Anders Helgeland

• Linge, Svein; Mardal, Kent-Andre; Helgeland, Anders; Heiss, John D. & Haughton, Victor (2014). Effect of craniovertebral decompression on CSF dynamics in Chiari malformation Type I studied with computational fluid dynamics. Journal of Neurosurgery : Spine. ISSN 1547-5654. 21(4), p. 559–564. doi: 10.3171/2014.6.SPINE13950.
• Helgeland, Anders; Mardal, Kent-Andre; Haughton, Victor & Reif, Bjørn Anders Pettersson (2014). Numerical simulations of the pulsating flow of cerebrospinal fluid flow in the cervical spinal canal of a Chiari patient. Journal of Biomechanics. ISSN 0021-9290. 47(5), p. 1082–1090. doi: 10.1016/j.jbiomech.2013.12.023.
• Linge, Svein; Mardal, Kent-Andre; Haughton, Victor & Helgeland, Anders (2013). Simulating CSF flow dynamics in the normal and chiari I subarachnoid space during rest and exertion. American Journal of Neuroradiology. ISSN 0195-6108. 34(1), p. 41–45. doi: 10.3174/ajnr.A3282.
• Linge, Svein; Haughton, Victor; Løvgren, Alf Emil; Mardal, Kent-Andre; Helgeland, Anders & Langtangen, Hans Petter (2011). Effect of Tonsillar Herniation on Cyclic CSF Flow Studied with Computational Flow Analysis. American Journal of Neuroradiology. ISSN 0195-6108. 32, p. 1474–1481. doi: 10.3174/ajnr.A2496. Full text in Research Archive
• (2011). VoluViz: a multi-field volume visualization framework for three-dimensional data analysis. In Skallerud, Bjørn Helge & Andersson, Helge Ingolf (Ed.), MekIT'11: Sixth National Conference on Computational Mechanics, Trondheim 23-24 May 2011. Tapir Akademisk Forlag. ISSN 978-82-519-2798-7. p. 127–138.
• Elboth, Thomas; Wasberg, Carl Erik; Helgeland, Anders; Andreassen, Øyvind & Reif, Bjørn Anders Pettersson (2009). Flow noise simulation around a cylinder. In Skallerud, Bjørn Helge & Andersson, Helge Ingolf (Ed.), MekIT'09 : Fifth National Conference on Computational Mechanics, Trondheim 26-27 May 2009. Tapir Akademisk Forlag. ISSN 978-82-519-2421-4. p. 151–168.
• Elboth, Thomas; Helgeland, Anders; Andreassen, Øyvind & Reif, Bjørn Anders Pettersson (2009). Flow noise simulation around a cylinder. In Skallerud, Bjørn Helge & Andersson, Helge Ingolf (Ed.), MekIT'09 : Fifth National Conference on Computational Mechanics, Trondheim 26-27 May 2009. Tapir Akademisk Forlag. ISSN 978-82-519-2421-4. p. 151–168.
• (2007). Visualization of vorticity and vortices in wall-bounded turbulent flows. IEEE Transactions on Visualization and Computer Graphics. ISSN 1077-2626. 13(5), p. 1055–1066. doi: 10.1109/TVCG.2007.1062. Show summary

  This study was initiated by the scientifically interesting prospect of applying advanced visualization techniques to gain further insight into various spatio-temporal characteristics of turbulent flows. The ability to study complex kinematical and dynamical features of turbulence provides means of extracting the underlying physics of turbulent fluid motion. The objective is to analyze the use of a vorticity field line approach to study numerically generated incompressible turbulent flows. In order to study the vorticity field, we present a field line animation technique that uses a specialized particle advection and seeding strategy. Efficient analysis is achieved by decoupling the rendering stage from the preceding stages of the visualization method. This allows interactive exploration of multiple fields simultaneously, which sets the stage for a more complete analysis of the flow field. Multifield visualizations are obtained using a flexible volume rendering framework, which is presented in this paper. Vorticity field lines have been employed as indicators to provide a means to identify "ejection" and "sweep" regions, two particularly important spatio-temporal events in wall-bounded turbulent flows. Their relation to the rate of turbulent kinetic energy production and viscous dissipation, respectively, has been identified.

• (2007). On Vorticity, vortices and material lines in turbulent channel flow. In Palma, J.M.L.M. & Lopes, A. Silva (Ed.), Advances in Turbulence XI, Proceedings of the 11th European Turbulence Conference. Springer. ISSN 978-3-540-72603-6. p. 767–767.
• (2007). On Vorticity and Vortices in Wall-Bounded Turbulent Flows. In Skallerud, B. & Andersson, H.I. (Ed.), MEKIT'07 Fourth National Conference on Computational Mechanics. Tapir Akademisk Forlag. ISSN 978-82-519-2235-7. p. 163–174.
• Helgeland, Anders & Elboth, Thomas (2006). High-quality and interactive animations of 3D time-varying vector fields. IEEE Transactions on Visualization and Computer Graphics. ISSN 1077-2626. 12, p. 1535–1546.
• (2004). Visualization of Vector Fields Using Seed LIC and Volume Rendering. IEEE Transactions on Visualization and Computer Graphics. ISSN 1077-2626. 10(6), p. 673–682. doi: 10.1109/TVCG.2004.49.

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• (2019). Modelling of flow-induced vibrations in a thin towed antenna.
• Mardal, Kent-Andre; Helgeland, Anders; Haugthon, Victor; Reif, Anders & Støverud, Karen-Helene (2014). On the assumption of laminar flow of CSF in Chiari patients.
• Linge, Svein; Mardal, Kent-Andre; Haughton, Victor & Helgeland, Anders (2011). Cerebrospinal fluid flow characteristics at double heart rate.
• Gibson, Max; Helgeland, Anders; Tutkun, Murat & Cal, Raul B. (2010). Classification of critical points in a turbulent boundary layer.
• Helgeland, Anders; Andreassen, Øyvind; Ommundsen, Atle; Reif, Bjørn Anders Pettersson; Werne, Joseph & Gaarder, Trond (2004). Visualization of the energy-containing turbulent scales.
• Waaler, Hans Thomas; Helgeland, Anders; Hjort, Peter Fredrik; Lund-Johansen, Per; Lund-Larsen, Per & Mathisen, Reidar (1978). Høyt blodtrykk : behandlingsprogram, utbytte, kostnader. Norges allmennvitenskapelige forskningsråd's gruppe for helsetjenesteforskning. ISSN 82-7216-031-5.

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