Flow structures in the developing region of a symmetric wake and unsymmetric wake.

J. J. Miau, S. K.F. Karlsson

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3 Citations (Scopus)

Abstract

A conditional sampling technique was designed and employed to determine the ensemble averaged flow structures in the developing region of a symmetric wake (r=1.0) and an unsymmetric wake (r=0.5). It was found that at a velocity ratio of 0.5 the large scale structure, which was observed from a reference frame travelling with its phase speed, is initially confirmed in the high speed stream, elongated in the stream direction, and is shaped elliptically. As the flow convects downstream it grows in the cross steam direction, as well as tilting towards the wake centre, and then evolves into a nearly circular shape. Results for a velocity ratio of 1.0, corresponding to the case of a 2 D wake flow, show that two rows of counterrotating vortices develop in two streams originating in the linear instability region. Similar to the case for r=0.5, these vortices grow, as well as tilt, when the flow convects them downstream. However, the growth rate of these flow structures is slower than that of the case for r=0.5. (A)

Original languageEnglish
Pages (from-to)2389-2399
Number of pages11
JournalPHYS. FLUIDS
Volume30
Issue number8 , Aug. 1987
DOIs
Publication statusPublished - 1987 Jan 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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