Browsing NTNU Open by Author "Navaratnam, Christy Ushanth"

Now showing items 1-10 of 10

    • An experimental investigation on the flow resistance over a porous gravel-bed surface and its non-porous counterpart 

      Navaratnam, Christy Ushanth; Aberle, Jochen; Qin, Jie; Henry, Pierre-Yves T (Journal article; Peer reviewed, 2018)
      This paper presents preliminary results from laboratory experiments which were specifically designed to determine the flow resistance over a water-worked gravel-bed and its impermeable counterpart (cast-bed). The technique ...

    • Experimental and Numerical Determination of the Head Loss of a Pressure Driven Flow through an Unlined Rock-Blasted Tunnel 

      Aberle, Jochen; Henry, Pierre-Yves T; Kleischmann, Fabian; Navaratnam, Christy Ushanth; Vold, Mari; Eikenberg, Ralph; Olsen, Nils Reidar Bøe (Peer reviewed; Journal article, 2020)
      The friction loss in a part of the rock-blasted unlined tunnel of the Litjfossen hydropowerplant in Norway was determined from experimental and numerical studies. Remote sensing datafrom the prototype tunnel provided the ...

    • Experimental hydraulics on fish-friendly trash-racks: an ecological approach 

      Szabo-Meszaros, Marcell; Navaratnam, Christy Ushanth; Aberle, Jochen; Silva, Ana T.; Forseth, Torbjørn; Calles, Olle; Fjeldstad, Hans-Petter; Alfredsen, Knut (Journal article; Peer reviewed, 2018)
      The obstruction of fish migratory routes by hydroelectric facilities is worldwide one of the major threats to freshwater fishes. During downstream migration, fish may be injured or killed on the trash-racks or in the ...

    • Head losses and flow field at trash racks 

      Øvregård, Eirik Bruvik (Master thesis, 2016)
      The purpose of this master thesis was to measure the head loss caused by fish-friendly trash racks in an open water channel and to measure the turbulent flow field around its bars. Angled model trash racks with different ...

    • Head losses and flow field at trash racks 

      Øvregård, Eirik Bruvik (Master thesis, 2016)
      The purpose of this master thesis was to measure the head loss caused by fish-friendly trash racks in an open water channel and to measure the turbulent flow field around its bars. Angled model trash racks with different ...

    • Hydraulic physical model production with Computer Numerically Controlled (CNC) manufacturing techniques 

      Henry, Pierre-Yves T; Aberle, Jochen; Navaratnam, Christy Ushanth; Ruther, Nils (Journal article; Peer reviewed, 2018)
      Physical models are a well-accepted tool in hydraulic engineering, allowing for the detailed characterisation of flow processes and the validation of structure designs with complex boundary conditions. The methods used to ...

    • Influence of Gravel-Bed Porosity and Grain Orientation on Bulk Flow Resistance 

      Navaratnam, Christy Ushanth; Aberle, Jochen; Qin, Jie; Henry, Pierre-Yves T (Journal article; Peer reviewed, 2018)
      This paper presents results from experiments that were carried out to study the effect of porosity and grain orientation on flow resistance. Experiments were performed over three rough surfaces; a water-worked gravel-bed, ...

    • Numerical analysis of dynamic response of jacket structures subject to slamming forces by breaking waves 

      Woo, Chanjo; Chun, Insik; Navaratnam, Christy Ushanth; Shim, Jaeseol (Journal article; Peer reviewed, 2017)
      The present study numerically analyzed the dynamic behavior of 3D framed structures subject to impulsive slamming forces by violent breaking waves. The structures were modeled using multiple lumped masses for the vertical ...

    • The effect of bed porosity on turbulent flow in gravel-bed rivers 

      Navaratnam, Christy Ushanth (Doctoral theses at NTNU;2018:352, Doctoral thesis, 2018)
      This thesis presents the main findings from laboratory experiments that were specially designed to study the effect of gravel bed porosity on the surface flow characteristics. The thesis also contains five primary and two ...

    • Wave slamming forces on truss structures for wind turbines 

      Navaratnam, Christy Ushanth (Master thesis, 2013)
      Generally the foundations of offshore wind turbines are steel truss structures which are exposed to wave slamming forces due to breaking waves, typically plunging breaking waves in shallow water. Calculations show that the ...