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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

SPACE-TIME CORRELATIONS IN SEPARATED FLOW BEHIND A SURFACE MOUNTED OBSTACLE

Bard Venas
Department of Mechanics, Thermo and Fluid Dynamics Norwegian University of Science and Technology N-7034 Trondheim, Norway

Lars R. Saetran
Department of Mechanics, Thermo and Fluid Dynamics Norwegian University of Science and Technology N-7034 Trondheim, Norway

Abstract

Autocorrelations and two-point correlations are reported from separated flow behind a surface mounted triangular cylinder, using both pulsed and conventional hot-wire anemometry. Autocorrelations and spectra reveal separate large scales throughout the flow, notably, scales owing to vortex shedding from the separation and very low frequency fluctuations. Two-point correlations indicate considerable correlation between the backflow and the outer flow. Both vortex shedding and large-scale fluctuations are detected in these measurements, indicating that these features affect the whole of the flow.