dc.contributor |
Háskóli Íslands |
dc.contributor |
University of Iceland |
dc.contributor.author |
Costa, Pedro |
dc.contributor.author |
Brandt, Luca |
dc.contributor.author |
picano, francesco |
dc.date.accessioned |
2020-06-05T16:02:04Z |
dc.date.available |
2020-06-05T16:02:04Z |
dc.date.issued |
2019-11-29 |
dc.identifier.citation |
Costa, P., Brandt, L., & Picano, F. (2020). Interface-resolved simulations of small inertial particles in turbulent channel flow. Journal of Fluid Mechanics, 883, A54. doi:10.1017/jfm.2019.918 |
dc.identifier.issn |
0022-1120 |
dc.identifier.issn |
1469-7645 (eISSN) |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/1881 |
dc.description |
Publsiher's version (útgefin grein) |
dc.description.abstract |
We present a direct comparison between interface-resolved and one-way-coupled point-particle direct numerical simulations (DNS) of gravity-free turbulent channel flow laden with small inertial particles, with high particle-to-fluid density ratio and diameter of approximately three viscous units. The most dilute flow considered, solid volume fraction , shows the particle feedback on the flow to be negligible, whereas differences with respect to the unladen case, notably a drag increase of approximately 10 %, are found for a volume fraction. This is attributed to a dense layer of particles at the wall, caused by turbophoresis, flowing with large particle-to-fluid apparent slip velocity. The most dilute case is therefore taken as the benchmark for assessing the validity of a widely used point-particle model, where the particle dynamics results only from inertial and nonlinear drag forces. In the bulk of the channel, the first- and second-order moments of the particle velocity from the point-particle DNS agree well with those from the interface-resolved DNS. Close to the wall, however, most of the statistics show major qualitative differences. We show that this difference originates from the strong shear-induced lift force acting on the particles in the near-wall region. This mechanism is well captured by the lift force model due to Saffman (J. Fluid Mech., vol. 22 (2), 1965, pp. 385-400), while other widely used, more elaborate, approaches aiming at extending the lift model for a wider range of particle Reynolds numbers can actually underpredict the magnitude of the near-wall particle velocity fluctuations for the cases analysed here. |
dc.description.sponsorship |
We acknowledge PRACE for awarding us access to the supercomputer Marconi, based in Italy at CINECA under project 2017174185–DILPART, and the computing time provided by SNIC (Swedish National Infrastructure for Computing). This work was supported by the European Research Council grant no. ERC-2013-CoG-616186, TRITOS, the Swedish Research Council grant no. VR 2014-5001, and the grant BIRD192032/19 from the University of Padova. The authors acknowledge the anonymous referees for useful comments on an earlier version of the manuscript. B. Vreman, H. Kuerten and P. Pakseresht are also thanked for their feedback on an earlier version of the manuscript. |
dc.format.extent |
A54 |
dc.language.iso |
en |
dc.publisher |
Cambridge University Press (CUP) |
dc.relation.ispartofseries |
Journal of Fluid Mechanics;883 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Mechanical Engineering |
dc.subject |
Mechanics of Materials |
dc.subject |
Condensed Matter Physics |
dc.subject |
Multiphase flow |
dc.subject |
Particle/fluid flows |
dc.subject |
Vélaverkfræði |
dc.subject |
Þéttefnisfræði |
dc.title |
Interface-resolved simulations of small inertial particles in turbulent channel flow |
dc.type |
info:eu-repo/semantics/article |
dcterms.license |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited |
dc.description.version |
Peer Reviewed |
dc.identifier.journal |
Journal of Fluid Mechanics |
dc.identifier.doi |
10.1017/jfm.2019.918 |
dc.relation.url |
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022112019009182 |
dc.contributor.department |
Iðnaðarverkfræði-, vélaverkfræði- og tölvunarfræðideild (HÍ) |
dc.contributor.department |
Faculty of Industrial Eng., Mechanical Eng. and Computer Science (UI) |
dc.contributor.school |
Verkfræði- og náttúruvísindasvið (HÍ) |
dc.contributor.school |
School of Engineering and Natural Sciences (UI) |