Blar i UiS Brage på forfatter "Hjertager, Bjørn H"
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Comparing different CFD wind turbine modelling approaches with wind tunnel measurements
Kalvig, Siri M.; Manger, Eirik; Hjertager, Bjørn H (Peer reviewed; Journal article, 2014)The performance of a model wind turbine is simulated with three different CFD methods: actuator disk, actuator line and a fully resolved rotor. The simulations are compared with each other and with measurements from a wind ... -
The effects of slab geometries and wave directions on the steep wave-induced soil response and liquefaction around gravity-based offshore foundations
Li, Yuzhu; Ong, Muk Chen; Gudmestad, Ove Tobias; Hjertager, Bjørn H (Peer reviewed; Journal article, 2019)Gravity-based offshore foundations generally consist of a bottom slab and one or more cylindrical shafts on top of it. The slab geometry can strongly affect the surrounding flow pattern, dynamic wave pressure distribution ... -
Multi-fluid CFD analysis in Process Engineering
Hjertager, Bjørn H (Journal article; Peer reviewed, 2017)An overview of modelling and simulation of flow processes in gas/particle and gas/liquid systems are presented. Particular emphasis is given to computational fluid dynamics (CFD) models that use the multi-dimensional ... -
The performance of structured and unstructured grids on wind simulations around a high-rise building
Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Qu, Sen; Hjertager, Bjørn H (Journal article; Peer reviewed, 2019)In this study, computational fluid dynamics has been applied to analyze the performance of both structured and unstructured meshes when used in steady-state simulations of wind in an urban area. This case specifically ... -
Wave Influenced Wind and the Effect on Offshore Wind Turbine Performance
Kalvig, Siri M.; Manger, Eirik; Hjertager, Bjørn H; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2014)In this paper the effect of wave influenced wind on offshore wind turbines is studied numerically. The wave is seen as a dynamical roughness that influences the wind flow and hence the wind turbine performance. An actuator ...