**Radial falloff:** This setting defines how the flow reduces away from the fan axis.

*Constant*- The flow does not depend on the distance from the axis.*Linear*- The flow decreases to zero at the outer fan edge at a constant speed.*Quadric*- The flow speed is defined by a 2nd order parabola: speed = k*d*d, where d is distance from the outer edge towards the axis. This kind of flow appears in real world water pipes.

**Axis falloff:** Defines how rapidly the flow decreases in the direction of the fan axis. The falloff is symmetric in front of and behind the fan.

*Constant*- The flow does not depend on the distance measured along the fan axis.*Linear*- The flow is inversely proportional to the distance: flow = maxflow/(c+k*distance)

Note | |
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The actual flow speed and other fluid properties can be defined from the Physics tab of the property window. |