Blar i NTNU Open på forfatter "Nordam, Tor"
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Modelling biodegradation of crude oil components at low temperatures
Nordam, Tor; Lofthus, Synnøve; Brakstad, Odd Gunnar (Journal article; Peer reviewed, 2020)For oil spilled at sea, the main weathering processes are evaporation, emulsification, photo-oxidation, dispersion and biodegradation. Of these, only biodegradation may completely remove hydrocarbons from the environment ... -
Modelling of oil thickness in the presence of an ice edge
Nordam, Tor; Litzler, Emma; Skancke, Jørgen; Singsaas, Ivar; Leirvik, Frode; Johansen, Øistein (Peer reviewed; Journal article, 2020)Oil slick thickness is a key parameter for the behaviour of oil spilled at sea. It influences evaporation and entrainment, viable response options, and the risk to marine life at the surface. Determining this value is ... -
Numerical analysis of boundary conditions in a Lagrangian particle model for vertical mixing, transport and surfacing of buoyant particles in the water column
Nordam, Tor; Kristiansen, Ruben; Nepstad, Raymond; Röhrs, Johannes (Journal article; Peer reviewed, 2019)Lagrangian particle models are used for many applications in the ocean sciences, including transport modelling of oil spills, fish eggs and larvae, plastics, and sediment particles. In the context of oil spill modelling, ... -
Numerical Integration and Interpolation in Marine Pollutant Transport Modelling
Nordam, Tor; Brönner, Ute; Skancke, Jørgen; Nepstad, Raymond; Rønningen, Petter; Alver, Morten (Chapter, 2018) -
Numerical integrators for Lagrangian oceanography
Nordam, Tor; Duran, Rodrigo (Peer reviewed; Journal article, 2020)A common task in Lagrangian oceanography is to calculate a large number of drifter trajectories from a velocity field pre-calculated with an ocean model. Mathematically, this is simply numerical integration of an Ordinary ... -
Numerical Simulations of Scattering of Light from Two-Dimensional Rough Surfaces Using the Reduced Rayleigh Equation
Simonsen, Ingve; Nordam, Tor; Letnes, Paul Anton (Journal article; Peer reviewed, 2013)A formalism is introduced for the non-perturbative, purely numerical, solution of the reduced Rayleigh equation (RRE) for the scattering of light from two-dimensional penetrable rough surfaces. Implementation and performance ... -
Numerical studies of the scattering of light from a two-dimensional randomly rough interface between two dielectric media
Hetland, Øyvind Storesund; Maradudin, Alexei A.; Nordam, Tor; Simonsen, Ingve (Journal article; Peer reviewed, 2016)The scattering of polarized light incident from one dielectric medium on its two-dimensional randomly rough interface with a second dielectric medium is studied. A reduced Rayleigh equation for the scattering amplitudes ... -
Numerical studies of the transmission of light through a two-dimensional randomly rough interface
Hetland, Øyvind Storesund; Maradudin, Alexei A.; Nordam, Tor; Letnes, Paul Anton; Simonsen, Ingve (Journal article; Peer reviewed, 2017)The transmission of polarized light through a two-dimensional randomly rough interface between two dielectric media has been much less studied, by any approach, than the reflection of light from such an interface. We have ... -
OC2017 A-181 - Numerical modelling of (thin) oil films - Improved behaviour and life time of thin films in the OSCAR model
Brönner, Ute; Lewis, Alun; Johansen, Øistein; Nordam, Tor (Research report, 2017)The PETRO MAKS project "Formation and behaviour of thin oil films and evaluation of response methods including HSE", in the following short "Thin oil films" has the objective to achieve new knowledge more efficient and ... -
Oil Spill Contingency and Response Modelling in Ice-Covered Waters
Nordam, Tor; Litzler, Emma; Rønningen, Petter; Aune, Joakim; Hagelien, Thomas Fjæstad; Beegle-Krause, Cynthia Juyne; Brönner, Ute (Chapter, 2018) -
On the use of random walk schemes in oil spill modelling
Nordam, Tor; Nepstad, Raymond; Litzler, Emma; Röhrs, Johannes (Journal article; Peer reviewed, 2019)In oil spill models, vertical mixing due to turbulence is commonly modelled by random walk. If the eddy diffusivity varies with depth, failing to take the derivative of the diffusivity into account in the random walk scheme ... -
Parallell partikkeltransport implementert i Python med MPI
Mikkelsen, Simen (Master thesis, 2017)Det er skrevet et program i Python for å beregne parallell partikkeltransport. Som numerisk integrator ble fjerdeordens Runge-Kutta-metode brukt for å beregne partikkeltransporten i et hastighetsfelt gitt ved et analytisk ... -
Satellite peaks in the scattering of light from the two-dimensional randomly rough surface of a dielectric film on a planar metal surface
Nordam, Tor; Letnes, Paul Anton; Simonsen, Ingve; Maradudin, Alexei A. (Journal article; Peer reviewed, 2012)A nonperturbative, purely numerical, solution of the reduced Rayleigh equation for the scattering of p- and s-polarized light from a dielectric film with a two-dimensional randomly rough surface deposited on a planar ... -
Scattering of light from weaklyrough surfaces
Nordam, Tor (Doktoravhandlinger ved NTNU, 1503-8181; 2013:47, Doctoral thesis, 2013)A formalism is introduced for the non-perturbative, purely numerical, solution of the reduced Rayleigh equation for the scattering of light from two-dimensional penetrable rough surfaces. In the papers included in this ... -
Simulation methods for granular gas dynamics in periodic three-dimensional systems
Gjersvoll, Aleksander (Master thesis, 2020)I denne masteroppgåva studerar me granulær gassdynamikk, der me har antatt at dynamikken til ein granulær gass er bestemt av momentane parvise uelastiske partikkelkollisjonar, og kollisjonane er gitt av ein konstant ... -
Stochastic particle methods for diffusion problems in breaking waves
Jervell, Konrad (Master thesis, 2023)Det har vorte gjort ei samanlikning av ein enkel refleksjonsmetode og ein meir involvert metode presentert av Lépingle (1995) i virrevandringsmetodar. Det vart funne at Lépingle-metoden, i tillegg til å vere berekningsmessig ... -
Studies of turbulent diffusion through direct numerical simulation
Halvorsen, Daniel Ørnes (Master thesis, 2020)I denne mastergraden ble en tredimensjonal løser for direkte numerisk simulasjon implementert ved bruk av en spektralmetode, og parallellisert ved bruk av en penn-dekomposisjon, med hensikt å studere den superdiffusive ... -
The effect of vertical mixing on the horizontal drift of oil spills
Röhrs, Johannes; Dagestad, Knut-Frode; Asbjørnsen, Helene; Nordam, Tor; Skancke, Jørgen; Jones, Cathleen; Brekke, Camilla (Journal article; Peer reviewed, 2018)Vertical and horizontal transport mechanisms for marine oil spills are investigated using numerical model simulations. To realistically resolve the 3-D development of a spill on the ocean surface and in the water column, ... -
Theoretical and computational studies of the scattering of light from randomly rough dielectric surfaces
Hetland, Øyvind Storesund (Doctoral theses at NTNU;2019:45, Doctoral thesis, 2019)We are surrounded by light being scattered from surfaces all around us, both natural and man-made. Improving our understanding of exactly how light (and more generally, electromagnetic waves) interacts with and scatters ...