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Simulazione delle Grandi Scale (LES) di Flussi Turbolenti in Condotti a Sezione Circolare
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Curvature and velocity strain dependencies of burning speed in a turbulent premixed jet flame
No full textSmall scale isotropy and universality of axisymmetric jets
Full text linkThis paper addresses the long-standing debate about whether the
asymptotic jet can be universal. It is argued that the ansatz of a
universal spreading rate is inconsistent with more accurate and recent
measurements where the scatter in the opening angle is found to exceed
the experimental accuracy, implying a true lack of universality in these
basic quantities. A universal scaling theory may still be proposed by
including the spreading rate in the similarity transformations. We will
show that this approach leads to a conflict with the presumed recovery
of isotropy in the dissipative scales of the flow. The issue is
addressed here by using direct numerical simulations of free-jets to
finally show that a complete universality is also incompatible with the
experimental data available in the literature. (C) 2007 American
Institute of Physics
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