Marianne Gjestvold Omang

• Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold & Reif, Bjørn Anders Pettersson (2020). Particle-resolved simulations of shock-induced flow through particle clouds at different Reynolds numbers. Physical Review Fluids.  ISSN 2469-990X.  5(1) . doi: 10.1103/PhysRevFluids.5.014305 Fulltekst i vitenarkiv.
• Omang, Marianne Gjestvold; Hauge, Knut Ove & Trulsen, Jan Karsten (2019). Exploring the Capability of a New Shock Tube Facility to Investigate Shock Interaction with Inert Particle Columns, In Akihiro Sasoh; Toshiyuki Aoki & Masahide Katayama (ed.),  31st International Symposium on Shock Waves 2: Applications.  Springer Nature.  ISBN 978-3319910161.  Chapter 20.  s 705 - 709
• Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold & Reif, Bjørn Anders Pettersson (2019). Computational analysis of shock-induced flow through stationary particle clouds. International Journal of Multiphase Flow.  ISSN 0301-9322.  114, s 268- 286 . doi: 10.1016/j.ijmultiphaseflow.2019.03.010 Fulltekst i vitenarkiv. Vis sammendrag

  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 trends in mean flow quantities and the unresolved terms in the volume averaged momentum equation, as we vary the three parameters. We find that the shock wave attenuation and certain mean flow trends can be predicted by the opacity of the particle cloud, which is a function of particle size and particle volume fraction. We show that the Reynolds stress field plays an important role in the momentum balance at the particle cloud edges, and therefore strongly affects the reflected shock wave strength. The Reynolds stress was found to be insensitive to particle size, but strongly dependent on particle volume fraction. It is in better agreement with results from simulations of flow through particle clouds at fixed mean slip Reynolds numbers in the incompressible regime, than with results from other shock wave particle cloud studies, which have utilized either inviscid or two-dimensional approaches. We propose an algebraic model for the streamwise Reynolds stress based on the observation that the separated flow regions are the primary contributions to the Reynolds stress.

• Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold & Reif, Bjørn Anders Pettersson (2019). Numerical investigation of shock wave particle cloud interaction in cylindrical geometries, I: Bjørn Helge Skallerud & Helge Ingolf Andersson (red.),  MekIT’19 - 10th National Conference on Computational Mechanics (Trondheim, Norway, 3-4 June 2019).  International Center for Numerical Methods in Engineering (CIMNE).  ISBN 978-84-949194-9-7.  Kapittel.  s 285 - 310
• Omang, Marianne Gjestvold & Trulsen, Jan Karsten (2017). Shock Ignition of Reactive Particles, In Gabi Ben-Dor; Oren Sadot & Ozer Igra (ed.),  30th International Symposium on Shock Waves 1.  Springer.  ISBN 978-3-319-46211-0.  Chapter.  s 771 - 775
• Omang, Marianne Gjestvold & Trulsen, Jan Karsten (2014). Multi-phase shock simulations with smoothed particle hydrodynamics (SPH). Shock Waves.  ISSN 0938-1287.  24(5), s 521- 536 . doi: 10.1007/s00193-014-0506-7
• Omang, Marianne Gjestvold; Christensen, S. O.; Børve, Steinar & Trulsen, Jan Karsten (2009). Height of burst explosions: a comparative study of numerical and experimental results. Shock Waves.  ISSN 0938-1287.  19(2), s 135- 143 . doi: 10.1007/s00193-009-0196-8
• Børve, Steinar; Speith, Roland; Omang, Marianne Gjestvold & Trulsen, Jan Karsten (2007). Challenges related to particle regularization in SPH, In Alejandro J.C. Crespo; Moncho Gómez-Gesteira; Antonio Souto-Iglesias; Louis Delorme & José María Grassa (ed.),  SPHERIC – Smoothed Particle Hydrodynamics European Research Interest Community: SECOND INTERNATIONAL WORKSHOP.  Aica Ediciones.  ISBN 978-84-690-6159-6.  Kapittel.  s 67 - 70
• Omang, Marianne Gjestvold; Børve, Steinar; Christensen, S. O. & Trulsen, Jan Karsten (2007). Symmetry assumptions in SPH, In Alejandro J.C. Crespo; Moncho Gómez-Gesteira; Antonio Souto-Iglesias; Louis Delorme & José María Grassa (ed.),  SPHERIC – Smoothed Particle Hydrodynamics European Research Interest Community: SECOND INTERNATIONAL WORKSHOP.  Aica Ediciones.  ISBN 978-84-690-6159-6.  Kapittel.  s 103 - 106
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan Karsten (2007). Shock collisions in 3D using an axi-symmetric regularized smoothed particle hydrodynamics code. Shock Waves.  ISSN 0938-1287.  16, s 467- 475 . doi: 10.1007/s00193-007-0083-0
• Børve, Steinar; Omang, Marianne Gjestvold & Trulsen, Jan Karsten (2006). Multidimensional MHD Shock Tests of Regularized Smoothed Particle Hydrodynamics. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  652, s 1306- 1317
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan Karsten (2006). Numerical simulations of shock wave reflection phenomena in non-stationary flows using regularized smoothed particle hydrodynamics (RSPH). Shock Waves.  ISSN 0938-1287.  16, s 167- 177 . doi: 10.1007/s00193-006-0061-y
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan (2006). SPH in spherical and cylindrical coordinates. Journal of Computational Physics.  ISSN 0021-9991.  213(1), s 391- 412 . doi: 10.1016/j.jcp.2005.08.023
• Børve, Steinar; Omang, Marianne Gjestvold & Trulsen, Jan (2005). Regularized smoothed particle hydrodynamics with improved multi-resolution handling. Journal of Computational Physics.  ISSN 0021-9991.  208, s 345- 367
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan (2005). Alternative kernel functions for Smoothed Particle Hydrodynamics in cylindrical symmetry. Shock Waves.  ISSN 0938-1287.  14(4), s 293- 298 . doi: 10.1007/s00193-005-0274-5
• Børve, Steinar; Omang, Marianne Gjestvold & Trulsen, Jan (2004). Two-dimensional MHD smoothed particle hydrodynamics stability analysis. Astrophysical Journal Supplement Series.  ISSN 0067-0049.  153, s 447- 462

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• Osnes, Andreas Nygård; Vartdal, Magnus; Reif, Bjørn Anders Pettersson & Omang, Marianne Gjestvold (2019). Shock-induced flow through particle clouds. 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.

• Trulsen, Jan Karsten & Omang, Marianne Gjestvold (2012). Shock propagation through bounded dust clouds.
• Omang, Marianne Gjestvold; Christensen, Svein Olav; Hauge, Knut Ove & Trulsen, Jan Karsten (2011). A numerical and experimental study on charge geometries.
• Omang, Marianne Gjestvold; Christensen, S. O.; Børve, Steinar & Trulsen, Jan Karsten (2010). Blast wave generation and propagation.
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan Karsten (2006). Blast wave simulations with an axis-symmetric RSPH code.
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan Karsten (2006). Shock collision in 3D using Regularized Smoothed Particle Hydrodynamics method for cylinder symmetry.
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan Karsten (2006). Numerical simulations of blast wave interactions with barrier structures using Regularized Smoothed Particle Hydrodynamics (RSPH).
• Omang, Marianne Gjestvold (2005). A Numerical Study of Shock Reflection Phenomena: Exploring the capabilities of Regularized Smoothed Particle Hydrodynamics to handle shock waves.
• Børve, Steinar; Omang, Marianne Gjestvold & Trulsen, Jan (2004). Simulating the Orszag-Tang vortex using RSPH.
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan (2004). Applications of SPH in spherically and cylindrically symmetric systems.
• Omang, Marianne Gjestvold; Børve, Steinar & Trulsen, Jan (2004). Blast type shock phenomena simulated using regularized smoothed particle hydrodynamics.

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