Now showing items 1-20 of 33

  • Sutherland, Graig J.; Rabault, Jean; Christensen, Kai Håkon; Jensen, Atle (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Sea ice is highly complex due to the inhomogeneity of the physical properties (e.g. temperature and salinity) as well as the permeability and mixture of water and a matrix of sea ice and/or sea ice crystals. Such complexity ...
  • Jensen, Atle; Sveen, Johan Kristian; Clamond, Didier; Grue, John (Research report / Forskningsrapport, 1999)
  • Rabault, Jean; Kuchta, Miroslav; Jensen, Atle; Reglade, Ulysse; Cerardi, Nicolas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We present the first application of an Artificial Neural Network trained through a Deep Reinforcement Learning agent to perform active flow control. It is shown that, in a 2D simulation of the Kármán vortex street at ...
  • Sutherland, Graigory John; Halsne, Trygve; Rabault, Jean; Jensen, Atle (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    The attenuation of surface gravity waves is an important process associated with air–sea and wave–current interactions. Here we investigate experimentally the attenuation of monochromatic surface gravity waves due to the ...
  • Dong, Tao; Shi, Zhongyuan; Jensen, Atle (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
    Cone shaped pin fin with curved profile and uniform base heat flux was investigated. The result from simultaneous optimization in regard of fin efficiency and total volume is presented. The profile is represented by the ...
  • Kolaas, Jostein; Riise, Bjørn; Sveen, Kristian; Jensen, Atle (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    The present paper provides an introduction to bichromatic synthetic schlieren (BiCSS) for surface measurements, a novel extension of the free surface synthetic schlieren (FS-SS) by Moisy et al. (Exp Fluids 46:1021–1036, ...
  • Kolaas, Jostein; Smith, Lisa; Jensen, Atle; Sveen, Johan Kristian (Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2016)
    We introduce Bichromatic Synthetic Schlieren (BiCSS) for instantaneous surface measurements, in where we use two simultaneous images taken at blue and near infrared wavelengths, making use of that refractive index variation ...
  • Ayati, Anis Awal; Vollestad, Petter; Jensen, Atle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Stratified air-water flow in a horizontal pipe is investigated experimentally using particle image velocimetry and conductance probes. This flow regime is characterized by a complex interplay between a turbulent airflow ...
  • Ayati, Anis Awal; Vollestad, Petter; Jensen, Atle (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Stratified air-water flow in a horizontal pipe is investigated experimentally using particle image velocimetry and conductance probes. This flow regime is characterized by a complex interplay between a turbulent airflow ...
  • Vollestad, Petter; Ayati, Anis Awal; Angheluta, Luiza; Lacasce, Joseph Henry; Jensen, Atle (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    We investigate the effect of waves on the airflow in horizontal two-phase pipe flow. Velocity fields in the gaseous phase were acquired by particle image velocimetry (PIV), while interfacial elevation was measured with ...
  • Vollestad, Petter; Jensen, Atle; Ayati, Anis Awal (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
  • Jensen, Atle; Pedersen, Geir Kleivstul; Wood, Deborah J. (Research report / Forskningsrapport, 2001)
    This paper focus on experiments on run-up of strongly nonlinear waves on a moderately steep beach of 10.5deg inclination. Velocity fields are obtained by the PIV (Particle Image Velocimetry) technique. Acceleration ...
  • Ramirez De La Torre, Reyna Guadalupe; Jensen, Atle; Kuchta, Miroslav (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The process of a circular free falling jet entering an idle pool was studied with the objective of determining a relation between the naturally occurring disturbances on the jet surface and air entrainment. To this end the ...
  • Rabault, Jean; Sutherland, Graig J.; Jensen, Atle; Christensen, Kai Håkon; Marchenko, Aleksey (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Water wave attenuation by grease ice is a key mechanism for the polar regions, as waves in ice influence many phenomena such as ice drift, ice breaking and ice formation. However, the models presented so far in the literature ...
  • Smith, Lisa; Jensen, Atle; Pedersen, Geir Kleivstul (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2016)
    This study presents an experimental investigation of plunging breakers on a sloping beach with an inclination of 5.1°. The incident waves are solitary waves with various amplitudes from non-breaking waves to plunging ...
  • Carr, Magda; Sutherland, P.; Haase, A.; Evers, K.-U.; Fer, Ilker; Jensen, Atle; Kalisch, Henrik; Berntsen, Jarle; Parau, E.; Thiem, Ø.; Davies, P.A. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Internal solitary waves (ISWs) propagating in a stably stratified two‐layer fluid in which the upper boundary condition changes from open water to ice are studied for grease, level, and nilas ice. The ISW‐induced current ...
  • Grafsrønningen, Stig; Jensen, Atle (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    Large eddy simulations of a buoyant plume forming above a heated horizontal cylinder with a Rayleigh number of 9.4E7 is carried out and compared with experimental data. Natural convection heat transfer from a horizontal ...
  • Taklo, Tore Magnus Arnesen; Trulsen, Karsten; Gramstad, Odin; Krogstad, Harald E; Jensen, Atle (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2015)
    We report laboratory experiments and numerical simulations of the Zakharov equation, designed to have sufficient resolution in space and time to measure the dispersion relation for random surface gravity waves. The experiments ...
  • Sveen, Johan Kristian; Jensen, Atle; Grue, John (Research report / Forskningsrapport, 1998)
  • Rabault, Jean; Sutherland, Graigory John; Gundersen, Olav; Jensen, Atle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Versatile instruments assembled from off-the-shelf sensors and open-source electronics are used to record wave propagation and damping measured by Inertial Motion Units (IMUs) in a grease ice slick near the shore in ...