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ANZIAM J. 46(E) ppC117--C132, 2005.

Separating, transitional flow affected by various inflow oscillation regimes

J. G. Wissink

(Received 13 November 2004, revised 25 February 2005)

Abstract

Consider the direct numerical simulations of laminar separation bubble flow with oscillating oncoming flow. We explore the influence of the amplitude and the period of the inflow oscillation on the dynamics of the separation bubble. The oscillating inflow causes the location of separation and the location of transition to alternately move upstream and downstream. For all simulations, in every period a new separation bubble is formed as the inflow decelerates. The growth-rate of the triggered Kelvin--Helmholtz instability depends on both the amplitude and the period of the inflow-oscillation.

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Authors

J. G. Wissink

Institute for Hydromechanics, University of Karlsruhe, Karlsruhe, Germany. mailto:wissink@ifh.uni-karlsruhe.de

Published April 6, 2005. ISSN 1446-8735

References

1. M. Alam and N. D. Sandham. Direct Numerical Simulation of 'short' laminar separation bubbles with turbulent reattachment. J. Fluid Mech., 410:1--28, 2000. URL link.
2. U. Maucher and U. Rist and M. Kloker and S. Wagner. DNS of laminar-turbulent transition in separation bubbles. In E. Krause and W. Jager, editors, High-Performance Computing in Science and Engineering, Springer, 2000.
3. P. R. Spalart and M. Kh. Strelets. Mechanisms of transition and heat transfer in a separation bubble. J. Fluid Mech., 403:329--349, 2000. URL link.
4. J. G. Wissink and W. Rodi. DNS of transition in a laminar separation bubble. In I. P. Castro and P.E. Hancock, editors, Advances in Turbulence IX, proceedings of the Ninth European Turbulence Conference, CIMNE, 2002.
5. J. G. Wissink and W. Rodi. DNS of a laminar separation bubble in the presence of oscillating flow. Flow, Turbulence and Combustion, 71:311--331, 2003.
6. J. G. Wissink and V. Michelassi and W. Rodi. Heat transfer in a laminar separation bubble affected by oscillating external flow. Int. J. of Heat and Fluid Flow, 25:729--740, 2004. http://dx.doi.org/10.1016/j.ijheatfluidflow.2004.04.005