Compressible Navier-Stokes Equations - Synchronization of a Pipe-Pipe System

Mutual interaction of the jets (oscillating air sheets) of two organ pipes P1 (left) and P2 (right). The jets act via the radiated spherical sound waves (external coupling) generated by the sound generation regimes jet-resonator inside the organ pipes (internal coupling). Shown is the turbulent kinetic energy k which is scaled logarithmically. Numerical simulation, done with OpenFOAM 2.2., is calculated fully compressible, using a LES-one-equation-model for the sub-grid scales. Reynolds number: Re~2000-10000. Mesh size: (L x W x H) 400mm x 10mm x 300mm. Grid points ~. The mutual coupling leads to synchronization of the pipe-pipe system after t=20ms. The whole setup of the mesh is shown at