Knut Erik Teigen Giljarhus | University of Stavanger

99265474

Faculty of Science and Technology
Department of Mechanical and Structural Engineering and Materials Science

KE E-241

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Bio

Knut Erik is an associate professor within the field of computational fluid dynamics. He holds a PhD from the Norwegian University of Science and Technology. His thesis dealt with the development of models for separation of water from oil by means of an electrical field including surface-active agents. After his PhD he worked for SINTEF Energy, primarily with the development of a method for fluid-structure interaction in CO2 pipelines. In 2012 he started working for Lloyd's Register with simulations of gas dispersion, fires and explosions. Here, he was also acting as technical lead for the consequence modelling group. He started teaching at the University of Stavanger in 2014 and in 2018 he started a full position as an associate professor at the department of mechanical and structual engineering and materials science. Since 2020, he is study program leader for the mechanical engineering study programs.

His research interests include:

Computational fluid dynamics
Multiphase flow
Aerodynamics
Turbulence modelling

Publications

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Vitenskapelige publikasjoner
- Ghorbani, Maryam; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim
  
  (2024)
  Influence of Viscosity on Density-Unstable Fluid-Fluid Displacement in Inclined Eccentric Annuli. I: Advances in Computational Mechanics and Applications.
  Springer.
  
  ISBN 978-3-031-49791-9.
  
  s.280-297.
  
  DOI: 10.1007/978-3-031-49791-9_20
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen
  
  (2024)
  Sensitivity of urban morphology and the number of CFD simulated wind directions on pedestrian wind comfort and safety assessments.
  Building and Environment.
  
  ISSN 0360-1323.
  
  Volum 253.
  
  DOI: 10.1016/j.buildenv.2024.111310
- Giljarhus, Knut Erik Teigen; Hågbo, Trond-Ola
  
  (2024)
  Simulation-Based Data-Driven Wind Engineering—Analyzing the Influence of Building Proximity and Skyways on Pedestrian Comfort. I: Advances in Computational Mechanics and Applications.
  Springer.
  
  ISBN 978-3-031-49791-9.
  
  DOI: 10.1007/978-3-031-49791-9_17
- Rasooli, Reza; Holmstrøm, Henrik; Giljarhus, Knut Erik Teigen; Jolma, Ingunn Westvik; Vinningland, Jan Ludvig; De Lange, Charlotte; Brun, Henrik; Hiorth, Aksel
  
  (2024)
  In vitro hemodynamic performance of a blood pump for self-powered venous assist in univentricular hearts.
  Nature Scientific Reports.
  
  DOI: 10.1038/s41598-024-57269-7
- Venkatraman, Kartik; Hågbo, Trond-Ola; Buckingham, Sophia; Giljarhus, Knut Erik Teigen
  
  (2023)
  Effect of different source terms and inflow direction in atmospheric boundary modeling over the complex terrain site of Perdigão.
  Wind Energy Science.
  
  ISSN 2366-7443.
  
  Volum 8.
  
  Hefte 1.
  
  s.85-108.
  
  DOI: 10.5194/wes-8-85-2023
- Rasooli, Reza; Giljarhus, Knut Erik Teigen; Hiorth, Aksel; Jolma, Ingunn Westvik; Vinningland, Jan Ludvig; de Lange, Charlotte; Brun, Henrik; Holmstrøm, Henrik
  
  (2023)
  In Silico Evaluation of a Self-powered Venous Ejector Pump for Fontan Patients.
  Cardiovascular Engineering and Technology.
  
  ISSN 1869-408X.
  
  Volum 14.
  
  Hefte 3.
  
  s.428-446.
  
  DOI: 10.1007/s13239-023-00663-5
- Giljarhus, Knut Erik Teigen; Liland, Fredrik Fang; Oggiano, Luca
  
  (2023)
  Virtual skeleton methodology for athlete posture modification in CFD simulations.
  Sports Engineering.
  
  ISSN 1369-7072.
  
  Volum 26.
  
  DOI: 10.1007/s12283-023-00430-8
- Ghorbani, Maryam; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim
  
  (2023)
  Influence of fluid viscosity hierarchy on the reverse-circulation displacement efficiency.
  Geoenergy Science and Engineering.
  
  ISSN 2949-8929.
  
  Volum 234.
  
  DOI: 10.1016/j.geoen.2023.212600
- Shaukat, Usman; Schnepf, Anja; Giljarhus, Knut Erik Teigen
  
  (2023)
  Flow over a step cylinder using partially-averaged Navier-Stokes equations with application towards dynamic subsea power cables.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 1294.
  
  DOI: 10.1088/1757-899X/1294/1/012002
- Schnepf, Anja; Giljarhus, Knut Erik Teigen; Johnsen, Øyvind; Lopez-Pavon, Carlos
  
  (2023)
  Dynamic Power Cable Configuration Design for Floating Offshore Wind Turbines Using Gradient-Based Optimization. I: ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. Volume 8: Ocean Renewable Energy.
  The American Society of Mechanical Engineers (ASME).
  
  ISBN 978-0-7918-8690-8.
  
  DOI: 10.1115/OMAE2023-102788
- Giljarhus, Knut Erik Teigen; Porcarelli, Alessandro; Apeland, Jørgen
  
  (2022)
  Investigation of Rotor Efficiency with Varying Rotor Pitch Angle for a Coaxial Drone.
  Drones.
  
  ISSN 2504-446X.
  
  Volum 6.
  
  Hefte 4.
  
  DOI: 10.3390/drones6040091
- Skadsem, Hans Joakim; Giljarhus, Knut Erik Teigen; Fredheim, Fiona Øijordsbakken; van Riet, Egbert; Keultjes, Wout J. G.
  
  (2022)
  Vibration-assisted annular fluid displacement for rig-less well abandonment operations.
  Journal of Petroleum Science and Engineering.
  
  ISSN 0920-4105.
  
  Volum 215.
  
  DOI: 10.1016/j.petrol.2022.110717
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen
  
  (2022)
  Pedestrian Wind Comfort Assessment Using Computational Fluid Dynamics Simulations With Varying Number of Wind Directions.
  Frontiers in Built Environment.
  
  ISSN 2297-3362.
  
  Volum 8.
  
  DOI: 10.3389/fbuil.2022.858067
- Giljarhus, Knut Erik Teigen; Reid, Robert Cortas; Liland, Fredrik Fang; Oggiano, Luca; Elfmark, Ola
  
  (2022)
  Aerodynamic influence of an alpine skier’s arms.
  Sports Engineering.
  
  ISSN 1369-7072.
  
  Volum 25.
  
  DOI: 10.1007/s12283-022-00385-2
- Giljarhus, Knut Erik Teigen; Gooding, Mika Tobias; Njærheim, Joar
  
  (2022)
  Disc golf trajectory modelling combining computational fluid dynamics and rigid body dynamics.
  Sports Engineering.
  
  ISSN 1369-7072.
  
  Volum 25.
  
  Hefte 1.
  
  s.1-9.
  
  DOI: 10.1007/s12283-022-00390-5
- Elfmark, Ola; Giljarhus, Knut Erik Teigen; Liland, Fredrik Fang; Oggiano, Luca; Reid, Robert
  
  (2021)
  Aerodynamic Investigation of Tucked Positions in Alpine Skiing.
  Journal of Biomechanics.
  
  ISSN 0021-9290.
  
  Volum 119.
  
  DOI: 10.1016/j.jbiomech.2021.110327
- Giljarhus, Knut Erik Teigen; Mikkelsen, Ove Kjetil
  
  (2021)
  Bruk av nettbrett til digitale innleveringer i fag med matematisk notasjon.
  Nordic Journal of STEM Education.
  
  ISSN 2535-4574.
  
  DOI: 10.5324/njsteme.v5i1.3902
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Hjertager, Bjørn H
  
  (2021)
  Influence of geometry acquisition method on pedestrian wind simulations.
  Journal of Wind Engineering and Industrial Aerodynamics.
  
  ISSN 0167-6105.
  
  Volum 215.
  
  DOI: 10.1016/j.jweia.2021.104665
- Ghorbani, Maryam; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim; Time, Rune Wiggo
  
  (2021)
  Computational fluid dynamics simulation of buoyant mixing of miscible fluids in a tilted tube.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 1201 .
  
  Hefte 012021.
  
  DOI: 10.1088/1757-899X/1201/1/012021
- Giljarhus, Knut Erik Teigen; Owolabi, Jibola Obafemi; Frøynes, Olav Are
  
  (2021)
  Comparison of unidirectional and bidirectional airfoils in a tidal stream turbine.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 1201.
  
  DOI: 10.1088/1757-899x/1201/1/012004
- Giljarhus, Knut Erik Teigen; Panahi, Ghazalsadat Shariat; Frøynes, Olav Are
  
  (2021)
  Computational investigation of the aerodynamic performance of reversible airfoils for a bidirectional tidal turbine.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 1201.
  
  DOI: 10.1088/1757-899x/1201/1/012003
- Jurga, Agata Patrycja; Janocha, Marek Jan; Yin, Guang; Giljarhus, Knut Erik Teigen; Ong, Muk Chen
  
  (2021)
  Validation and assessment of different RANS turbulence models for simulating turbulent flow through an orifice plate.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  DOI: 10.1088/1757-899x/1201/1/012019
- Giljarhus, Knut Erik Teigen; Stave, Daniel Årrestad; Oggiano, Luca
  
  (2020)
  Investigation of Influence of Adjustments in Cyclist Arm Position on Aerodynamic Drag Using Computational Fluid Dynamics.
  Proceedings.
  
  ISSN 2504-3900.
  
  Volum 49.
  
  Hefte 1.
  
  DOI: 10.3390/proceedings2020049159
- Giljarhus, Knut Erik Teigen
  
  (2020)
  pyBEMT: An implementation of the Blade Element Momentum Theory in Python.
  Journal of Open Source Software (JOSS).
  
  ISSN 2475-9066.
  
  Volum 5.
  
  Hefte 53.
  
  DOI: 10.21105/joss.02480
- Bahuguni, Anand; Kumara, Amaranath S.; Giljarhus, Knut Erik Teigen
  
  (2019)
  Modelling of hydrocarbon gas and liquid leaks from pressurized process systems.
  International Journal of Computational Methods & Experimental Measurements.
  
  ISSN 2046-0546.
  
  Volum 7.
  
  Hefte 2.
  
  s.154-166.
  
  DOI: 10.2495/CMEM-V7-N2-154-166
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Qu, Sen; Hjertager, Bjørn H
  
  (2019)
  The performance of structured and unstructured grids on wind simulations around a high-rise building.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 700.
  
  Hefte 1.
  
  DOI: 10.1088/1757-899X/700/1/012001
- Nakhostin, Seyedeh Mona; Giljarhus, Knut Erik Teigen
  
  (2019)
  Investigation of transitional turbulence models for CFD simulation of the drag crisis for flow over a sphere.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 700.
  
  Hefte 1.
  
  DOI: 10.1088/1757-899X/700/1/012007
- Giljarhus, Knut Erik Teigen; Evje, Steinar
  
  (2019)
  
  Use of the Finite Volume Framework OpenFOAM for Simulation of Tumor Growth. I: 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.
  
  s.139-147.
- Riva, Lorenzo; Teigen, Knut Erik; Hjertager, Bjørn H; Kalvig, Siri Margrethe
  
  (2017)
  Implementation and application of the actuator line model by OpenFOAM for vertical axis wind turbine.
  IOP Conference Series: Materials Science and Engineering.
  
  ISSN 1757-8981.
  
  Volum 276.
  
  Hefte 1.
  
  DOI: 10.1088/1757-899X/276/1/012002
- Radhakrishnan, Kumaresh Govindan; Fossan, Ingar; Venkatraman, Marutha Muthu; Giljarhus, Knut Erik Teigen; Spangelo, Øystein; Jensen, Stian
  
  (2016)
  CFD-based transient ignition probability modeling of gas leaks in enclosures.
  International Journal of Computational Methods.
  
  ISSN 0219-8762.
  
  DOI: 10.1142/s0219876216400065
- Aursand, Peder; Evje, Steinar; Flåtten, Tore; Teigen, Knut Erik; Munkejord, Svend Tollak
  
  (2014)
  An exponential time-differencing method for monotonic relaxation systems.
  Applied Numerical Mathematics.
  
  ISSN 0168-9274.
  
  Volum 80.
  
  s.1-21.
  
  DOI: 10.1016/j.apnum.2014.01.003
- Teigen, Knut Erik; Munkejord, Svend Tollak; Skaugen, Geir
  
  (2012)
  Solution of the Span–Wagner Equation of State Using a Density–Energy State Function for Fluid-Dynamic Simulation of Carbon Dioxide.
  Industrial & Engineering Chemistry Research.
  
  ISSN 0888-5885.
  
  Volum 51.
  
  Hefte 2.
  
  s.1006-1014.
  
  DOI: 10.1021/ie201748a
- Teigen, Knut Erik; Song, P; Lowengrub, J; Voigt, A
  
  (2011)
  A diffuse-interface method for two-phase flows with soluble surfactants.
  Journal of Computational Physics.
  
  ISSN 0021-9991.
  
  Volum 230.
  
  Hefte 2.
  
  s.375-393.
  
  DOI: 10.1016/j.jcp.2010.09.020
- Teigen, Knut Erik; Munkejord, Svend Tollak
  
  (2011)
  Numerical investigation of electrostatically enhanced coalescence of two drops in a flow field.
  Proceedings of IEEE International Conference on Dielectric Liquids.
  
  ISSN 2153-3725.
  
  DOI: 10.1109/ICDL.2011.6015441
- Teigen, Knut Erik; Lervåg, Karl Yngve; Munkejord, Svend Tollak
  
  (2010)
  
  Sharp interface simulations of surfactant-covered drops in electric fields. I: V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010.
  
  European Community on Computional Methods in Applied Sciences (ECCOMAS).
  
  ISBN 978-989-96778-1-4.
- Teigen, Knut Erik; Munkejord, Svend Tollak
  
  (2010)
  Influence of surfactant on drop deformation in an electric field.
  Physics of Fluids.
  
  ISSN 1070-6631.
  
  Volum 22.
  
  Hefte 11.
  
  DOI: 10.1063/1.3504271
- Teigen, Knut Erik; Li, X. Rong; Lowengrub, J; Wang, F; Voigt, A
  
  (2009)
  
  A DIFFUSE-INTERFACE APPROACH FOR MODELING TRANSPORT, DIFFUSION AND ADSORPTION/DESORPTION OF MATERIAL QUANTITIES ON A DEFORMABLE INTERFACE.
  
  Communications in Mathematical Sciences.
  
  ISSN 1539-6746.
  
  Volum 7.
  
  Hefte 4.
  
  s.1009-1037.
- Teigen, Knut Erik; Munkejord, Svend Tollak
  
  (2009)
  Sharp-interface Simulations of Drop Deformation in Electric Fields.
  IEEE transactions on dielectrics and electrical insulation.
  
  ISSN 1070-9878.
  
  Volum 16.
  
  Hefte 2.
  
  s.475-482.
  
  DOI: 10.1109/TDEI.2009.4815181
Bøker og kapitler
- Teigen, Knut Erik; Gran, Inge Røinaas; Munkejord, Svend Tollak
  
  (2010)
  
  Development and use of intrface-capturing methods for investigation of surfactant-covered drops in electric fields.
  
  Norges teknisk-naturvitenskapelige universitet.
  
  ISBN 978-82-471-2297-6.
  
  Hefte 2010: 163.
Formidling
- Syse, Helleik Rosenvinge; Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Müller, Anders Riel
  
  (2024)
  
  Er små vindmøller en god investering?.
  
  Stavanger Aftenblad.
  
  ISSN 0804-8991.
- Giljarhus, Knut Erik Teigen; Hågbo, Trond-Ola; Shaukat, Usman
  
  (2023)
  
  Wind simulations in urban environments: comfort, pollution and energy efficiency.
  
  Future Energy Hub Seminar and Workshop;
  
  2023-02-01.
- Hågbo, Trond-Ola; Venkatraman, Kartik; Buckingham, Sophia; Giljarhus, Knut Erik Teigen
  
  (2023)
  
  Parametric sensitivity analysis of precursor generated inflow profiles including atmospheric stability for RANS-based ABL microscale wind simulations .
  
  14th Symposium of VKI PhD Research 2023;
  
  2023-03-07 - 2023-03-10.
- Ghorbani, Maryam; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim
  
  (2023)
  
  Impact of fluid viscosity on density-unstable displacements in inclined and eccentric annuli.
  
  Olympiad in Engineering Science 2023;
  
  2023-05-23 - 2023-05-27.
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen
  
  (2022)
  
  Influence of number of simulated wind directions on pedestrian wind comfort maps.
  
  13th Symposium of VKI PhD Research 2022;
  
  2022-02-23 - 2022-02-25.
- Venkatraman, Kartik; Hågbo, Trond-Ola; Buckingham, Sophia; Giljarhus, Knut Erik Teigen
  
  (2021)
  
  Influence of thermal stability and forest canopy in non-neutral atmospheric boundary modelling over complex terrain.
  
  The 3rd edition of the Wind Energy Science Conference (WESC): Mini-Symposium: The Pragmatic Choice of Wind Models for Wind Resource Assessment;
  
  2021-05-25 - 2021-05-28.
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Hjertager, Bjørn H
  
  (2021)
  
  Influence of geometry acquisition method on pedestrian wind simulations.
  
  Smart City Seminar;
  
  2021-06-10.
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Hjertager, Bjørn H
  
  (2021)
  
  Influence of geometry acquisition method on pedestrian wind simulations.
  
  Poster session at Nordic Edge Expo 2021;
  
  2021-09-20 - 2021-09-22.
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen
  
  (2021)
  
  Influence of number of simulated wind directions on pedestrian wind comfort maps.
  
  COTech (Computational Methods & Ocean Technology) (3rd);
  
  2021-11-25 - 2021-11-26.
- Giljarhus, Knut Erik Teigen; Oggiano, Luca; Stave, D.Å.
  
  (2020)
  
  Investigation of Influence of Adjustments in Cyclist Arm Position on Aerodynamic Drag Using Computational Fluid Dynamics.
  
  ISEA2020 The 13th Conference of the International Sports Engineering Association;
  
  2020-06-22 - 2020-06-27.
- Giljarhus, Knut Erik Teigen; Elfmark, Ola; Reid, Robert; Liland, Fredrik Fang; Oggiano, Luca
  
  (2020)
  
  Improving downhill skier aerodynamics through detailed flow simulation .
  
  Nordic Winter Sports Conference;
  
  2020-10-01 - 2020-10-02.
- Giljarhus, Knut Erik Teigen
  
  (2020)
  
  Potential of physical simulation, sensors and 3D maps in smart cities.
  
  Innoasis Science Talks;
  
  2020-10-20.
- Oggiano, Luca; Giljarhus, Knut Erik Teigen; Elfmark, Ola; Liland, Fredrik Fang
  
  (2020)
  
  From the mountains to the ocean - from a fluid dynamics perspective.
  
  Workshop Sports Aero- and Hydrodynamics;
  
  2020-11-27.
- Giljarhus, Knut Erik Teigen; Hågbo, Trond-Ola; Røstvik, Harald Nils; Skiaker, Eirin
  
  (2019)
  
  Energilab på UiS.
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Hjertager, Bjørn H
  
  (2019)
  
  Influence of Geometry Input on Urban CFD Wind Simulations – Comparison of 3D Models from LiDAR, Photogrammetry and Digital Building Data.
  
  The 15th International Conference on Wind Engineering;
  
  2019-09-02 - 2019-09-06.
- Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Qu, Sen; Hjertager, Bjørn H
  
  (2019)
  
  The performance of structured and unstructured grids on wind simulations around a high-rise building.
  
  Computational Methods in Offshore Technology (COTech) 2019;
  
  2019-11-27 - 2019-11-29.
- Giljarhus, Knut Erik Teigen; Evje, Steinar
  
  (2019)
  
  Use of the Finite Volume Framework OpenFOAM for Simulation of Tumor Growth.
  
  MekIT’19 - 10th National Conference on Computational Mechanics;
  
  2019-06-03 - 2019-06-04.
- Giljarhus, Knut Erik Teigen; Nakhostin, Seyedeh Mona; Oggiano, Luca; Grønnestad, Kjetil
  
  (2019)
  
  Digital tvilling kan gi Kajsa større fart.
- Giljarhus, Knut Erik Teigen; Nakhostin, Seyedeh Mona; Oggiano, Luca; Grønnestad, Kjetil
  
  (2019)
  
  Digital tvilling kan gi Kajsa større fart - bruker avansert teknologi i toppidrett.
- Petersen, Johnny; Khatibi, Milad; Giljarhus, Knut Erik Teigen; Time, Rune Wiggo
  
  (2019)
  
  Study of the interaction between spherical particles of different sizes in horizontal fluid flow in a pipe - Experiment, static and dynamic modelling.
  
  17th Multiphase Flow Conference and Short Course: Simulation, Experiment and Application;
  
  2019-11-11 - 2019-11-15.
- Teigen, Knut Erik
  
  (2018)
  
  Første sameie i Norge med strøm fra batterier .
- Riva, Lorenzo; Teigen, Knut Erik; Hjertager, Bjørn H; Kalvig, Siri Margrethe
  
  (2017)
  
  Implementation and application of the actuator line model by OpenFOAM for a vertical axis wind turbine.
  
  CoTECH;
  
  2017-11-29 - 2017-12-01.
- Munkejord, Svend Tollak; Giljarhus, Knut Erik Teigen; Lervåg, Karl Yngve
  
  (2012)
  
  Calculation of droplet dynamics in an electric field using the level-set method.
  
  International Conference on Numerical Methods in Multiphase Flows;
  
  2012-06-12 - 2012-06-14.
- Teigen, Knut Erik; Munkejord, Svend Tollak; Hansen, Erik Bjørklund
  
  (2008)
  
  A computational study of the coalescence process between a drop and an interface in an electric field.
  
  6th International Conference on CFD in the Oil & Gas, Metallurgical and Process Industries;
  
  2008-06-10 - 2008-06-12.
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