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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

LARGE-SCALE DYNAMICS IN THE FLOW AROUND A FINITE CYLINDER WITH GROUND PLATE

pages 1331-1336
DOI: 10.1615/TSFP6.2120
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RÉSUMÉ

To date physically meaningful representations of the non-stationarity in complex 3D flows with converged turbulent statistics are scarce and shed little light on the nonlinear processes in turbulent motion. This study attempts to address part of this deficit by concentrating on the kinematics of larger scales of motion. Two methods are utilised to describe the kinematics of large-scale unsteady motion in the flow around a wall-mounted finite circular cylinder at Reynolds number of ReD = 200 000. The first, Proper Orthogonal Decomposition (POD), is a global method resulting in spatial modes defined over the whole domain and their corresponding temporal coefficients. The second, Coherent Structure Tracking (CST), belongs to a class of local methods which extracts connected domains in the flow data.
Based on time coefficients of the first dominant mode pair provided by POD phase-averaging has been performed. Furthermore, modes specific for distinct harmonics are extracted by temporal harmonic filtering. A scalar-field version of CST is proposed yielding an intuitively more accessible description of the flow. The extent to which POD and CST are complimentary is discussed, as well as which partially overlap.

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