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Record Details

Record 46 of 963
Continuous wavelet analysis of coherent structures
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Author and Affiliation:
Farge, M.(Ecole Normale Superieure, Paris, France)
Guezennec, Y.(Ohio State Univ., Columbus., United States)
Ho, C. M.(University of Southern California, Los Angeles., United States)
Meneveau, C.(Johns Hopkins Univ., Baltimore, MD., United States)
Abstract: We perform an analysis of planar cuts through three dimensional turbulent fields (planar channel flow and mixing layer) using the 2D continuous wavelet transform. We propose two new diagnostics: (1) a measure of intermittency I(r, vector x), which is the ratio of local energy and average energy at a given scale r; and (2) a local Reynolds number, defined on the local velocity contribution at a given scale, computed from the wavelet transform of the three velocity components, the scale of the transform, and molecular viscosity; this gives a representation of the local non-linearity of the flow viewed in both space and scale. We find, for the analyzed flows, strong small-scale intermittency located in the ejection regions for the channel flow and in the vortex core of the mixing layer.
Publication Date: Dec 01, 1990
Document ID:
19920021429
(Acquired Nov 07, 1995)
Accession Number: 92N30673
Subject Category: FLUID MECHANICS AND HEAT TRANSFER
Document Type: Conference Paper
Publication Information: Stanford Univ., Studying Turbulence Using Numerical Simulation Databases. 3: Proceedings of the 1990 Summer Program; p 331-348
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Ecole Normale Superieure; Paris, France
Description: 18p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: CHANNEL FLOW; FLUID DYNAMICS; MIXING LAYERS (FLUIDS); STRUCTURAL ANALYSIS; TURBULENT FLOW; VISCOSITY; VORTICES; EJECTION; INTERMITTENCY; REYNOLDS NUMBER
Imprint And Other Notes: In Stanford Univ., Studying Turbulence Using Numerical Simulation Databases. 3: Proceedings of the 1990 Summer Program p 331-348 (SEE N92-30648 21-34)
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