http://www.cnr.it/ontology/cnr/individuo/prodotto/ID184204
Statistical properties of vortical structures with spanwise vorticity in zero pressure gradient turbulent boundary layers (Articolo in rivista)
- Type
- Label
- Statistical properties of vortical structures with spanwise vorticity in zero pressure gradient turbulent boundary layers (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.2185684 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Di Felice Fabio (1); Camussi Roberto (2) (literal)
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- ISI Web of Science (WOS) (literal)
- Scopu (literal)
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- (1) INSEAN - Istituto Nazionale per Studi ed Esperienze di Architettura Navale;
(2) Università Roma \"Tre,\" DIMI (literal)
- Titolo
- Statistical properties of vortical structures with spanwise vorticity in zero pressure gradient turbulent boundary layers (literal)
- Abstract
- Turbulent boundary layers at large Reynolds numbers ?up to Re? =17 500? are obtained in a very
large recirculating water tunnel and are analyzed through PIV measurements in streamwise-wall-
normal planes. Vortical structures in the outer region are tracked using a wavelet based technique.
The adopted method, which can be applied also to time series obtained from pointwise
measurements, provides the separation of coherent structures from the background flow and the
measure of their length scale and of other relevant quantities. The range of Re? under test is
extended by analyzing also a PIV database obtained in a different laboratory flow ?public domain
data provided by Adrian and co-workers? at lower Re? ?1015 and 7700?. In this way, statistical
properties of the spanwise coherent structures are parametrically studied in terms of Re?. The
analysis of conditional vortices demonstrates the capability of the identification method to correctly
track the spanwise vortical structures, to determine their length scales and, at low Re?, to evidence
the formation of vortex packets. The probability distribution functions of relevant quantities ?such
as the length scale, the local energy, and the vorticity of the educed vortices? are shown to collapse
well when normalized with respect to low order statistical quantities ?mean and variance?. Analytical
approximations useful for extrapolating the observed statistical properties at a large Reynolds
number are also presented and discussed. (literal)
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