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Buoyancy-Driven Flow through a Bed of Solid Particles Produces a New Form of Rayleigh-Taylor Turbulence
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9172-6311
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4346-4732
2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 22, article id 224501Article in journal (Refereed) Published
Abstract [en]

Rayleigh-Taylor (RT) fluid turbulence through a bed of rigid, finite-size spheres is investigated by means of high-resolution direct numerical simulations, fully coupling the fluid and the solid phase via a state-of-the-art immersed boundary method. The porous character of the medium reveals a totally different physics for the mixing process when compared to the well-known phenomenology of classical RT mixing. For sufficiently small porosity, the growth rate of the mixing layer is linear in time (instead of quadratical) and the velocity fluctuations tend to saturate to a constant value (instead of linearly growing). We propose an effective continuum model to fully explain these results where porosity originated by the finite-size spheres is parametrized by a friction coefficient.

Place, publisher, year, edition, pages
American Physical Society , 2018. Vol. 121, no 22, article id 224501
Keywords [en]
Computational fluid dynamics, Continuum mechanics, Friction, Mixing, Numerical methods, Porosity, Turbulence, Turbulent flow, Buoyancy driven flows, Continuum Modeling, Fluid turbulence, Friction coefficients, Immersed boundary methods, Rayleigh-Taylor turbulence, State of the art, Velocity fluctuations, Buoyancy
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247034DOI: 10.1103/PhysRevLett.121.224501ISI: 000451582500008Scopus ID: 2-s2.0-85057846030OAI: oai:DiVA.org:kth-247034DiVA, id: diva2:1330719
Note

QC 20190625

Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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Sardina, GaetanoBrandt, Luca

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