Nonlinear optimal control of bypass transition using a receding horizon approach

TL;DR

This paper develops a receding horizon optimal control method for bypass transition in boundary layer flows, effectively reducing flow energy and drag through targeted wall actuation, with insights into the control mechanisms involved.

Contribution

It introduces a receding horizon approach combined with adjoint equations for nonlinear optimal control of bypass transition, enabling long-term control application and downstream effect analysis.

Findings

Mean drag reduction of 55% in control region

Flow energy initially reduced then increased downstream

Control mechanism counteracts high speed streaks and turbulent spots

Abstract

We consider the nonlinear optimal control of bypass transition in a boundary layer flow subjected to a pair of free stream vortical perturbations using a receding horizon approach. The optimal control problem is solved using the Lagrange variational technique that results in a set of adjoint equations, used to obtain the optimal wall actuation (blowing and suction from a control slot located in the transition region). The receding horizon approach enables the application of control action over a longer time period, and allows the extraction of time-averaged statistics as well as investigation of the control effect downstream of the control slot. The results show that the controlled flow energy is initially reduced in the streamwise direction and then increased because transition still occurs. The distribution of the optimal control velocity responds to the flow activity above and upstream of the control slot. The control effect propagates downstream of the slot and the flow energy is reduced up to the exit of the computational domain. The mean drag reduction is 55% and 10% in the control region and downstream of the slot, respectively. The control mechanism is investigated by examining the second order statistics and the two-point correlations. It is found that in the upstream (left) side of the slot, the controller counteracts the near wall high speed streaks and reduces the turbulent shear stress; this is akin to opposition control in channel flow, and since the time-average control velocity is positive, it is more similar to blowing-only opposition control. In the downstream (right) side of the slot, the controller reacts to the impingement of turbulent spots that have been produced upstream and inside the boundary layer (top-bottom mechanism). The control velocity is positive and increases in the streamwise direction, and the flow behavior is similar to that of uniform blowing.