二次元後向きステップ流れの再付着領域における流動特性(流体工学,流体機械)

概要

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Many experiments have been performed to study the flow structure around the reattachment region of a two-dimensional backward facing step. This flow field has a large-scale vortex structure with low-frequency fluctuation involving one of instantaneous reattachment point. To clarify these structures, in this experiment, time series velocity profile is measured using an advanced multi-point LDV system and behavior of separated shear layer and reattachment phenomena is visualized clearly. A velocity at the vicinity of the step wall increases rapidly when the separated shear layer reached to the step wall passes the measuring region. A frequency of this event is in good agreement with the one of the flapping of the separated shear layer. There are two patterns of when the velocity direction changes from positive to negative on the step wall around a reattachment region.
社団法人日本機械学会の論文
2003-01-25