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(2018).
Analysis of carrier phase fluctuations during the passage of a shock wave through a particle cloud.
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(2016).
Jetting instability of a shocked cylindrical shell of solid particles.
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Wingstedt, Emma My Maria; Eriksson, Daniel; Parmhed, Oskar; Leroy, Guillaume; Osnes, Andreas Nygård & Reif, Bjørn Anders Pettersson
(2016).
MODITIC - Large-eddy simulations of dispersion of neutral and non-neutral scalar fields in complex urban-like geometries.
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Endregard, Monica; Burkhart, Stephane; Burman, Jan; Gentilhomme, Olivier; Robins, Alan & Wingstedt, Emma My Maria
[Vis alle 12 forfattere av denne artikkelen]
(2016).
MODITIC - Modelling the dispersion of toxic industrial chemicals in urban environments.
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(2014).
Numerical Simulation of the Dispersion of Chlorine Following the Release from a Pressurized Tank.
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Wingstedt, Emma My Maria; Fossum, Hannibal Eie & Reif, Bjørn Anders Pettersson
(2013).
Modelling the viscous dissipation rate in stably stratified turbulence.
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(2013).
Evaporation of a thin liquid surface beneath a turbulent boundary layer.
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Vik, Thomas; Wingstedt, Emma My Maria; Tørnes, John Aasulf; Reif, Bjørn Anders Pettersson & Endregard, Monica
(2013).
Numerical simulations of the dispersion of non-neutral toxic industrial chemicals in an urban environment.
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Vik, Thomas; Wingstedt, Emma My Maria & Reif, Bjørn Anders Pettersson
(2012).
Numerical simulation of the dispersion of ammonia in complex urban environment.
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Grafsrønningen, Stig; Jensen, Atle & Reif, Bjørn Anders Pettersson
(2012).
PIV investigation of a buoyant plume above heated horizontal cylinder.
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(2011).
Large eddy simulations of the release of liquified chlorine from a pressurized tank into the atmosphere.
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(2011).
Large Eddy Simulations of the Release of Liquified Chlorine from a Pressurized Tank into the Atmosphere.
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(2009).
Large eddy simulations of the evaporation from a liquid pool beneath a turbulent air flow.
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(2009).
CFD simulations of the evaporation from a liquid pool in a turbulent flow.
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Endregard, Monica; Reif, Bjørn Anders Pettersson; Vik, Thomas & Busmundrud, Odd
(2009).
Consequence management challenges after indoor dispersion of a toxic chemical.
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Elboth, Thomas; Andreassen, Øyvind & Reif, Bjørn Anders Pettersson
(2008).
Experiments and simulations of flow noise inside a cylinder aligned with the flow.
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Mortensen, Mikael; Reif, Bjørn Anders Pettersson & Langer, Carlos A.
(2008).
Modelling adverse pressure-gradient boundary layers using the nonlinear V2F model in combination with a structure based model.
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Helgeland, Anders; Andreassen, Øyvind; Ommundsen, Atle; Reif, Bjørn Anders Pettersson; Werne, Joseph & Gaarder, Trond
(2004).
Visualization of the energy-containing turbulent scales.
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Osnes, Andreas Nygård; Vartdal, Magnus; Reif, Bjørn Anders Pettersson & Omang, Marianne Gjestvold
(2019).
Shock-induced flow through particle clouds.
Universitetet i Oslo.
Vis sammendrag
High-speed flows through dense particle clouds occur in many technological applications such as explosion mitigation systems, combustion engines, drug-delivery systems, as well as natural phenomena such as volcanic eruptions and meteoroid breakup. This thesis studies such flows by means of numerical simulations.
Typical flows of interest feature trillions of particles, and it is therefore necessary to use simplified models to describe the behaviour of the particles and the flow around them. In this thesis, we use very large, accurate, simulations to study the details of shock-induced flows with a moderate number of particles. In addition, full-scale simulations with a large number of particles are used to determine the sensitivity of such simulations to modelling choices.
The simulations with few particles show that high particle concentration necessitates modifications to the drag-laws and flow model approximations that are used to simulate full-scale problems. Small-scale flow fluctuations affect the average flow statistics, and must be modelled in simulations where they are not directly captured.
The full-scale simulations show that the shock-accelerated particles self-organise and form particle jets, in agreement with experiments. To capture this process, the simulations must account for the interchange of momentum and energy between the particles and the surrounding air.