Journal of Fluid Mechanics

Papers

Experimental and numerical investigation of the kinematic theory of unsteady separation

M. WELDONa1, T. PEACOCKa1, G. B. JACOBSa2, M. HELUa1 and G. HALLERa1

a1 Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 1-310, Cambridge, MA 02139, USA tomp@mit.edu

a2 Department of Aerospace Engineering & Engineering Mechanics, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA

Abstract

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.

(Received December 13 2007)

(Revised May 14 2008)

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