Browsing by Author "Osnes, Andreas Nygård"
Now showing items 1-9 of 9
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Comprehensive quasi-steady force correlations for compressible flow through random particle suspensions
Osnes, Andreas Nygård; Vartdal, Magnus; Khalloufi, Mehdi; Capecelatro, Jesse; Balachandar, S. (2023-04-26)Models for quasi-steady drag, quasi-steady drag variation, and transverse forces for compressible flows through random, fixed, particle suspensions are presented. Correlations are formulated using drag force measurements ... -
Computational analysis of shock-induced flow through stationary particle clouds
Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold; Reif, Bjørn Anders Pettersson (2019-03-22)We investigate the shock-induced flow through random particle arrays using particle-resolved Large Eddy Simulations for different incident shock wave Mach numbers, particle volume fractions and particle sizes. We analyze ... -
Evaluation of safety distances for storage of explosive materials using a combination of thermochemical computations and CFD
Fossum, Hannibal Eie; Osnes, Andreas Nygård; Kristensen, Tor Erik (2019-01-14)A novel approach to calculating TNT equivalencies and safety distances for explosives, using a combination of thermochemical computations and computational fluid dynamics, is presented. This enables the estimation of safety ... -
Large-eddy simulation of dense gas dispersion over a simplified urban area
Wingstedt, Emma My Maria; Osnes, Andreas Nygård; Åkervik, Espen; Eriksson, Daniel; Reif, Bjørn Anders Pettersson (2017)Dispersion of neutral and dense gas over a simplified urban area, comprising four cubes, has been investigated by the means of large-eddy simulations (LES). The results have been compared to wind tunnel experiments and ... -
Linear motion of multiple superposed viscous fluids
Vartdal, Magnus; Osnes, Andreas Nygård (2019-04-16)In this paper the small-amplitude motion of multiple superposed viscous fluids is studied as a linearized initial-value problem. The analysis results in a closed set of equations for the Laplace transformed amplitudes of ... -
Particle-resolved simulations of shock-induced flow through particle clouds at different Reynolds numbers
Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold; Reif, Bjørn Anders Pettersson (2020-01-27)This study investigates the Reynolds-number dependence of shock-induced flow through stationary particle clouds at 10% volume fraction, using ensemble-averaged results from three-dimensional particle-resolved large eddy ... -
Performance of drag force models for shock-accelerated flow in dense particle suspensions
Osnes, Andreas Nygård; Vartdal, Magnus (2021-04)Models for prediction of drag forces within a particle cloud following shock-acceleration are evaluated with the aid of results from particle-resolved simulations in order to quantify how much the disturbances introduced ... -
Safe storage of ammonium nitrate products –scientific framework for government regulations
Kristensen, Tor Erik; Osnes, Andreas Nygård (2022-10-27)Ammonium nitrate (AN) is a solid chemical compound of paramount significance in the field of agriculture, as a high-nitrogen fertilizer component, and in the formulation of blasting explosives having major civilian ... -
Testing a simple velocity fluctuation model for one-dimensional simulations of shock-wave particle cloud interaction
Lotsberg, Bernhard Nornes; Osnes, Andreas Nygård (2020-06-17)Airborne dispersal of toxic substancres in populated regions is a central research topic at the Norwegian Defence Research Establishment (FFI). Such an event can be the result of accidents in industrial areas or during ...