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Clustering and energy spectra in two-dimensional dusty gas turbulence
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 32019 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 100, no 1, article id 013114Article in journal (Refereed) Published
Abstract [en]

We present direct numerical simulation of heavy inertial particles (dust) immersed in two-dimensional turbulent flow (gas). The dust particles are modeled as monodispersed heavy particles capable of modifying the flow through two-way coupling. By varying the Stokes number (St) and the mass-loading parameter (phi(m)), we study the clustering phenomenon and the gas phase kinetic energy spectra. We find that the dust-dust correlation dimension (d(2)) also depends on phi(m). In particular, clustering decreases as mass loading (phi(m)) is increased. In the kinetic energy spectra of gas we show (i) the emergence of a different scaling regime and that (ii) the scaling exponent in this regime is not universal but a function of both St and phi(m). Using a scale-by-scale enstrophy budget analysis we show that in this emerged scaling regime, which we call the dust-dissipative range, viscous dissipation due to the gas balances the back-reaction from the dust.

Place, publisher, year, edition, pages
2019. Vol. 100, no 1, article id 013114
National Category
Physical Sciences Mathematics
Identifiers
URN: urn:nbn:se:su:diva-172002DOI: 10.1103/PhysRevE.100.013114ISI: 000477911900010OAI: oai:DiVA.org:su-172002DiVA, id: diva2:1346997
Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-08-29Bibliographically approved

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Mitra, Dhrubaditya
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