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RealFlow's noise functions create a pattern that is repeated over time. With 0 the noise pattern remains constant during simulation. With higher settings, the noise pattern will change faster, but it will also be repeated in shorter cycles.
Bounded
A bounded “Noise Field” is restricted to a sphere, which is displayed in the viewport around the node’s centre. You can also change the shape’s size with the "Scale" parameters of the → "Node" panel or the R key.