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A study of a flexib...
A study of a flexible fiber model and its behavior in DNS of turbulent channel flow
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- Andric, Jelena, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Fluid Mechanics
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- Fredriksson, Sam, 1966 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences,University of Gothenburg,Chalmers University of Technology,Fluid Mechanics
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- Lindström, S. B. (author)
- Linköpings universitet,Mekanik,Tekniska högskolan,Chalmers University of Technology,Fluid Mechanics
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- Sasic, Srdjan, 1968 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nilsson, Håkan, 1971 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Fluid Mechanics
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(creator_code:org_t)
- 2013-07-26
- 2013
- English.
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In: Acta Mechanica. - : Springer Science and Business Media LLC. - 0001-5970 .- 1619-6937. ; 224:10, s. 2359-2374
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Abstract
Subject headings
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- 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
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
Keyword
- flexible fiber model
- Direct Numerical Simulation (DNS)
- CFD
- flexible fiber model
Publication and Content Type
- ref (subject category)
- art (subject category)
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