Application of optimal control theory for the re-stabilization of open flows: dream or reality?
Event details
| Date | 21.05.2010 |
| Hour | 10:15 |
| Speaker | Prof. F. Gallaire, Laboratoire de mécanique des fluides et instabilités, EPFL Lausanne, Switzerland. |
| Location |
MEC2405
|
| Category | Conferences - Seminars |
Flow control refers to the ability to alter flows with the aim to achieve a desired effect; examples
include drag reduction or noise attenuation among many other industrial applications. All these
flow phenomena are associated with a strong flow unsteadiness that can be viewed as the
nonlinear development of an initially linear instability of the underlying laminar flow. Feedback
control appears as a natural candidate to quench these incipient instabilities at their earliest
stages.
In this presentation, we will first discuss how the transient and asymptotic linear flow dynamics
can be determined by means of iterative algorithms for giant eigenvalue problems, which result
from the discretization of the linearized governing equations of fluid dynamics. As a typical
example, detached boundary layer flows will be considered. We will then discuss several model
reduction techniques that yield low-order linear state-space representations amenable to LQG
control and estimation. The effect of the feedback-control loop onto the neglected dynamics
will be illustrated a posteriori on several flow cases.
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Practical information
- General public
- Free