Dynamics of secondary flow behind backward-facing step in a narrow channel
Institute of Thermomechanics, ASCR, v.v.i., Dolejskova 5, Praha 8, Czech Republic
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Published online: 25 March 2014
Dynamics of the flow-field behind a backward-facing step in a narrow channel is studied experimentally using time resolved PIV technique. Secondary flow represented by vortical structures is studied using Oscillation Pattern decomposition technique. The low-frequency quasi-periodical structures appearing in the region just behind the step close to the channel bottom are studied. Typical dynamics of vortex structures involving contra-rotating vortex pair train, vortices coalescence and splitting have been observed.
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