Phase-Average Mean Flow and Turbulence Structure in a Staggered Cylinder Array Subjected to Pulsating Cross-Flow

[+] Author and Article Information
E. Konstantinidis, S. Balabani, M. Yianneskis

Experimental and Computational Laboratory for the Analysis of Turbulence, Department of Mechanical Engineering, King’s College, London, Strand, WC2R 2LS, London, U.K.

J. Fluids Eng 126(3), 323-336 (Jul 12, 2004) (14 pages) doi:10.1115/1.1760538 History: Received April 25, 2003; Revised November 20, 2003; Online July 12, 2004
Copyright © 2004 by ASME
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Distributions of the periodic and total Reynolds stresses; (a) ũũ/Ub2, (b) ṽṽ/Ub2, (c) u⁁u⁁/Ub2 and (d) v⁁v⁁/Ub2.
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Comparison between unforced (open symbols) and forced flow (solid symbols) in terms of the time-averaged velocity statistics (a) streamwise mean velocity, (b) transverse mean velocity, (c) streamwise total rms velocity, and (d) transverse total rms velocity.
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The periodic and random Reynolds stress for ϕ=0 deg; (a) ũũ/Ub2, (b) ṽṽ/Ub2, (c) uu/Ub2, (d) vv/Ub2. Periodic mean velocity and the corresponding Reynolds stress as a function of phase-angle; (e) streamwise and (f ) transverse component.
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The turbulence kinetic energy field
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The instantaneous flow structure in the measurement region with superimposed phase-average mean velocity vectors: (a) ϕ=0 deg; (b) ϕ=12 deg
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The global flow pattern around the third row in the cylinder array. Flow direction is from top to bottom.
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Peak vorticity as a function of phase-angle
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Mean vorticity contours
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Sectional streamlines of the unsteady mean flow
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The pulsation waveform upstream of the cylinder array. Two pulsation cycles correspond to 360 deg (one vortex shedding cycle)
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Phase-average mean (a) and rms (b) velocities for a measurement location. The data before filtering (dots) exhibit statistical fluctuations which are removed with a low-pass filter. The filtered result yields improved estimation of the measured quantities and smooth curves. Cut-off frequency=100 Hz.
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The configuration of the cylinder array studied




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