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  • Journal of Fluid Mechanics, Volume 611
  • September 2008, pp. 1-11

Experimental and numerical investigation of the kinematic theory of unsteady separation

  • M. WELDON (a1), T. PEACOCK (a1), G. B. JACOBS (a2), M. HELU (a1) and G. HALLER (a1)
  • DOI:
  • Published online: 25 September 2008

We present the results of a combined experimental and numerical study of flow separation in the unsteady two-dimensional rotor-oscillator flow. Experimentally detected material spikes are directly compared to separation profiles predicted from numerical shear-stress and pressure data, using a recent kinematic theory of unsteady separation. For steady, periodic, quasi-periodic and random forcing, fixed separation is observed, and experimental observations and theoretical predictions are in close agreement. The transition from fixed to moving separation is also reported.

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M. S. Kilic , G. Haller & A. Neishtadt 2005 Unsteady fluid slow separation by the method of averaging. Phys. Fluids 17, 067104

C. S. Liu & Y.-H. Wan 1985 A simple exact solution of the Prandtl boundary layer equations containing a point of separation. Arch. Rat. Mech. Anal. 89, 177185.

W. R. Sears & D. P. Telionis 1975 Boundary-layer separation in unsteady flow. SIAM J. Appl. Maths 28, 215235.

T. Yuster & W. W. Hackborn 1997 On invariant manifolds attached to oscillating boundaries of Stokes flows. Chaos 7, 769776.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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