Blar i NTNU Open på forfatter "Pettersen, Bjørnar"

Viser treff 21-40 av 63

    • Large-eddy simulations of cross-flow around ship sections 

      Arslan, Tufan (Doctoral thesis at NTNU;2016:111, Doctoral thesis, 2016)
      This thesis reports numerical simulations of three-dimensional (3D) unsteady cross flow over two ship sections located side-by-side. The ship sections have different breadth and draft conditions which represent typical ...

    • LES of Flow Around Tandem Cylinders Close to a Horizontal Wall 

      Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Chapter, 2015)
      This study focuses on the numerical simulations of the flow around tandem cylinders placed in the vicinity of a rigid, horizontal, plane wall. The cylinders are immersed close to a plane wall in a steady current with a ...

    • Low-frequency oscillations in flow past an inclined prolate spheroid 

      Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)
      We analyse the forces on a 45∘ inclined 6:1 prolate spheroid at Reynolds number ReD = 8000. In contrast to flow at lower Reynolds numbers previously investigated, we now find a strong oscillatory behaviour in the global ...

    • Motion analysis of Semi-Submersible 

      Pedersen, Emil Aasland (Master thesis, 2012)
      In this thesis the response variables (RAOs) of a semi submersible unit are inspected. Both operational and survival condition as well as a shallow draft are inspected. The survival condition is inspected with respect to ...

    • Near-Wake of an Inclined 6:1 Spheroid at Reynolds Number 4000 

      Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)
      The flow around a 6:1 prolate spheroid at 45 deg inclination angle and Reynolds number 4000 (based on the minor axis) is described. Despite the fact that the inflow is uniform and steady, the resulting wake is highly ...

    • Numerical Investigation of 3D Flow Around Two Tandem Cylinders 

      Kalvig, Ragnhild Birgitte Hidle (Master thesis, 2015)
      Circular cylinders in tandem arrangement are used in many marine applications like dual pipelines and dual risers. Turbulent flow in 3D around two tandem cylinders is simulated numerically using Large Eddy Simulation (LES) ...

    • Numerical Investigation of 3D Flow around Two Tandem Cylinders 

      Kalvig, Ragnhild Birgitte Hidle; Abrahamsen-Prsic, Mia; Pettersen, Bjørnar (Chapter, 2016)
      Circular cylinders in tandem arrangement are frequently encountered in marine applications, for example as dual pipelines and dual risers. Complex flows arise around tandem cylinders, inducing large fluctuating forces on ...

    • NUMERICAL INVESTIGATION OF FLOW AROUND INTERSECTING CYLINDERS 

      Tian, Cai (Master thesis, 2016)
      Recent years interfering effects in the wake of bluff body are drawing more attention, especially for the intersecting cylinders. The structures with the similar shape of the intersecting cylinder are used in many industrial ...

    • Numerical investigation of flow around intersecting cylinders as part of a net structure 

      Wu, Hao (Master thesis, 2017)
      Interference effects occurs in the wake of cylindrical bodies. In marine fishery and aquaculture industry, circular cylinder is very common in offshore fish farm. The cage, as a knot structure, is consist of intersecting ...

    • Numerical Investigation of Flow Around Rectangular Cylinders at Low Reynolds Numbers 

      Hanstveit, Britta (Master thesis, 2015)
      The study of flow around bluff bodies such as rectangular and circular cylinders is of direct relevance to several practical applications in the marine industry. The flow past bluff bodies involves several fluid phenomena, ...

    • Numerical investigation of flow around straight cylinders with inclination 

      Østgård, Malene Denita; Lunde, Einar (Master thesis, 2016)
      In this master thesis the validity of the independence principle(I.P) on an inclined infinite circular cylinder has been investigated. Normalized Reynolds numbers 150 and 1000 for inclination angles 0°-65° were studied. ...

    • Numerical Investigation of Free Surface Flows 

      Spence, Silas (Master thesis, 2014)
      The Star-CCM+ simulation software has been used to model a number of benchmark free surface flow cases, including the two dimensional submerged NACA 0012 foil, the surface piercing NACA 0024 foil, and the well investigated ...

    • Numerical Investigation of Viscous Flow Around Two Tandem Circular Cylinders Ending on a Flat Plate 

      Rognaldsen, Anette (Master thesis, 2018)
      Flow around cylindrical shapes are frequently seen both within the academics and for applications in ocean and marine engineering. Viscous flow around tandem cylinders fixed to a vertical wall is numerically simulated for ...

    • Numerical Simulation of Flow Around a Prolate Spheroid 

      Nevland, Stian (Master thesis, 2017)
      The concept of closed containment fish cages is promising when coping with sea lice and escaped fish challenges in the aquaculture industry. Unlike the traditional open net cages, the external flow caused by current and ...

    • Numerical simulation of viscous flow around a step cylinder 

      Harr, Mathias (Master thesis, 2018)
      Flow around a step cylinder at was investigated numerically with a diameter ratio of $D/d=2$ and Reynolds number $Re_D=600$. The open source software OpenFoam was used for the numerical simulations. The primary focus in ...

    • Numerical simulation of viscous flow around inclined cicular cylinder 

      Jeong, Young Min (Master thesis, 2017)
      The modern maritime engineering industry uses various types of structures in their fields. The single circular cylinder is the core and basic structure of the industry which is studied with numerical and experimental ...

    • Numerical Simulation of Viscous Flow Past A Curved Cylinder 

      Skjulstad, Christoffer (Master thesis, 2018)
      In the present Master thesis three-dimensional viscous flow simulations of flow past a curved circular cylinder is investigated by utilization of the open source Computational Fluid Dynamics (CFD) code OpenFOAM. The focus ...

    • Numerical Simulation of Viscous Shear Flow Around Tandem Cylinders 

      Attanapola, Dhanushi Nayanatara (Master thesis, 2018)
      The project, Coastal Highway E39, introduces the concept of Submerged Floating Tube Bridge (SFTB). The bridge is simplified as tandem cylinders with longitudinal length-diameter ratio L/D = 3.2, diameter D=1.0 and span-wise ...

    • Numerical simulations of the flow around single and tandem circular cylinders close to a plane wall 

      Prsic, Mia Abrahamsen (Doctoral thesis at NTNU;2016:43, Doctoral thesis, 2016)
      In order to model the turbulent flow around cylindrical structures in various configurations, Large Eddy Simulations (LES) are used in the present work. LES utilize a highly accurate model at reasonable time-consumption, ...

    • Numerical Simulations of Viscous Flow Around Stepped Circular Cylinder 

      Bjørkli, Rune (Master thesis, 2012)
      A stepped cylinder could be a desired design for an offshore buoy or SPAR platform. The geometry of a stepped cylinder consists of a small diameter cylinder (d) placed on top of a large diameter cylinder (D). This master ...