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Closed-loop separation control: An analytic approach M.-R. Alam, W. Liu,a
 

Summary: Closed-loop separation control: An analytic approach
M.-R. Alam, W. Liu,a
and G. Hallerb
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue,
Cambridge, Massachusetts 02139
Received 1 June 2005; accepted 22 February 2006; published online 3 April 2006
We develop an analytic approach to two-dimensional flow separation control by feedback. With two
wall-based actuators enclosing an array of distributed wall-shear sensors, we control the wall-shear
evolution equation through its boundary values at the actuators. Using this approach, we induce
separation at prescribed locations in steady and unsteady channel flows, and reduce the recirculation
length behind a backward-facing step to a prescribed value. 2006 American Institute of Physics.
DOI: 10.1063/1.2188267
I. INTRODUCTION
Separation control alters the location and extent of flow
detachment from a no-slip boundary to increase lift, improve
pressure recovery, or reduce drag. Modern approaches focus
on exciting large-scale coherent structures in the flow
through flaps, synthetic jets, plasma actuators, speakers, or
other devices see Greenblatt and Wygnanski1
for a compre-

  

Source: Alam, Mohammad-Reza - Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT)

 

Collections: Engineering