Breakup of small aggregates in fully developed turbulence is studied by means of direct numerical simulations in a series of typical bounded and unbounded ﬂow conﬁgurations, such as a turbulent channel ﬂow, a developing boundary layer, and homogeneous isotropic turbulence. The simplest criterion for breakup is adopted, whereby aggregate breakup occurs when the local hydrodynamic stress σ ∼ ε1/2, with ε being the energy dissipation at the position of the aggregate, overcomes a given threshold σcr, which is characteristic for a given type of aggregate. Results show that the breakup rate decreases with increasing threshold. For small thresholds, it develops a scaling behaviour among the diﬀerent ﬂows. For high thresholds, the breakup rates show strong diﬀerences between the diﬀerent ﬂow conﬁgurations, highlighting the importance of non-universal mean-ﬂow properties. To further assess the eﬀects of ﬂow inhomogeneity and turbulent ﬂuctuations, the results are compared with those obtained in a smooth stochastic ﬂow. Furthermore, we discuss the limitations and applicability of a set of independent proxies.
Babler, M., Biferale, L., Brandt, L., Feudel, U., Guseva, K., Lanotte, A., et al. (2015). Numerical simulations of aggregate breakup in bounded and unbounded turbulent flows. JOURNAL OF FLUID MECHANICS, 766(2), 104-128 [10.1017/jfm.2015.13].
|Tipologia:||Articolo su rivista|
|Citazione:||Babler, M., Biferale, L., Brandt, L., Feudel, U., Guseva, K., Lanotte, A., et al. (2015). Numerical simulations of aggregate breakup in bounded and unbounded turbulent flows. JOURNAL OF FLUID MECHANICS, 766(2), 104-128 [10.1017/jfm.2015.13].|
|IF:||Con Impact Factor ISI|
|Settore Scientifico Disciplinare:||Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici|
|Revisione (peer review):||Esperti anonimi|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1017/jfm.2015.13|
|Stato di pubblicazione:||Pubblicato|
|Data di pubblicazione:||2015|
|Titolo:||Numerical simulations of aggregate breakup in bounded and unbounded turbulent flows|
|Autori:||Babler, M; Biferale, L; Brandt, L; Feudel, U; Guseva, K; Lanotte, A; Marchioli, C; Picano, F; Sardina, G; Soldati, A; Toschi, F|
|Appare nelle tipologie:||01 - Articolo su rivista|