Browsing by Author "Osnes, Andreas Nygård"
Now showing items 1-10 of 10
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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 ... -
An operational dispersion model for wind over swell seas
Åkervik, Espen; Osnes, Andreas Nygård (2024-07-04)In this report, we develop an operational contaminant transport model suitable for offshore conditions. Although the model is, in principle, independent of sea state, we expect it to be most useful for swell sea calculations, ... -
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 ...