Accession Number:

ADA495394

Title:

Nonlinear Dynamics and Control of Three-Dimensional Separated Flows

Descriptive Note:

Final rept. 1 Jan 2006-30 Nov 2008

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2009-02-28

Pagination or Media Count:

6.0

Abstract:

Our objective in this project was to derive a mathematically exact theory of unsteady fluid flow separation. We have obtained analytic formulae for the location and shape of separation profiles in terms of measurable, wall-based physical quantities. These formulae can now be used to design feedback controllers that alter, destroy, or create separation. Our main achievements are as follows 1 We have developed a mathematical theory of unsteady three-dimensional separation for flows with a steady mean component. 2 We have developed a theory of moving unsteady separation for flows with a time-varying mean component. 3 We have developed a theory of separation for two-dimensional flows with a slip boundary 1-3 above cover no-slip boundaries 4 We also conducted experiments to prove existence of a new three-dimensional separation pattern separation along a limit cycle of the wall shear field first predicted by our 3D steady separation theory.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE