22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-2.10.4

ACTIVE FLOW CONTROL OVER A CIRCULAR CYLINDER

C. Nae
INCAS – National Institute for Aerospace Research, Romania

Keywords: flow control, cfd, automatic differentiation, optimization

The flow control problem is considered using microjet actuators and an optimization algorithm applied for a cost function defined as a boundary integral on the reference shape surface. The numerical approach is based on an unsteady optimization process involving a RANS flow solver, a numerical model for the actuators and a global unsteady optimization algorithm, based on the BFGS. The actuators are controlled as to minimize the cost function using gradients provided by the use of an automatic differentiation tool applied to the source code of the flow solver. Results are presented for the numerical simulation of the actuator and the flow around the circular cylinder using one apriori given control law and for active flow control using synthetic jet actuators.

view full paper