Compressible Navier-Stokes Equations - (Auto)-Synchronization of an jet via external acoustic field

Interaction of an jet (oscillating air sheet) with its own time-delayed sound signal, reflected by a convex, acoustically hard wall in front of the pipe. Left: the pressure p, right the turbulent kinetic energy k. Simulation (2D), done with OpenFOAM 2.1. is calculated fully compressible, using a LES-one-equation-model for the sub-grid scales. Reynolds number: Re~2000-10000, mesh size: (w x h) 180mm x 200mm, grid points ~260 000.