The Repulse effect repulses a particle around a region, but is different than the Bounce node as it is repelled before it physically hits the region.

Repulse Properties

Parameter Description
Name Lets you rename the node.

An on/off switch using binary code. 1 = on, 0 = off.

Magnitude This value should be between 0 and 2. The higher the value, the more drastically the particles will be repulsed.
Look Ahead Determines how far ahead of the particle's current position to see whether there's an obstacle coming. This value should be between 0 and 100.
Epsilon Affects how quickly the effect of the repulse wears off. The smaller the number, the longer the effect lasts. This value should be between 0.1 and 0.0001.