Browsing NTNU Open by Author "Andersson, Helge Ingolf"
Now showing items 21-40 of 54
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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 ... -
An integral model based on slender body theory, with applications to curved rigid fibers
Andersson, Helge Ingolf; Celledoni, Elena; Ohm, Laurel; Owren, Brynjulf; Tapley, Benjamin (Peer reviewed; Journal article, 2021)We propose a novel integral model describing the motion of both flexible and rigid slender fibers in viscous flow and develop a numerical method for simulating dynamics of curved rigid fibers. The model is derived from ... -
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 ... -
Modulation of turbulent channel flow laden with contaminated microbubbles
Malla, Majed A. Osama El-Majzoub Det (Master thesis, 2013)Examining the interaction between microbubbles and turbulence in vertical channel flow is done in this thesis. An Eulerian?Lagrangian approach based on pseudo-spectral direct numerical simulation is used. Babbles, due 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 ... -
A novel approach to rigid spheroid models in viscous flows using operator splitting methods
Tapley, Benjamin; Celledoni, Elena; Owren, Brynjulf; Andersson, Helge Ingolf (Peer reviewed; Journal article, 2019)Calculating cost-effective solutions to particle dynamics in viscous flows is an important problem in many areas of industry and nature. We implement a second-order symmetric splitting method on the governing equations for ... -
Numerical investigation of free-stream turbulence effects on the transition-in-wake state of flow past a circular cylinder
Aarnes, Jørgen Røysland; Andersson, Helge Ingolf; Haugen, Nils Erland L (Journal article; Peer reviewed, 2018)We investigate how a turbulent free-stream (TFS) affects the transition-in-wake state of flow past a cylinder. Direct numerical simulations of a decaying TFS flow past a cylinder have been performed, where the intensity ... -
Numerical Solutions of Three- Dimensional Von Kármán and Bödewadt Heat and Fluid Flow Problems
Rahman, Muhammad (Doctoral theses at NTNU;2018:77, Doctoral thesis, 2018) -
Numerical studies of viscous flow around straight and curved tandem cylinders
Aasland, Tale Egeberg (Doctoral theses at NTNU;2024:81, Doctoral thesis, 2024)The physics of flow around straight and curved cylinders in tandem is investigated by means of direct numerical simulations (DNS), for transitional and turbulent flow regimes. For straight tandem cylinders in the reattachment ... -
Numerisk simulering av strømning omkring anisotrope partikler
Hanssen-Bauer, Øyvind W (Master thesis, 2013)I denne studien er uniform strømning og lineær skjærstrømning omkring partikler ved lave Reynoldstall simulert ved hjelp av den åpne programvaren OpenFOAM. Fra resultatene framkommer det at ved uniform strømning avtar ... -
Numerisk simulering av strømning omkring anisotrope partikler
Hanssen-Bauer, Øyvind W (Master thesis, 2013)I denne studien er uniform strømning og lineær skjærstrømning omkring partikler ved lave Reynoldstall simulert ved hjelp av den åpne programvaren OpenFOAM. Fra resultatene framkommer det at ved uniform strømning avtar ... -
On heat transfer in Bödewadt flow
Rahman, Muhammad; Andersson, Helge Ingolf (Journal article, 2017)Heat transfer in revolving Bo¨dewadt flow above a planar surface has been considered. We have shown that a similarity solution of the thermal energy problem does not exist as long as the surface is impermeable. The failure ... -
On the Effect of Boundary Conditions on the Flow around a Cylinder in a Channel
Strandenes, Håkon; Canabes, José Patricio Gallardo; Pettersen, Bjørnar; Andersson, Helge Ingolf (Chapter, 2015)In this paper, the incompressible external flow around an offshore drilling riser with fairings at Reynolds number 5000 is used to study the effects of varying boundary conditions in numerical simulations. We use a direct ... -
On vortex shedding from a hexagonal cylinder
Khaledi, Alidoosti Hatef; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2011) -
Particle segregation in turbulent Couette-Poiseuille flow with vanishing wall shear
Yang, Kun; Zhao, Lihao; Andersson, Helge Ingolf (Journal article, 2017)Inertial particles dispersed in wall-bounded flows in pipes and channels are known to accumulate close to the walls. The segregation ability depends greatly on the inertia-selection effects of the near-wall quasi-coherent ... -
Preferential orientation of tracer spheroids in turbulent channel flow
Jie, Yucheng; Zhao, Lihao; Xu, Chunxiao; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)Axis-symmetric spheroids, such as rod-like and disk-like particles, have been found to orient preferentially in near-wall turbulence by both experiment and numerical simulation. In current work we examined the orientation ... -
Preferential particle concentration in wall-bounded turbulence with zero skin friction
Yang, Kun; Zhao, Lihao; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2017)Inertial particles dispersed in turbulence distribute themselves unevenly. Besides their tendency to segregate near walls, they also concentrate preferentially in wall-parallel planes. We explore the latter phenomenon in ...