Browsing Publikasjoner fra CRIStin by Author "Obhrai, Charlotte"
Now showing items 1-9 of 9
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CFD simulations of violent breaking wave impacts on a vertical wall using a two-phase compressible solver
Liu, Shengnan; Gatin, Inno; Obhrai, Charlotte; Ong, Muk Chen; Jasak, Hrvoje (Peer reviewed; Journal article, 2019)Four different types of breaking wave impacts on a vertical wall are simulated using a two-dimensional two-phase Computational Fluid Dynamic (CFD) model. Air is considered as an isentropic ideal gas without solving an ... -
The COTUR project: remote sensing of offshore turbulence for wind energy application
Cheynet, Etienne; Flügge, Martin; Reuder, Joachim; Jakobsen, Jasna Bogunovic; Heggelund, Yngve; Svardal, Benny; Saavedra Garfias, Pablo Andres; Obhrai, Charlotte; Daniotti, Nicolo; Berge, Jarle; Duscha, Christiane Anabell; Wildmann, Norman; Onarheim, Ingrid Husøy; Godvik, Marte (Peer reviewed; Journal article, 2021-09)The paper presents the measurement strategy and data set collected during the COTUR (COherence of TURbulence with lidars) campaign. This field experiment took place from February 2019 to April 2020 on the southwestern coast ... -
Methods for analysing wave slamming loads on truss structures used in offshore wind applications based on experimental data
Jose, Jithin; Podrazka, Olga; Obhrai, Charlotte; Gudmestad, Ove Tobias; Cieslikiewicz, Witold (Peer reviewed; Journal article, 2016)Offshore wind turbines installed in shallow water regions are subjected to highly varying hydrodynamic loads, also from plunging breaking waves. Many investigations have been made regarding the wave slamming forces acting ... -
Numerical Analysis of the Effect of Offshore Turbulent Wind Inflow on the Response of a Spar Wind Turbine
Putri, Rieska Mawarni; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic; Ong, Muk Chen (Peer reviewed; Journal article, 2020)Turbulent wind at offshore sites is known as the main cause for fatigue on offshore wind turbine components. Numerical simulations are commonly used to predict the loads and motions of floating offshore wind turbines; ... -
Offshore Wind Turbine Loads and Motions in Unstable Atmospheric Conditions
Putri, Rieska Mawarni; Obhrai, Charlotte; Knight, Julie-Ann Marie (Peer reviewed; Journal article, 2019)Even though it is widely known that unstable atmospheric stability conditions can lead to higher turbulence, the use of proper turbulent wind models considering unstable conditions are not often used in the simulation of ... -
Response sensitivity of a semisubmersible floating offshore wind turbine to different wind spectral models
Putri, Rieska Mawarni; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic (Peer reviewed; Journal article, 2020)Previous research on the OC3 spar floating offshore wind turbine (FOWT) has shown the sensitivity of the yaw and side-side modes' load and motion responses to different atmospheric conditions. Using the same baseline turbine ... -
Spectral characteristics of surface-layer turbulence in the North Sea
Cheynet, Etienne; Jakobsen, Jasna Bogunovic; Obhrai, Charlotte (Journal article, 2017-10)According to IEC 61400-1 and IEC 61400-3 standards, the wind load on the rotor-nacelle assembly of offshore wind turbines should be estimated from the Kaimal or Mann spectral models, unless site-specific full-scale ... -
Turbulence in a coastal environment: the case of Vindeby
Putri, Rieska Mawarni; Cheynet, Etienne; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2022-08-11)The one-point and two-point power spectral densities of the wind velocity fluctuations are studied using the observations from an offshore mast at Vindeby Offshore Wind Farm, for a wide range of thermal stratifications of ... -
Wind-induced response of an offshore wind turbine under non-neutral conditions: A comparison with Hywind Scotland
Putri, Rieska Mawarni; Obhrai, Charlotte (Peer reviewed; Journal article, 2022)In this study, aeroelastic simulations of a 5 MW spar wind turbine are performed by using simulated wind fields that are representative of surface layer marine atmospheric turbulence under different atmospheric stratifications. ...