Blar i NTNU Open på forfatter "Holm, Håvard"

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    • Added ship resistance from headboxes and transverse tunnels in full scale CFD 

      Jensen, Jakob Tvedt (Master thesis, 2020)
      Eit fullskala forsyningsskip med to baugtunnelar og headboksar er simulert i stille vatn for å estimera tilleggsmotstanden frå desse modifikasjonane. Holtrop sin formel for baugtunnelar med koeffisientar 0.005 og 0.009 for ...

    • Bestemme GM ved hjelp av rulleperiodetest 

      Hjelvik, Vegard Nesset (Master thesis, 2016)
      Intaktstabilitet er en viktig parameter i designfasen for et fartøy, og har stor innvirkning på hoveddimensjoner og skrogform. For at fartøyer og mannskap skal være trygge, settes det derfor krav til stabiliteten fra ...

    • Calculation of Added Mass in the Proximity of the Seabed for an Oscillating Disc 

      Rosvoll, Magnus Ingvard (Master thesis, 2012)
      Calculations have been made with the commercial CFD-software Ansys Fluent, with dynamic mesh.

    • Detection of encountered waves by using pressure measurements in the bow area of a ship 

      Emmerhoff, Jonas (Master thesis, 2020)
      Frem til nå finnes det ulike metoder å estimere hva bølgetilstanden er på skip. Noen av de eksisterende metodene som finnes er bølgeradarer, bølgebøyer og LIDAR, som er en optisk fjærnmålingsteknikk som bruker et emiterende ...

    • Et CFD studie om hvordan fisk påvirker strømningen inne i lukkede oppdrettsanlegg 

      Olsen, Hannelore (Master thesis, 2019)
      En økende verdenspopulasjon har skapt problemer med å holde mat og levekår til alle på en bærekraftig måte. Det sies at akvakultur vil bli den fortest voksende og viktigste dyrematsektoren til å oppnå dette. Den nåværende ...

    • Experimental investigation of the superposition principle for a free surface roll damping tank 

      Elger, David Emanuel (Master thesis, 2014)
      Roll stabilizing tanks are widely used on offshore supply vessels and fishing vessels to ensure a better and safer working environment. However, the free surface of a partially filled tank is subject to sloshing. On one ...

    • Experimental Investigation of Vertical Forces in Pure Sway Motion for a Free Surface Roll Damping Tank 

      Spilde, Eirik Hereid (Master thesis, 2016)
      In this thesis the objective was to perform experiments in pure sway motion of a model roll damping tank, to try and locate a connection between the vertical forces that develop in such condition, and several influential ...

    • Flexible Bulbous Bow Design - A Hydrodynamic Study 

      Watle, Andreas (Master thesis, 2017)
      With varying fuel costs and the pressure from International Maritime Organizations(IMO) Energy Efficient Design Index(EEDI) regulations regarding CO2 emissions, new economical and environmentally-friendly technologies are ...

    • Frequency Dependence of Bilge Keels 

      Orvedal, Simen Haugen (Master thesis, 2018)
      The goal of this master's thesis is to inspect the damping generated by bilge keels. Two dimensional cross sections have been modeled both with and without bilge keels and simulated using the computational fluid dynamics ...

    • Hydrodynamic Analysis of Paddle Wheel Propulsion 

      Pocheau-Lesteven, Malo Ange Baptiste (Master thesis, 2018)
      A Paddle wheel was the first device ever used to propel ships using steam engines as their primary source of power. Yet very little scientific study and assessment of this technology has ever been carried out. The aim of ...

    • Lattice Boltzmann Simulations on a GPU: An optimization approach using C++ AMP 

      Thyholdt, Kristoffer Clausen (Master thesis, 2012)
      The lattice Boltzmann method has become a valuable tool in computational fluid dynamics, one of the reasons is due to the simplicity of its coding. In order to maximize the performance potential of today s computers, code ...

    • 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 Modelling of Turbulent Boundary Layer 

      Hystad, Ida (Master thesis, 2014)
      Most physical problems involving viscous fluid flows are characterized by turbulence where instabilities and large velocity gradients generate fluctuations in the flow field. Towed sonar arrays are exposed to turbulence ...

    • Numerical Simulations of Flow Around a Bluff Body, Using Multigrid and an Immersed Boundary Method 

      Aarsnes, Marie Flø (Master thesis, 2017)
      Increase in computational efficiency is one of the most prominent factors for successful applications of large CFD models with many grid points. Consequences of the increase are reduction in CPU-time and memory usage, so ...

    • Numerical Simulations of Flow around a Simplified Hull Form 

      Emblemsvåg, Øyvind Andre Hagen (Master thesis, 2016)
      Hydrodynamic flow around a simplified hull form has been investigated using numerical simulations in OpenFOAM. The flow in question is three-dimensional and turbulent at a Reynolds number of 26,400. The base geometry is a ...

    • On the improvement of computational efficiency of smoothed particle hydrodynamics to simulate flexural failure of ice 

      Das, Jitapriya; Holm, Håvard (Journal article; Peer reviewed, 2018)
      The finite element method (FEM) has been extensively applied to model failure of ice but suffers from mesh distortion especially when fracture or fragmentation is involved. The smoothed particle hydrodynamics (SPH) method ...

    • Resistance analysis of trimaran service vessel using CFD 

      Hatlevik, Anita Solhaug (Master thesis, 2018)
      Service vessels within the aquaculture industry are normally designed as catamarans, however, the ships experience large resistance, where the contribution from wave resistance is dominant. In order to increase the ship ...

    • Seakeeping Analysis Comparison Between Viscous And Inviscid CFD 

      Vigsnes, Joakim Tveiten (Master thesis, 2018)
      With the global community's increased focus on a green and more sustainable environment, stricter demands are being invoked on ship design. Consequently, knowledge on how the vessel responds in a realistic sea-condition ...

    • Simulation of flow around a Viking ship rudder. 

      Heggem, Thomas (Master thesis, 2015)
      Computational fluid dynamics (CFD) is a numerical method of solving the Navier-Stokes equations for all points in a grid, or mesh. By performing this operation over multiple time steps, the resulting velocity and pressure ...

    • Simulation of Flow Around an Oil Boom 

      Bjørvik, Henning (Master thesis, 2015)
      The interFoam solver is used in this thesis. This solver applies the VOF method to trace the interface between two fluids. This method and the interFoam solver is thoroughly discussed in this thesis. A convergence study ...