Our group investigates physical mechanisms in a wide array of aerospace systems.  Current interests range from jet aeroacoustics of single, merging and impinging jets, flow-structure interaction noise in jet nozzles, turbofans and rotorcrafts, design of acoustic liners for engine nacelles and afterburners using novel acoustic metamaterials, the role of hydrodynamic instability in configurations such as jet and boundary layer transitions, pipe flows, swirling flows in combustors and others.  A range of numerical and theoretical tools are used including large-eddy simulations, solvers for physics-based lower-order models and other analytical techniques that exploit complex analytical properties of Fourier-transformed quantities.  In collaboration with other investigators, we sometimes use experimental setups too for our research that include jet facilities in wind tunnels and anechoic chambers.