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We perform numerical simulation of quantum turbulence at zero temperaturegenerated by an oscillating sphere. In this simulation, we injected vortices onthe sphere to generate turbulence. Although we prepare injected vortex loops ofidentical length, they are extended by the oscillating sphere to form a tanglethrough numerous reconnections. The resulting tangle around the sphere isanisotropic and affected by the oscillation. The vortex tangle continues toemit vortex loops, which leave the sphere. The statistics of emitted loopsdiffer significantly from those of the original injected vortices. First, thesizes of the emitted loops are widely distributed, ranging from smaller to muchlarger than the size of the initial injected loop. Second, the propagationdirection of the emitted loops exhibits anisotropy: Small loops move awayalmost isotropically but large ones do so anisotropically along the oscillationdirection of the sphere. Thus, the oscillating object stirs the initialinjected vortices to reproduce a group of vortices with different statistics.Such physics is compared with the experiments of vibrating objects.

Statistics of vortex loops emitted from quantum turbulence driven by an oscillating sphere