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- S. S. Ravindran
- SIAM J. Scientific Computing
- 2002

- L. S. Hou, S. S. Ravindran
- SIAM J. Scientific Computing
- 1999

- Kazufumi Ito, S. S. Ravindran
- SIAM J. Scientific Computing
- 1998

We examine the optimal control of stationary thermally convected uid ows from the theoretical and numerical point of view. We use thermal convection as control mechanism, that is, control is eeected through the temperature on part of the boundary. Control problems are formulated as constrained minimization problem. Existence of optimal control is given and… (More)

- S. S. Ravindran
- 1999

Designing an aircraft without conventional control surfaces is of interest to aerospace community. In this direction, smart actuator devices such as synthetic jets have been proposed to provide aircraft maneuverability instead of control surfaces. In this article, a numerical study is performed to investigate the e ects of unsteady suction and blowing on… (More)

- S. S. Ravindran
- J. Sci. Comput.
- 2000

In this article, we present a reduced order modeling approach suitable for active control of uid dynamical systems based on proper orthogonal decomposition (POD). The rationale behind the reduced order modeling is that numerical simulation of Navier-Stokes equations is still too costly for the purpose of optimization and control of unsteady ows. We examine… (More)

This paper is concerned with optimal control problems for a Ginzburg-Landau model of superconductivity that is valid for high values of the Ginzburg-Landau parameter and high external fields. The control is of Neumann type. We first show that optimal solutions exist. We then show that Lagrange multipliers may be used to enforce the constraints and derive an… (More)

- S. S. RAVINDRAN
- 2007

In this paper, we consider the stabilization of steady state solutions to Navier-Stokes equations by boundary feedback control. The feedback control is determined by solving a linear quadratic regulator problem associated with the linearized Navier-Stokes equations. The control is effected through suction and blowing at the boundary. We show that the linear… (More)

- S. S. Ravindran
- SIAM J. Scientific Computing
- 2005

The flow of weakly electrically conducting fluids can be controlled by electromagnetic forces originating from electrodes and permanent magnets. We consider the possibility of separation control for an electrically conducting bluff body flow with reduced-order modeling. The reducedorder model is derived using the proper orthogonal decomposition (POD) and… (More)

- K Ito, S S Ravindran
- 1996

This article presents a reduced order method for simulation and control of uid ows. The major advantage of this method over others such as nite element, nite diierence or spectral method is that it has fewer degrees of freedom. The present methodology's feasibility for ow control is demonstrated on two boundary control problems. The rst one is a velocity… (More)