• Alignment and rotation of spheroids in unsteady vortex flow 

      Jayaram, Rohith; Jie, Yucheng; Gillissen, Jurriaan J.J.; Zhao, Lihao; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2021)
      Preferential orientations of inertialess nonspherical particles are examined through three qualitatively different stages of a time-evolving Taylor–Green vortex flow. Despite an unexpected decorrelation between the vorticity ...
    • Analysis of the Turbulent Energy Dissipation 

      Førde, Olav Øyvind (Master thesis, 2012)
      An investigation of the turbulent fluctuating kinetic energy dissipation in low Reynolds number channel flow is made, both analytically and numerically with means of Direct Numerical Simulation (DNS). The unsteady Navier-Stokes ...
    • Bow Shock Clustering in Particle-laden Wetted Cylinder Flow 

      Shi, Zhaoyu; Jiang, Fengjian; Strandenes, Håkon; Zhao, Lihao; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2020)
      The inhomogeneous distributions of inertial particles in the unsteady flow around a wetted circular cylinder at Re=100 were investigated in one-way coupled three-dimensional numerical simulations. The Kármán vortex cells ...
    • CFD Analysis of the Flow around the Top Fin of the Flumill Tidal Turbine 

      Line, Håkon Bartnes (Master thesis, 2013)
      OpenFOAM is an open-source software suite which is available as a free download. The software is under rapid development, and is gaining a wide user base in both industry and academia. In the current project, OpenFOAM is ...
    • Clustering of inertial spheres in evolving Taylor-Green vortex flow 

      Jayaram, Rohith; Jie, Yucheng; Zhao, Lihao; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2020)
      Clustering of inertial spheres in a statistically unsteady flow field is believed to be different from particle clustering observed in statistically steady flows. The continuously evolving three-dimensional Taylor–Green ...
    • Comparison of LES and DNS for the flow past a circular cylinder with fairings 

      Strandenes, Håkon; Canabes, José Patricio Gallardo; Pettersen, Bjørnar; Andersson, Helge Ingolf (Peer reviewed, 2015)
    • Computation of impinging gas jets 

      Stuland, Eirik Martin (Master thesis, 2008)
      Abstract This dissertation has been produced during the spring semester of 2008 to serve to the requirements for the degree of Master of Technology at the Norwegian University of Science and Technology (NTNU). The thesis ...
    • Diameter ratio effects in the wake flow of single step cylinders 

      Tian, Cai; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2020)
      Vortex interactions behind step cylinders with diameter ratio 2 ≤ D/d ≤ 3 at Reynolds number (ReD) 150 were investigated by directly solving the three-dimensional Navier–Stokes equations. In accordance with the previous ...
    • Direct Numerical Simulation of Turbulent Channel Flow 

      Sebastian, Benjamin Clement (Master thesis, 2018)
      Several Direct Numerical Simulations (DNS) of a fully developed turbulent channel flow are performed. The aim of this thesis is to analyze how grid resolutions and domain sizes affect the turbulence statistics. The simulations ...
    • Direct numerical simulation of turbulent flow in a channel with transverse ribs 

      Marstein, Tor Holan (Master thesis, 2015)
      Surface roughness is of great relevance in most engineering applications, as very few surfaces can be regarded as perfectly smooth. Investigation of the effects on the mean flow, as well as the near wall turbulence is ...
    • Dynamics of disk-like particles in turbulent vertical channel flow 

      Yuan, Wenjun; Andersson, Helge Ingolf; Zhao, Lihao; Challabotla, Niranjan Reddy; Deng, Jianqiang (Journal article; Peer reviewed, 2017)
      The dynamical behavior of inertial disk-like particles in turbulent vertical channel flow is investigated by an Eulerian–Lagrangian point-particle approach. Gravity effects on distribution, translation, rotation and ...
    • Forces and torques on a prolate spheroid: low-Reynoldsnumber and attack angle effects 

      Andersson, Helge Ingolf; Jiang, Fengjian (Journal article; Peer reviewed, 2018)
      The three-dimensional flow field around a prolate spheroid has been obtained by integration of the full Navier–Stokes equations at Reynolds numbers 0.1, 1.0, and 10. The 6:1 spheroid was embedded in a Cartesian mesh by ...
    • Fractal modelling of turbulent flows: Subgrid modelling for the Burgers equation 

      Nilsen, Christopher (Master thesis, 2011)
      The stochastically forced Burgers equation shares some of the same characteristics as the three-dimensional Navier-Stokes equations. Because of this it is sometimes used as a model equation for turbulence. Simulating the ...
    • High-order overset grid method for detecting particle impaction on a cylinder in a cross flow 

      Aarnes, Jørgen Røysland; Haugen, Nils Erland L; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)
      An overset grid method was developed to investigate the interaction between a particle-laden flow and a circular cylinder. The method is implemented in the Pencil Code, a high-order finite-difference code for compressible ...
    • Inertial torque on a small spheroid in a stationary uniform flow 

      Jiang, Fengjian; Lihao, Zhao; Andersson, Helge Ingolf; Gustavsson, Kristian; Pumir, Alain; Mehlig, Bernhard (Peer reviewed; Journal article, 2021)
      How anisotropic particles rotate and orient in a flow depends on the hydrodynamic torque they experience. Here we compute the torque acting on a small spheroid in a uniform flow by numerically solving the Navier-Stokes ...
    • Influence of spanwise no-slip boundary conditions on the flow around a cylinder 

      Strandenes, Håkon; Pettersen, Bjørnar; Andersson, Helge Ingolf; Manhart, Michael (Journal article; Peer reviewed, 2017)
      First we present high resolution large eddy simulations (LES) for the flow past a circular cylinder at Reynolds number 3900 to prove the quality of the simulations. A thorough grid convergence study is presented, and the ...
    • Influences of upstream extensions on flow around a curved cylinder 

      Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2018)
      In simulations of flow around a concave curved cylinder, i.e. free-stream aligned with the plane of curvature and directed towards the inner face of the curvature, one cannot avoid interactions between the cylinder and the ...
    • 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 ...
    • MekIT’17 - Ninth national conference on Computational Mechanics 

      Skallerud, Bjørn Helge; Andersson, Helge Ingolf (Book, 2017)
    • Modelling of Rotating Turbulent Flows: Computer simulation of turbulent backward-facing step flow with system rotation 

      Gundersen, Ted Ørjan Kjellevik (Master thesis, 2011)
      An investigation of how different levels of turbulence modelling tackle the effects of system rotation has been performed. Ranging from simple one-equation models to large-eddy simulations, different approaches have been ...