Abstract

Breakup of small aggregates in fully developed turbulence is studied by means ofdirect numerical simulations in a series of typical bounded and unbounded flowconfigurations, such as a turbulent channel flow, a developing boundary layer andhomogeneous isotropic turbulence. The simplest criterion for breakup is adopted,whereby aggregate breakup occurs when the local hydrodynamic stress  "1=2, with" being the energy dissipation at the position of the aggregate, overcomes a giventhreshold cr, which is characteristic for a given type of aggregate. Results show thatthe breakup rate decreases with increasing threshold. For small thresholds, it developsa scaling behaviour among the different flows. For high thresholds, the breakup ratesshow strong differences between the different flow configurations, highlighting theimportance of non-universal mean-flow properties. To further assess the effects offlow inhomogeneity and turbulent fluctuations, the results are compared with thoseobtained in a smooth stochastic flow. Furthermore, we discuss the limitations andapplicability of a set of independent proxies.

Autore Pugliese

• Lanotte Alessandra Sabina

Tutti gli autori

• M. Bäbler ; L. Biferale ; L. Brandt ; U. Feudel ; K. Guseva ; A. S. Lanotte ; C. Marchioli ;F. Picano ; G. Sardina ; A. Soldati ; F. Toschi

Titolo volume/Rivista

Journal of fluid mechanics

Anno di pubblicazione

2015

ISSN

0022-1120

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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