Blar i UiS Brage på forfatter "Obhrai, Charlotte"
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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 ... -
The Impact of Non-Surface Layer Wind Profiles on the Loads and Motions of Offshore Wind Turbines
Song, Rong (Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019)This master thesis analyzes the influence of wind speed and variation in mean wind profiles on the loads and motions of offshore wind turbine. Primarily, fully-scale measurement data from the research platform FINO3 in ... -
The Influence of an Unstable Turbulent Wind Spectrum on the Loads and Motions on a Floating Offshore Wind Turbine
Knight, Julie-Ann (Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06)Floating offshore wind turbines are exposed to harsh environmental conditions throughout their lifetime and typically experience unstable atmospheric conditions. Including the effect of atmospheric stability should improve ... -
The scalability of floating wind installations in Norway and beyond
Hohl, Laura Katharina (Master thesis, 2022)Offshore wind energy has recently become a big industry in many countries [89]. However, offshore floating is still at the beginning of its commercial use, and the number of projects under development has increased. Future ... -
Thermal Stratification and Turbulent Wind Loading on Floating Wind Turbines
Putri, Rieska Mawarni (PhD thesis UiS;, Doctoral thesis, 2023)Offshore wind is a promising clean energy alternative to fossil fuels. The wind resource at sea is considerably stronger than on land, and the offshore wind turbines (OWTs) tend to be larger. Currently, more than 160 ... -
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 ... -
Validation of the High Order Spectral (HOS) Method for Extreme and Breaking Waves and Coupling of the HOS-Numerical Wave Tank Model with OpenFOAM
Quinn, Brendan (Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06)The objective of this study was to investigate the abilities of the open-source potential flow solver HOS-NWT with regard to extreme wave events and deep-water wave breaking. In addition to this, significant effort was ... -
Wind Profile Usage in Wind Farm Installation Campaign Simulations
Oyegbile, Afolarinwa (Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06-15)Simulation tools are used in the wind industry to analyse and understand installation campaigns for strategic planning purposes. These tools use vertical wind profiles to estimate wind speeds at various heights. Where these ... -
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. ...