Computational Fluid Dynamics and Aeroacoustics
Large Eddy Simulation (LES)
Turbulent jet / wake vortex interaction
Turbulent jet / wake vortex interaction. Video: 3,3 Mo
In the near field of an aircraft wake, the exhaust jets of the turbines are entrained into two counter-rotating wingtip vortices, which at the same time roll up from the sheet of vorticity induced by the wings. To understand the complex process of the entrainment and the mixing of a turbulent jet in the wake, represented by a Lamb-Oseen vortex, a temporal large eddy simulation of the interaction between a turbulent jet and a wake vortex was carried out by solving the compressible Navier-Stokes equations at Mach number 0.2 and a Reynolds number of 5000. The axes of the jet and the vortex are sufficiently well separated not to interact immediately, the vortex velocity causes the jet to be pulled around the vortex, the core of which is not altered. Then, when the jet is close enough to the vortex, its axial speed interacts with the vortex tangential velocity, causing the appearance of three-dimensional structures of azimuthal vorticity around it. The jet is progressively eliminated and the vortex recovers its initial shape.
