard
Blatny, Janet Martha; Skogan, Gunnar; Reif, Bjørn Anders Pettersson (2007)Rapporten beskriver et samarbeidsprosjekt mellom Forsvarets forskningsinstitutt (FFI), Folkehelseinstituttet, Telelab AS og Borregaard for å undersøke om ����� legionellabakterier kan påvises i luft ����� legionellabakterier ... -
Preliminary assessment of the vertical release of liquefied chlorine inside a depression
Vik, Thomas; Reif, Bjørn Anders Pettersson (2009)Toxic industrial chemicals (TICs) are used in most places and can pose a threat due to accidents, terror, or sabotage. Many of the most common TICs are gasses at ambient atmosphere, such as chlorine, ammonia, and sulfur ... -
Preliminary numerical simulation of the dispersion of chlorine vapour in a mock urban environment for the Jack Rabbit II field trials
Vik, Thomas; Wingstedt, Emma M. M.; Reif, Bjørn Anders Pettersson (2016-02-02)The release and dispersion of toxic industrial chemicals as a result of accidents, terrorism, or sabotage represent a possible hazard for life and health. Such chemicals are often transported and stored as condensed ... -
Sampling and identification of Legionella spp. at Borregaard Ind. Ltd.
Blatny, Janet Martha; Skogan, Gunnar; Reif, Bjørn Anders Pettersson; Andreassen, Øyvind; Thomassen, Gunn Merethe; Aarskaug, Tone; Fykse, Else Marie; Olsen, Jaran Strand (2007)Befolkningen i Sarpsborg/Fredrikstad-området opplevde et utbrudd forårsaket av Legionella pneumophila serogruppe 1 i mai 2005 hvor 56 personer ble registrert smittet. Skrubberanlegget ved Borregaard i Sarpsborg ble ... -
Simulation of bomb residue deposition following the Oslo bombing July 22, 2011
Wingstedt, Emma M. M.; Fossum, Hannibal E.; Reif, Bjørn Anders Pettersson (2012-11-16)The objective of the present study is to simulate the dispersion and make an assessment on the shape and concentration of the deposition of particle residues originating from the improvised explosive device used on July ... -
Simulations of the release and dispersion of chlorine and comparison with the Jack Rabbit field trials
Vik, Thomas; Tørnes, John Aasulf; Reif, Bjørn Anders Pettersson (2015-10-07)The release and dispersion of toxic industrial chemicals as a result of accidents, terrorism or sabotage, represents a possible hazard. Such chemicals are often transported and stored as condensed liquids in pressurized ... -
Spectral element benchmark simulations of natural convection in two-dimensional cavities
Gjesdal, Thor; Wasberg, Carl Erik; Reif, Bjørn Anders Pettersson (2004)This report presents the results of spectral element simulations of natural convection in two-dimensional cavities. In particular, a detailed comparison is performed with the reference data recently described by Christon ... -
Studies of aerodynamically induced vibrations on the P-3Cmaritime surveillance aircraft and proposed vibration reducing measures
Andreassen, Øyvind; Wasberg, Carl Erik; Helgeland, Anders; Tutkun, Murat; Kielland, Jan Charles; Reif, Bjørn Anders Pettersson; Skaugen, Atle (2013-01-31)After installation of a radome on the P-3C aircraft, vibrations occur in flight that were not present earlier. The vibrations are specially noticeable at high airspeeds. The cause of the vibrations is confirmed to be ... -
A theoretical study of small scale turbulence in stratified turbulent shear flows
Reif, Bjørn Anders Pettersson; Andreassen, Øyvind (2004)This report examines the postulate of local isotropy in stratified homogeneous turbulence from a theoretical point of view. The study is based on a priori analysis of the evolution equations governing single-point turbulence ... -
Transport and dispersion of non-neutral toxic industrial chemicals in an urban environment
Wingstedt, Emma M. M.; Vik, Thomas; Reif, Bjørn Anders Pettersson (2012-08-31)The main focus in this study was to investigate the difference between the dispersion and transport process of non-neutral and passive gas release, respectively, in an urban area. The method used was the LES approach, ... -
Turbulent strømning og fordampning av væske i sjakt
Vik, Thomas; Reif, Bjørn Anders Pettersson; Martinussen, Kim Åge (2008)Formålet med denne studien er å bidra til bedre forståelse og grunnleggende kunnskap om hvordan kjemiske trusselstoffer oppfører seg ved utslipp og hvordan de spres i luft. Slik kunnskap er et avgjørende grunnlag for ...