• Assessment of wind conditions at a fjord inlet by complementary use of sonic anemometers and lidars 

      Jakobsen, Jasna Bogunovic; Cheynet, Etienne; Snæbjörnsson, Jonas Thor; Mikkelsen, Torben; Sjøholm, Mikael; Angelou, Nicolas; Hansen, Per; Mann, Jakob; Svardal, Benny; Kumer, Valerie-Marie; Reuder, Joachim (Journal article; Peer reviewed, 2015)
      Wind velocity measurement devices based on the remote optical sensing, lidars, are extensively applied in wind energy research and wind farm operation. The present paper demonstrates the relevance and potential of lidar ...
    • Bridge buffeting by skew winds: A revised theory 

      Morais da Costa, Bernardo; Wang, Jungao; Jakobsen, Jasna Bogunovic; Øiseth, Ole Andre; Snæbjørnsson, Jonas Thor (Peer reviewed; Journal article, 2021-01)
      An improved bridge buffeting theory is established with an emphasis on skew wind directions, for both turbulence- and motion-dependent forces. It provides simplifications and generalizations of previously established ...
    • CFD simulations of a suspension bridge deck for different deck shapes with railings and vortex mitigating devices 

      Kusano, Ibuki; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor (Peer reviewed; Journal article, 2019)
      Aerodynamic response of a single-box suspension bridge girder is investigated using CFD simulations. The importance of including railings and vortex mitigating devices such as guide vanes and a spoiler in the simulations ...
    • 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 ...
    • Data-driven prediction of mean wind turbulence from topographic data 

      Morais da Costa, Bernardo; Snæbjørnsson, Jonas Thor; Øiseth, Ole Andre; Wang, Jungao; Jakobsen, Jasna Bogunovic (Peer reviewed; Journal article, 2021)
      This study presents a data-driven model to predict mean turbulence intensities at desired generic locations, for all wind directions. The model, a multilayer perceptron, requires only information about the local topography ...
    • Full-scale observation of the flow downstream of a suspension bridge deck 

      Cheynet, Etienne; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor; Angelou, Nikolas; Mikkelsen, Torben; Sjöholm, Mikael; Svardal, Benny (Peer reviewed; Journal article, 2017-12)
      The paper presents a full-scale observation of the flow conditions downstream of a suspension bridge by a system of synchronized short-range dual-Doppler wind lidars. The lidar units were deployed directly on the bridge ...
    • Improved long‐span bridge modeling using data‐driven identification of vehicle‐induced vibrations 

      Cheynet, Etienne; Daniotti, Nicolo; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor (Peer reviewed; Journal article, 2020-06)
      The paper introduces a procedure to automatically identify key vehicle characteristics from vibrations data collected on a suspension bridge. The primary goal is to apply a model of the dynamic displacement response of a ...
    • The influence of terrain on the mean wind flow characteristics in a fjord 

      Cheynet, Etienne; Liu, Shengnan; Ong, Muk Chen; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor; gatin, Inno (Peer reviewed; Journal article, 2020)
      Flow conditions in complex terrains such as fjords are highly three-dimensional and thus not properly captured by the wind flow models developed for homogenous terrains. In the present study, we explore the potential of ...
    • Offshore wind turbine wake characteristics using scanning doppler lidar 

      Krishnamurthy, Raghavendra; Reuder, Joachim; Svardal, Benny; Fernando, Harindra Joseph S.; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2017-10)
      Within an offshore wind park, wind flow characteristics are quite complex and govern both the energy production and the structural wind turbine response. An experimental study focussed on assessing the spatial variability ...
    • 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 ...
    • Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section 

      Jeong, Wonmin; Liu, Shengnan; Jakobsen, Jasna Bogunovic; Ong, Muk Chen (Journal article; Peer reviewed, 2019-07)
      The aerodynamic performance of bridge deck girders requires a thorough assessment and optimization in the design of long-span bridges. The present paper describes a numerical investigation of the aerodynamic characteristics ...
    • Vortex-induced vibration (VIV) effects of a drilling riser due to vessel motion 

      Joseph, Rohan Shabu; Wang, Jungao; Ong, Muk Chen; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2017)
      A marine riser undergoes oscillatory motion in water due to the vessel motions, known as global dynamic response. This to-and-fro motion of the riser will generate an equivalent flow that can cause Vortex-Induced Vibrations ...
    • 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 ...
    • Wind coherence measurement by a single pulsed Doppler wind lidar 

      Kumer, Valerie-Marie; Cheynet, Etienne; Jakobsen, Jasna Bogunovic; Svardal, Benny; Reuder, Joachim (Journal article; Peer reviewed, 2016)
      A single pulsed Doppler wind lidar, deployed at the FINO1 platform in the North Sea, has been used to monitor the lateral and vertical coherence of the along-wind component. To maximize the sampling frequency of the ...