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Flowing fibers as a...
Flowing fibers as a proxy of turbulence statistics
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- Rosti, Marco E. (författare)
- KTH,Mekanik,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre
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- Olivieri, S. (författare)
- DICCA, University of Genova, Via Montallegro 1, Genova, 16145, Italy ; INFN, Genova Section, Via Dodecaneso 33, Genova, 16146, Italy
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- Banaei, Arash Alizad (författare)
- KTH,Mekanik,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre
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- Brandt, Luca (författare)
- KTH,Mekanik,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre
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- Mazzino, A. (författare)
- DICCA, University of Genova, Via Montallegro 1, Genova, 16145, Italy ; INFN, Genova Section, Via Dodecaneso 33, Genova, 16146, Italy
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(creator_code:org_t)
- 2019-06-13
- 2020
- Engelska.
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Ingår i: Meccanica (Milano. Print). - : Springer Netherlands. - 0025-6455 .- 1572-9648. ; 55, s. 357-370
- Relaterad länk:
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https://doi.org/10.1...
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https://link.springe...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The flapping states of a flexible fiber fully coupled to a three-dimensional turbulent flow are investigated via state-of-the-art numerical methods. Two distinct flapping regimes are predicted by the phenomenological theory recently proposed by Rosti et al. (Phys. Rev. Lett. 121:044501, 2018) the under-damped regime, where the elasticity strongly affects the fiber dynamics, and the over-damped regime, where the elastic effects are strongly inhibited. In both cases we can identify a critical value of the bending rigidity of the fiber by a resonance condition, which further provides a distinction between different flapping behaviors, especially in the under-damped case. We validate the theory by means of direct numerical simulations and find that, both for the over-damped regime and for the under-damped one, fibers are effectively slaved to the turbulent fluctuations and can therefore be used as a proxy to measure various two-point statistics of turbulence. Finally, we show that this holds true also in the case of a passive fiber, without any feedback force on the fluid.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Dispersed flows
- Fiber
- Multiphase flows
- Turbulence
- Multiphase flow
- Numerical methods
- Dispersed flow
- Flapping behavior
- Phenomenological theory
- Resonance condition
- Three-dimensional turbulent flow
- Turbulence statistics
- Turbulent fluctuation
- Two point statistics
- Fibers
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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