Browsing by Author "Reif, Bjørn Anders Pettersson"
Now showing items 21-33 of 33
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Post-blast explosive residue-a review of formation and dispersion theories and experimental research
Abdul-Karim, Nadia; Blackman, Christopher S.; Gill, Philip P.; Wingstedt, Emma My Maria; Reif, Bjørn Anders Pettersson (2014)The presence of undetonated explosive residues following high order detonations is not uncommon, however the mechanism of their formation, or survival, is unknown. The existence of these residues impacts on various scenarios, ... -
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 ... -
Tracking airborne Legionella and Legionella pneumophila at a biological treatment plant
Blatny, Janet Martha; Reif, Bjørn Anders Pettersson; Skogan, Gunnar; Andreassen, Øyvind; Høiby, Ernst Arne; Ask, Eirik; Waagen, Viggo; Aanonsen, Dag; Aaberge, Ingeborg Aase S.; Caugant, Dominique A (2008)Biological treatment plants are frequently used to degrade organic substances in wastewater from wood refinement processes. Aeration ponds in such plants provide an optimal growth environment for many microorganisms, ... -
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 ... -
Variational multiscale turbulence modeling in a high-order spectral element method
Gjesdal, Thor; Wasberg, Carl Erik; Reif, Bjørn Anders Pettersson; Andreassen, Øyvind (2006)One of the more promising recent approaches to turbulence modelling is the Variational Myltiscale Large Eddy Simulation (VMS LES) method proposed by Hughes et al.[Comp. Visual. Sci., vol 3, pp 47-59, 2000]. This method avoids ...