Now showing items 3345-3364 of 3397

    • Wake behind a concave curved cylinder 

      Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf; Kim, Jongmin; Kim, Sungtae (Journal article; Peer reviewed, 2018)
      The wake behind a quarter-of-ring concave curved cylinder is investigated in this paper by means of direct numerical simulations. The plane of curvature is aligned with the uniform incoming flow. We have appended straight ...
    • Wake Effect Mitigation of Floating Offshore Wind Farms Combining Layout Optimization, Turbine Repositioning and Yaw-based Wake Redirection 

      Ceriello, Vincenzo (Master thesis, 2023)
      Floating wind turbines despite the potential to harness energy from deep offshore areas where higher average wind speeds face challenges in terms of competitiveness. One approach to raising the competitiveness of a wind ...
    • Wake flow behind a curved cylinder 

      Knudsen, Tor Huse (Master thesis, 2014)
      This thesis reports the result of an experiment measuring the wake flow behind a curved circular cylinder at Re=3900 in water. The measurement technique used was Particle Image Velocimetry (PIV). The cylinder is a convex ...
    • Wake Shielding Model Effect on Riser Dynamic Response 

      Fu, Ping; Leira, Bernt Johan; Myrhaug, Dag (Chapter, 2017)
      The paper provides a method to estimate the clearance between two flexible risers in tandem arrangement by taking into account the wake interference when subjected to a combined current plus waves flow. The wake interference ...
    • Wake structures and vortex-induced forces of a controlled in-line vibrating circular cylinder 

      Huang, Zhiyong; Ong, Muk Chen; Larsen, Carl Martin (Peer reviewed; Journal article, 2019)
      A two-dimensional numerical study was performed to investigate wake structures and fluid forces on a circular cylinder with prescribed vibrations in the in-line direction. Reynolds number was fixed at 500, and the SST k-w ...
    • Wall Modeled Large Eddy Simulation of Viscous Flow on the BeVERLI Hill Geometry 

      Engan, Lars (Master thesis, 2021)
      I denne masteroppgaven har vegg-modellert LES blitt brukt til å simulere den viskøse strømningen over BeVERLI hill geometrien. BeVERLI hill er en veggmontert «bump» som blir brukt i valideringsstudier av turbulente separerte ...
    • Water Entry of Freefall Wedges-Wedge Motions and Cavity Dynamics 

      Wang, Jingbo (Doktoravhandlinger ved NTNU, 1503-8181; 2014:144, Doctoral thesis, 2014)
      When a free falling object enters a free surface of water, it may go through four successive phases: impact, flow separation from the body surface, creation and pinch-off of the cavity above the body, and oscillation of ...
    • Wave and Current Effects on Floating Fish Farms 

      Faltinsen, Odd Magnus; Shen, Yugao (Journal article; Peer reviewed, 2018)
      The paper is partly a review on hydrodynamic and structural aspects of fish farms. In addition, new numerical results are presented on the stochastic behavior of bending stresses in the floater of a realistic net cage in ...
    • Wave conditions encountered by ships—A report from a larger shipping company based on ERA5 

      Nielsen, Ulrik D.; Ikonomakis, Angelos (Peer reviewed; Journal article, 2021)
      This study reports about the wave conditions encountered by the fleet of Maersk Line. Herein, wave conditions refer to integral wave parameters in terms of significant wave height, zero-upcrossing period, and wave direction ...
    • Wave Conditions for Offshore Wind Turbine Foundations in Intermediate Water Depths 

      Engebretsen, Espen André (Master thesis, 2012)
      In this thesis, the effects on regular waves when propagating from deep to shallow water have been investigated, assuming linear wave theory. The effects of shoaling, refraction, reflection and diffraction have been studied. ...
    • Wave dispersion in moderate channel turbulence 

      Pilloton, Chiara; Lugni, Claudio; Graziani, Giorgio; Fedele, Francesco (Peer reviewed; Journal article, 2023)
      We study channel turbulence by interpreting its vorticity as a random sea of ocean wave packet analogues. In particular, we investigate the ocean-like properties of vortical packets applying stochastic methods developed ...
    • Wave disturbance rejection for monopile offshore wind turbines 

      Smilden, Emil; Bachynski, Erin Elizabeth; Sørensen, Asgeir Johan; Amdahl, Jørgen (Journal article; Peer reviewed, 2019)
      The dimensions of offshore wind turbine (OWT) support structures are governed by fatigue considerations. For 6‐ to 10‐MW OWTs, wave loads are often dominating in terms of fatigue utilization. The present work proposes a ...
    • Wave Energy Driven Desalination of Seawater – Experimental investigation of the hydrodynamic performance 

      Palmstrøm, Andreas; Brandsvoll, Rolf Anders (Master thesis, 2011)
    • Wave induced effects on floaters of aquaculture plants 

      Kristiansen, David (Doctoral Theses at NTNU, 1503-8181; 2010:20, Doctoral thesis, 2010)
      The main objective of this work is to study wave loads on floaters of fish farms. Several incidents of major fish escapes due to structural collapse of fish farms in harsh weather have motivated this study, as a step towards ...
    • Wave induced effects on floaters of aquaculture plants 

      Kristiansen, David (Doctoral Theses at NTNU, 1503-8181; 2010:20, Doctoral thesis, 2010)
      The main objective of this work is to study wave loads on floaters of fish farms. Several incidents of major fish escapes due to structural collapse of fish farms in harsh weather have motivated this study, as a step towards ...
    • Wave induced motions of two ships advancing on parallel course 

      Ronæss, Marit (Doktoravhandlinger ved NTNU, 1503-8181; 64, Doctoral thesis, 2002)
      Under way replenishment between two ships is a critical operation, and accidents have been reported. Hydrodynamic interaction between the hulls may influence the forces and the motions of the vessels, and both manoeuvring ...
    • Wave inhomogeneities in a wave basin of constant water depth 

      Lafleche, Sebastien Jacques Marie; Ommani, Babak; Kristiansen, Trygve; Fouques, Sebastien (Journal article; Peer reviewed, 2023)
      Experimental testing of large marine structures in hydrodynamic laboratories requires an accurate reproduction of waves over a large area of the basin. However, with a uniform motion of the wavemaker, wave interactions ...
    • Wave load compensation in DP control systems 

      Brørby, Bjørn Theodor Torp (Master thesis, 2022)
      Denne masteroppgaven presenterer alternative metoder for bølgelastkompensasjon i dynamiske posisjonering (DP) av marine fartøy, der stabile og robuste konvensjonelle kontrollere med tilbakekopling vanligvis brukes. Slike ...
    • Wave load effect analysis of a floating bridge in a fjord considering inhomogeneous wave conditions 

      Cheng, Zhengshun; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2018)
      When designing a floating bridge crossing a deep and wide fjord, a homogeneous wave field is usually assumed for simplicity. However, waves in fjords are commonly inhomogeneous, and hence the mentioned design practice ...
    • Wave loads on decks of offshore structures in random seas 

      Kota, Ravikiran S (Doktoravhandlinger ved NTNU, 1503-8181; 2012:163, Doctoral thesis, 2012)