SUBHARMONIC LOCK-IN AND PHASE SYNCHRONIZATON IN KARMAN STREET DUE TO SURFACE WAVES etc15 Tracking Number 217Presentation: Session: Control 2 Room: Room D Session start: 15:00 Tue 25 Aug 2015 Hans GUNNOO hans.gunnoo@unicaen.fr Affifliation: Nizar ABCHA nizar.abcha@unicaen.fr Affifliation: Isabel GARCIA-HERMOSA maria-isabel.garcia-hermosa@unicaen.fr Affifliation: Alexander Ezersky Alexander.Ezersky@unicaen.fr Affifliation: Topics: - Control of turbulent flows, - Vortex dynamics and structure formation, - Jets and wakes Abstract: It is experimentally shown that the action of harmonic surface waves on the turbulent Karman vortex street can provide the shedding frequency lock-in. In our experimental conditions, this effect occurs if the frequency of the surface wave is approximately two times higher than the frequency of vortex shedding. The dynamics of phase fluctuations in the vortex wake of the cylinder is studied using the Hilbert transform technique. On the plane wave frequency – wave amplitude we find an area where phase synchronization of oscillations in the vortex wake occurs. |