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《力学学报：英文版》
>THREE-DIMENSIONAL EVOLUTIION OF VORTICES AND EARLY FEATURES OF COHERENT STRUCTURE IN THE TURBULENT WAKE BEHIND A 2-D CIRCULAR CYLINDER
THREE-DIMENSIONAL EVOLUTIION OF VORTICES AND EARLY FEATURES OF COHERENT STRUCTURE IN THE TURBULENT WAKE BEHIND A 2-D CIRCULAR CYLINDER
3-D evolution of Karman vortex filaments and vortex filaments inbraid regions in the turbulent wake of a 2-D circulax cylinder is investigated numeri-cally based on inviscid vortex dynamics by analyzing the response of the initially 2-Dspanwise vortex filaments to periodic spanwise disturbance of varying magnitude,wavelength and initial phase angles. Our results reveal a kind of 3-D vortex systemin the wake which consists of large scale horseshoe-shaped vortices and small scaleλ-shaped vortex filaments as well as vortex loops. The mechanism and the dynamicprocess about the generation of streamwise vortical structure and the 3-D coherentstructure are reported.
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