Control of mixing in 2D jet flow

We design a control law to improve jet flowing mixing. The control law uses a pair of actuators at the jet nozzle exit acting on the shear layers near the corners by blowing or subtracting fluid in an anti-symmetric fashion and a sensor at the nozzle exit measuring the pressure difference across the nozzle diameter. A 2D jet flow is numerically simulated along with massless/mass particles and passive scalar. The mixing enhancement produced by these controllers is demonstrated visually by snapshots of vorticity plot, streaklines, particle distribution and scalar field. A probability density function of particles and scalar is constructed, and serves as a measure of mixing quality and the effectiveness of the controllers. This closed-loop control law successfully alters the jet flow and improves the mixing quality using a pressure sensor at a location of seemingly low observability.