The Vortex space warp applies a force to particle systems, spinning them through a whirling vortex, and then moving them down a long, thin spout or vortex well. Vortex is useful for creating black holes, whirlpools, tornadoes, and other funnel-like objects.
The space warp settings let you control the vortex shape, the well characteristics, and rate and range of particle capture. The shape of the vortex is also affected by particle system settings, such as speed.