CFD-based adaptive flow control using ARMARKOV disturbance rejection

In this paper we demonstrate adaptive flow control for an incompressible viscous fluid through a two-dimensional channel without the use of an analytical model. An adaptive disturbance rejection algorithm is implemented within a CFD simulation to reduce the effects of an unknown velocity disturbance on the performance variable z, which is the transverse velocity component of the flow at a downstream location. The algorithm requires minimal knowledge of the system, specifically, the numerator coefficients of the transfer function from the control input to the performance variable. System identification, based on CFD simulations prior to the disturbance rejection simulations, is used to identify the required parameters.