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Simulation of finite-size fibers in turbulent channel flows
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Fysiokemisk strömningsmekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0003-2830-0454
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Fysiokemisk strömningsmekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0003-3336-1462
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Turbulens. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-9819-2906
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Turbulens. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-2711-4687
2014 (Engelska)Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 89, nr 1, s. 013006-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The dynamical behavior of almost neutrally buoyant finite-size rigid fibers or rods in turbulent channel flow is studied by direct numerical simulations. The time evolution of the fiber orientation and translational and rotational motions in a statistically steady channel flow is obtained for three different fiber lengths. The turbulent flow is modeled by an entropy lattice Boltzmann method, and the interaction between fibers and carrier fluid is modeled through an external boundary force method. Direct contact and lubrication force models for fiber-fiber interactions and fiber-wall interaction are taken into account to allow for a full four-way interaction. The density ratio is chosen to mimic cellulose fibers in water. It is shown that the finite size leads to fiber-turbulence interactions that are significantly different from earlier reported results for point like particles (e.g., elongated ellipsoids smaller than the Kolmogorov scale). An effect that becomes increasingly accentuated with fiber length is an accumulation in high-speed regions near the wall, resulting in a mean fiber velocity that is higher than the mean fluid velocity. The simulation results indicate that the finite-size fibers tend to stay in the high-speed streaks due to collisions with the wall. In the central region of the channel, long fibers tend to align in the spanwise direction. Closer to the wall the long fibers instead tend to toward to a rotation in the shear plane, while very close to the wall they become predominantly aligned in the streamwise direction.

Ort, förlag, år, upplaga, sidor
2014. Vol. 89, nr 1, s. 013006-
Nyckelord [en]
Lattice-Boltzmann Method, Ellipsoidal Particles, Shear-Flow, Numerical-Simulation, Drag Reduction, Viscous-Fluid, Orientation, Motion
Nationell ämneskategori
Teknisk mekanik
Identifikatorer
URN: urn:nbn:se:kth:diva-144003DOI: 10.1103/PhysRevE.89.013006ISI: 000332160600013Scopus ID: 2-s2.0-84894594301OAI: oai:DiVA.org:kth-144003DiVA, id: diva2:710042
Forskningsfinansiär
Vetenskapsrådet, 2011-5355 2010-3938 2010-4147 2010-6965
Anmärkning

QC 20140404

Tillgänglig från: 2014-04-04 Skapad: 2014-04-04 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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Do-Quang, MinhAmberg, GustavBrethouwer, GertJohansson, Arne V.

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Do-Quang, MinhAmberg, GustavBrethouwer, GertJohansson, Arne V.
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Fysiokemisk strömningsmekanikLinné Flow Center, FLOWTurbulens
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Physical Review E. Statistical, Nonlinear, and Soft Matter Physics
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