The eduction of structures from flow imagery using wavelets. I - The mixing layer

Kailas, SV and Narasimha, R (1999) The eduction of structures from flow imagery using wavelets. I - The mixing layer. Experiments in Fluids, 27 (2). pp. 167-174. ISSN 0723-4864

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    Abstract

    Using two-dimensional Mexican hat wavelets, digitized imagery from the flow visualization pictures of a mixing layer by Brown and Roshko have been analyzed. The objective of the present study is to 'calibrate'the proposed wavelet technique for educing structures in a flow whose large-scale organization is well established. It is found that, with appropriate thresholds on wavelet-transform coefficients, considerable insight into the structure of the flow at different scales can be obtained. In particular, the analysis reveals that the small-scale structure within the large-scale vortices is approximately homogeneous, and has characteristic scales that do not vary significantly with downstream distance.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to Springer-Verlag
    Uncontrolled Keywords: Wavelet transforms;Mixing layers (Fluids);Digital imagery;Turbulent flow;Laminar flow;Vortices
    Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
    Division/Department: Centre for Civil Aircraft Design and Development, Other
    Depositing User: M/S ICAST NAL
    Date Deposited: 21 Jan 2008
    Last Modified: 07 Jun 2010 15:54
    URI: http://nal-ir.nal.res.in/id/eprint/4282

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