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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

NUMERICAL INVESTIGATION OF THE STABILITY AND CONTROL OF SEPARATING BOUNDARY-LAYER FLOW

pages 413-417
DOI: 10.1615/TSFP2.1430
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RESUMO

A boundary-layer flow along a bump is investigated numerically. At the rear of the bump the flow separates and the separation bubble becomes unstable above a critical Reynolds number. The resulting vortex shedding is reproduced numerically. Performing a local linear stability analysis of velocity profiles inside the separation bubble, it is shown that there is a relationship between a local absolute instability and the numerically observed global flow behaviour. First numerical experiments of flow control, reducing the recirculation length using blowing and suction, are performed as well.

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