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  • Andric, Jelena,1979Chalmers tekniska högskola,Chalmers University of Technology,Fluid Mechanics (author)

A study of a flexible fiber model and its behavior in DNS of turbulent channel flow

  • Article/chapterEnglish2013

Publisher, publication year, extent ...

  • 2013-07-26
  • Springer Science and Business Media LLC,2013
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:gup.ub.gu.se/178004
  • https://gup.ub.gu.se/publication/178004URI
  • https://doi.org/10.1007/s00707-013-0918-yDOI
  • https://research.chalmers.se/publication/178004URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-48655URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98106URI

Supplementary language notes

  • Language:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • The dynamics of individual flexible fibers in a turbulent flow field have been analyzed, varying their initial position, density and length. A particlelevel fiber model has been integrated into a general-purpose, open source Computational Fluid Dynamics (CFD) code. The fibers are modeled as chains of cylindrical segments connected by ball and socket joints. The equations of motion of the fibers contain the inertia of the segments, the contributions from hydrodynamic forces and torques, and the connectivity forces at the joints. Direct Numerical Simulation (DNS) of the incompressible Navier–Stokes equations is used to describe the fluid flow in a plane channel and a one-way coupling is considered between the fibers and the fluid phase. We investigate the translational motion of fibers by considering the mean square displacement of their trajectories. We find that the fiber motion is primarily governed by velocity correlations of the flow fluctuations. In addition, we show that there is a clear tendency of the thread-like fibers to evolve into complex geometrical configurations in a turbulent flow field, in fashion similar to random conformations of polymer strands subjected to thermal fluctuations in a suspension. Finally, we show that fiber inertia has a significant impact on reorientation time-scales of fibers suspended in a turbulent flow field.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Fredriksson, Sam,1966Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences,University of Gothenburg,Chalmers University of Technology,Fluid Mechanics(Swepub:gu)xfreds (author)
  • Lindström, S. B.Linköpings universitet,Mekanik,Tekniska högskolan,Chalmers University of Technology,Fluid Mechanics(Swepub:liu)steli60 (author)
  • Sasic, Srdjan,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)srdjan (author)
  • Nilsson, Håkan,1971Chalmers tekniska högskola,Chalmers University of Technology,Fluid Mechanics(Swepub:cth)hani (author)
  • Chalmers tekniska högskolaChalmers University of Technology (creator_code:org_t)

Related titles

  • In:Acta Mechanica: Springer Science and Business Media LLC224:10, s. 2359-23740001-59701619-6937

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